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42a0bb3f71
printk() takes some locks and could not be used a safe way in NMI
context.
The chance of a deadlock is real especially when printing stacks from
all CPUs. This particular problem has been addressed on x86 by the
commit a9edc88093 ("x86/nmi: Perform a safe NMI stack trace on all
CPUs").
The patchset brings two big advantages. First, it makes the NMI
backtraces safe on all architectures for free. Second, it makes all NMI
messages almost safe on all architectures (the temporary buffer is
limited. We still should keep the number of messages in NMI context at
minimum).
Note that there already are several messages printed in NMI context:
WARN_ON(in_nmi()), BUG_ON(in_nmi()), anything being printed out from MCE
handlers. These are not easy to avoid.
This patch reuses most of the code and makes it generic. It is useful
for all messages and architectures that support NMI.
The alternative printk_func is set when entering and is reseted when
leaving NMI context. It queues IRQ work to copy the messages into the
main ring buffer in a safe context.
__printk_nmi_flush() copies all available messages and reset the buffer.
Then we could use a simple cmpxchg operations to get synchronized with
writers. There is also used a spinlock to get synchronized with other
flushers.
We do not longer use seq_buf because it depends on external lock. It
would be hard to make all supported operations safe for a lockless use.
It would be confusing and error prone to make only some operations safe.
The code is put into separate printk/nmi.c as suggested by Steven
Rostedt. It needs a per-CPU buffer and is compiled only on
architectures that call nmi_enter(). This is achieved by the new
HAVE_NMI Kconfig flag.
The are MN10300 and Xtensa architectures. We need to clean up NMI
handling there first. Let's do it separately.
The patch is heavily based on the draft from Peter Zijlstra, see
https://lkml.org/lkml/2015/6/10/327
[arnd@arndb.de: printk-nmi: use %zu format string for size_t]
[akpm@linux-foundation.org: min_t->min - all types are size_t here]
Signed-off-by: Petr Mladek <pmladek@suse.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Jan Kara <jack@suse.cz>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> [arm part]
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jiri Kosina <jkosina@suse.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: David Miller <davem@davemloft.net>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
591 lines
14 KiB
Plaintext
591 lines
14 KiB
Plaintext
config MMU
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bool
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default y
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config ZONE_DMA
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bool
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default y
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config RWSEM_GENERIC_SPINLOCK
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bool
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default y
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config RWSEM_XCHGADD_ALGORITHM
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bool
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config ARCH_HAS_ILOG2_U32
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bool
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default n
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config ARCH_HAS_ILOG2_U64
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bool
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default n
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config GENERIC_HWEIGHT
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bool
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default y
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config NO_IOPORT_MAP
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def_bool y
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config FORCE_MAX_ZONEORDER
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int
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default 6
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config TRACE_IRQFLAGS_SUPPORT
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depends on ETRAX_ARCH_V32
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def_bool y
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config STACKTRACE_SUPPORT
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def_bool y
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config LOCKDEP_SUPPORT
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depends on ETRAX_ARCH_V32
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def_bool y
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config CRIS
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bool
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default y
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select HAVE_IDE
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select GENERIC_ATOMIC64
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select HAVE_UID16
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select VIRT_TO_BUS
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select ARCH_WANT_IPC_PARSE_VERSION
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select GENERIC_IRQ_SHOW
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select GENERIC_IOMAP
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select MODULES_USE_ELF_RELA
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select CLONE_BACKWARDS2
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select HAVE_EXIT_THREAD if ETRAX_ARCH_V32
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select OLD_SIGSUSPEND
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select OLD_SIGACTION
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select GPIOLIB
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select IRQ_DOMAIN if ETRAX_ARCH_V32
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select OF if ETRAX_ARCH_V32
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select OF_EARLY_FLATTREE if ETRAX_ARCH_V32
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select CLKSRC_MMIO if ETRAX_ARCH_V32
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select GENERIC_CLOCKEVENTS if ETRAX_ARCH_V32
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select GENERIC_SCHED_CLOCK if ETRAX_ARCH_V32
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select HAVE_DEBUG_BUGVERBOSE if ETRAX_ARCH_V32
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select HAVE_NMI
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config HZ
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int
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default 100
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config NR_CPUS
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int
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default "1"
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config BUILTIN_DTB
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string "DTB to build into the kernel image"
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depends on OF
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source "init/Kconfig"
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source "kernel/Kconfig.freezer"
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menu "General setup"
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source "fs/Kconfig.binfmt"
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config ETRAX_CMDLINE
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string "Kernel command line"
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default "root=/dev/mtdblock3"
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help
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Pass additional commands to the kernel.
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config ETRAX_WATCHDOG
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bool "Enable ETRAX watchdog"
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help
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Enable the built-in watchdog timer support on ETRAX based embedded
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network computers.
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config ETRAX_WATCHDOG_NICE_DOGGY
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bool "Disable watchdog during Oops printouts"
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depends on ETRAX_WATCHDOG
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help
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By enabling this you make sure that the watchdog does not bite while
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printing oopses. Recommended for development systems but not for
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production releases.
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config ETRAX_FAST_TIMER
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bool "Enable ETRAX fast timer API"
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help
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This options enables the API to a fast timer implementation using
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timer1 to get sub jiffie resolution timers (primarily one-shot
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timers).
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This is needed if CONFIG_ETRAX_SERIAL_FAST_TIMER is enabled.
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config ETRAX_KMALLOCED_MODULES
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bool "Enable module allocation with kmalloc"
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help
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Enable module allocation with kmalloc instead of vmalloc.
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source "kernel/Kconfig.preempt"
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source mm/Kconfig
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endmenu
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menu "Hardware setup"
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choice
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prompt "Processor type"
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default ETRAX100LX
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config ETRAX100LX
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bool "ETRAX-100LX-v1"
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select ARCH_USES_GETTIMEOFFSET
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help
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Support version 1 of the ETRAX 100LX.
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config ETRAX100LX_V2
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bool "ETRAX-100LX-v2"
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select ARCH_USES_GETTIMEOFFSET
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help
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Support version 2 of the ETRAX 100LX.
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config ETRAXFS
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bool "ETRAX-FS-V32"
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help
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Support CRIS V32.
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config CRIS_MACH_ARTPEC3
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bool "ARTPEC-3"
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help
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Support Axis ARTPEC-3.
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endchoice
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config ETRAX_ARCH_V10
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bool
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default y if ETRAX100LX || ETRAX100LX_V2
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default n if !(ETRAX100LX || ETRAX100LX_V2)
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select TTY
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config ETRAX_ARCH_V32
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bool
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default y if (ETRAXFS || CRIS_MACH_ARTPEC3)
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default n if !(ETRAXFS || CRIS_MACH_ARTPEC3)
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config ETRAX_DRAM_SIZE
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int "DRAM size (dec, in MB)"
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default "8"
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help
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Size of DRAM (decimal in MB) typically 2, 8 or 16.
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config ETRAX_VMEM_SIZE
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int "Video memory size (dec, in MB)"
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depends on ETRAX_ARCH_V32 && !ETRAXFS
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default 8 if !ETRAXFS
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help
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Size of Video accessible memory (decimal, in MB).
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config ETRAX_FLASH_BUSWIDTH
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int "Buswidth of NOR flash in bytes"
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default "2"
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help
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Width in bytes of the NOR Flash bus (1, 2 or 4). Is usually 2.
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config ETRAX_FLASH1_SIZE
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int "FLASH1 size (dec, in MB. 0 = Unknown)"
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default "0"
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choice
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prompt "Product debug-port"
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default ETRAX_DEBUG_PORT0
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config ETRAX_DEBUG_PORT0
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bool "Serial-0"
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help
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Choose a serial port for the ETRAX debug console. Default to
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port 0.
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config ETRAX_DEBUG_PORT1
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bool "Serial-1"
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help
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Use serial port 1 for the console.
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config ETRAX_DEBUG_PORT2
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bool "Serial-2"
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help
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Use serial port 2 for the console.
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config ETRAX_DEBUG_PORT3
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bool "Serial-3"
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help
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Use serial port 3 for the console.
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config ETRAX_DEBUG_PORT_NULL
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bool "disabled"
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help
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Disable serial-port debugging.
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endchoice
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choice
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prompt "Kernel GDB port"
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depends on ETRAX_KGDB
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default ETRAX_KGDB_PORT0
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help
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Choose a serial port for kernel debugging. NOTE: This port should
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not be enabled under Drivers for built-in interfaces (as it has its
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own initialization code) and should not be the same as the debug port.
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config ETRAX_KGDB_PORT0
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bool "Serial-0"
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help
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Use serial port 0 for kernel debugging.
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config ETRAX_KGDB_PORT1
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bool "Serial-1"
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help
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Use serial port 1 for kernel debugging.
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config ETRAX_KGDB_PORT2
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bool "Serial-2"
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help
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Use serial port 2 for kernel debugging.
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config ETRAX_KGDB_PORT3
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bool "Serial-3"
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help
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Use serial port 3 for kernel debugging.
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endchoice
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source arch/cris/arch-v10/Kconfig
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source arch/cris/arch-v32/Kconfig
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endmenu
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source "net/Kconfig"
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# bring in ETRAX built-in drivers
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menu "Drivers for built-in interfaces"
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source arch/cris/arch-v10/drivers/Kconfig
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source arch/cris/arch-v32/drivers/Kconfig
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config ETRAX_AXISFLASHMAP
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bool "Axis flash-map support"
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select MTD
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select MTD_CFI
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select MTD_CFI_AMDSTD
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select MTD_JEDECPROBE if ETRAX_ARCH_V32
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select MTD_BLOCK
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select MTD_COMPLEX_MAPPINGS
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help
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This option enables MTD mapping of flash devices. Needed to use
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flash memories. If unsure, say Y.
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config ETRAX_SYNCHRONOUS_SERIAL
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bool "Synchronous serial-port support"
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help
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Select this to enable the synchronous serial port driver.
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config ETRAX_SYNCHRONOUS_SERIAL_PORT0
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bool "Synchronous serial port 0 enabled"
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depends on ETRAX_SYNCHRONOUS_SERIAL
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help
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Enabled synchronous serial port 0.
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config ETRAX_SYNCHRONOUS_SERIAL0_DMA
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bool "Enable DMA on synchronous serial port 0."
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depends on ETRAX_SYNCHRONOUS_SERIAL_PORT0
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help
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A synchronous serial port can run in manual or DMA mode.
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Selecting this option will make it run in DMA mode.
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config ETRAX_SYNCHRONOUS_SERIAL_PORT1
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bool "Synchronous serial port 1 enabled"
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depends on ETRAX_SYNCHRONOUS_SERIAL && (ETRAXFS || ETRAX_ARCH_V10)
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help
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Enabled synchronous serial port 1.
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config ETRAX_SYNCHRONOUS_SERIAL1_DMA
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bool "Enable DMA on synchronous serial port 1."
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depends on ETRAX_SYNCHRONOUS_SERIAL_PORT1
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help
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A synchronous serial port can run in manual or DMA mode.
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Selecting this option will make it run in DMA mode.
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choice
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prompt "Network LED behavior"
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depends on ETRAX_ETHERNET
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default ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY
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config ETRAX_NETWORK_LED_ON_WHEN_LINK
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bool "LED_on_when_link"
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help
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Selecting LED_on_when_link will light the LED when there is a
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connection and will flash off when there is activity.
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Selecting LED_on_when_activity will light the LED only when
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there is activity.
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This setting will also affect the behaviour of other activity LEDs
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e.g. Bluetooth.
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config ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY
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bool "LED_on_when_activity"
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help
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Selecting LED_on_when_link will light the LED when there is a
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connection and will flash off when there is activity.
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Selecting LED_on_when_activity will light the LED only when
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there is activity.
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This setting will also affect the behaviour of other activity LEDs
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e.g. Bluetooth.
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endchoice
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choice
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prompt "Ser0 DMA out channel"
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depends on ETRAX_SERIAL_PORT0
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default ETRAX_SERIAL_PORT0_DMA6_OUT if ETRAX_ARCH_V32
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default ETRAX_SERIAL_PORT0_NO_DMA_OUT if ETRAX_ARCH_V10
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config ETRAX_SERIAL_PORT0_NO_DMA_OUT
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bool "Ser0 uses no DMA for output"
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help
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Do not use DMA for ser0 output.
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config ETRAX_SERIAL_PORT0_DMA6_OUT
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bool "Ser0 uses DMA6 for output"
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depends on ETRAXFS
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help
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Enables the DMA6 output channel for ser0 (ttyS0).
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If you do not enable DMA, an interrupt for each character will be
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used when transmitting data.
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Normally you want to use DMA, unless you use the DMA channel for
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something else.
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config ETRAX_SERIAL_PORT0_DMA0_OUT
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bool "Ser0 uses DMA0 for output"
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depends on CRIS_MACH_ARTPEC3
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help
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Enables the DMA0 output channel for ser0 (ttyS0).
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If you do not enable DMA, an interrupt for each character will be
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used when transmitting data.
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Normally you want to use DMA, unless you use the DMA channel for
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something else.
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endchoice
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choice
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prompt "Ser0 DMA in channel "
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depends on ETRAX_SERIAL_PORT0
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default ETRAX_SERIAL_PORT0_NO_DMA_IN if ETRAX_ARCH_V32
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default ETRAX_SERIAL_PORT0_DMA7_IN if ETRAX_ARCH_V10
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help
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What DMA channel to use for ser0.
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config ETRAX_SERIAL_PORT0_NO_DMA_IN
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bool "Ser0 uses no DMA for input"
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help
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Do not use DMA for ser0 input.
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config ETRAX_SERIAL_PORT0_DMA7_IN
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bool "Ser0 uses DMA7 for input"
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depends on ETRAXFS
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help
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Enables the DMA7 input channel for ser0 (ttyS0).
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If you do not enable DMA, an interrupt for each character will be
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used when receiving data.
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Normally you want to use DMA, unless you use the DMA channel for
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something else.
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config ETRAX_SERIAL_PORT0_DMA1_IN
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bool "Ser0 uses DMA1 for input"
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depends on CRIS_MACH_ARTPEC3
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help
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Enables the DMA1 input channel for ser0 (ttyS0).
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If you do not enable DMA, an interrupt for each character will be
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used when receiving data.
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Normally you want to use DMA, unless you use the DMA channel for
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something else.
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endchoice
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choice
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prompt "Ser1 DMA in channel "
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depends on ETRAX_SERIAL_PORT1
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default ETRAX_SERIAL_PORT1_NO_DMA_IN if ETRAX_ARCH_V32
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default ETRAX_SERIAL_PORT1_DMA9_IN if ETRAX_ARCH_V10
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help
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What DMA channel to use for ser1.
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config ETRAX_SERIAL_PORT1_NO_DMA_IN
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bool "Ser1 uses no DMA for input"
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help
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Do not use DMA for ser1 input.
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config ETRAX_SERIAL_PORT1_DMA5_IN
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bool "Ser1 uses DMA5 for input"
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depends on ETRAX_ARCH_V32
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help
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Enables the DMA5 input channel for ser1 (ttyS1).
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If you do not enable DMA, an interrupt for each character will be
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used when receiving data.
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Normally you want this on, unless you use the DMA channel for
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something else.
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config ETRAX_SERIAL_PORT1_DMA9_IN
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depends on ETRAX_ARCH_V10
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bool "Ser1 uses DMA9 for input"
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endchoice
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choice
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prompt "Ser1 DMA out channel"
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depends on ETRAX_SERIAL_PORT1
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default ETRAX_SERIAL_PORT1_NO_DMA_OUT if ETRAX_ARCH_V32
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default ETRAX_SERIAL_PORT1_DMA8_OUT if ETRAX_ARCH_V10
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help
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What DMA channel to use for ser1.
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config ETRAX_SERIAL_PORT1_NO_DMA_OUT
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bool "Ser1 uses no DMA for output"
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help
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Do not use DMA for ser1 output.
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config ETRAX_SERIAL_PORT1_DMA8_OUT
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depends on ETRAX_ARCH_V10
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bool "Ser1 uses DMA8 for output"
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config ETRAX_SERIAL_PORT1_DMA4_OUT
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depends on ETRAX_ARCH_V32
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bool "Ser1 uses DMA4 for output"
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help
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Enables the DMA4 output channel for ser1 (ttyS1).
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If you do not enable DMA, an interrupt for each character will be
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used when transmitting data.
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Normally you want this on, unless you use the DMA channel for
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something else.
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endchoice
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choice
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prompt "Ser2 DMA out channel"
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depends on ETRAX_SERIAL_PORT2
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default ETRAX_SERIAL_PORT2_NO_DMA_OUT if ETRAX_ARCH_V32
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default ETRAX_SERIAL_PORT2_DMA2_OUT if ETRAX_ARCH_V10
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config ETRAX_SERIAL_PORT2_NO_DMA_OUT
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bool "Ser2 uses no DMA for output"
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help
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Do not use DMA for ser2 output.
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config ETRAX_SERIAL_PORT2_DMA2_OUT
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bool "Ser2 uses DMA2 for output"
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depends on ETRAXFS || ETRAX_ARCH_V10
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help
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Enables the DMA2 output channel for ser2 (ttyS2).
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If you do not enable DMA, an interrupt for each character will be
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used when transmitting data.
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Normally you want to use DMA, unless you use the DMA channel for
|
|
something else.
|
|
|
|
config ETRAX_SERIAL_PORT2_DMA6_OUT
|
|
bool "Ser2 uses DMA6 for output"
|
|
depends on CRIS_MACH_ARTPEC3
|
|
help
|
|
Enables the DMA6 output channel for ser2 (ttyS2).
|
|
If you do not enable DMA, an interrupt for each character will be
|
|
used when transmitting data.
|
|
Normally you want to use DMA, unless you use the DMA channel for
|
|
something else.
|
|
|
|
endchoice
|
|
|
|
choice
|
|
prompt "Ser2 DMA in channel"
|
|
depends on ETRAX_SERIAL_PORT2
|
|
default ETRAX_SERIAL_PORT2_NO_DMA_IN if ETRAX_ARCH_V32
|
|
default ETRAX_SERIAL_PORT2_DMA3_IN if ETRAX_ARCH_V10
|
|
help
|
|
What DMA channel to use for ser2.
|
|
|
|
config ETRAX_SERIAL_PORT2_NO_DMA_IN
|
|
bool "Ser2 uses no DMA for input"
|
|
help
|
|
Do not use DMA for ser2 input.
|
|
|
|
config ETRAX_SERIAL_PORT2_DMA3_IN
|
|
bool "Ser2 uses DMA3 for input"
|
|
depends on ETRAXFS || ETRAX_ARCH_V10
|
|
help
|
|
Enables the DMA3 input channel for ser2 (ttyS2).
|
|
If you do not enable DMA, an interrupt for each character will be
|
|
used when receiving data.
|
|
Normally you want to use DMA, unless you use the DMA channel for
|
|
something else.
|
|
|
|
config ETRAX_SERIAL_PORT2_DMA7_IN
|
|
bool "Ser2 uses DMA7 for input"
|
|
depends on CRIS_MACH_ARTPEC3
|
|
help
|
|
Enables the DMA7 input channel for ser2 (ttyS2).
|
|
If you do not enable DMA, an interrupt for each character will be
|
|
used when receiving data.
|
|
Normally you want to use DMA, unless you use the DMA channel for
|
|
something else.
|
|
|
|
endchoice
|
|
|
|
choice
|
|
prompt "Ser3 DMA in channel"
|
|
depends on ETRAX_SERIAL_PORT3
|
|
default ETRAX_SERIAL_PORT3_NO_DMA_IN if ETRAX_ARCH_V32
|
|
default ETRAX_SERIAL_PORT3_DMA5_IN if ETRAX_ARCH_V10
|
|
help
|
|
What DMA channel to use for ser3.
|
|
|
|
config ETRAX_SERIAL_PORT3_NO_DMA_IN
|
|
bool "Ser3 uses no DMA for input"
|
|
help
|
|
Do not use DMA for ser3 input.
|
|
|
|
config ETRAX_SERIAL_PORT3_DMA5_IN
|
|
depends on ETRAX_ARCH_V10
|
|
bool "DMA 5"
|
|
|
|
endchoice
|
|
|
|
choice
|
|
prompt "Ser3 DMA out channel"
|
|
depends on ETRAX_SERIAL_PORT3
|
|
default ETRAX_SERIAL_PORT3_NO_DMA_OUT if ETRAX_ARCH_V32
|
|
default ETRAX_SERIAL_PORT3_DMA4_OUT if ETRAX_ARCH_V10
|
|
|
|
config ETRAX_SERIAL_PORT3_NO_DMA_OUT
|
|
bool "Ser3 uses no DMA for output"
|
|
help
|
|
Do not use DMA for ser3 output.
|
|
|
|
config ETRAX_SERIAL_PORT3_DMA4_OUT
|
|
depends on ETRAX_ARCH_V10
|
|
bool "DMA 4"
|
|
|
|
endchoice
|
|
|
|
endmenu
|
|
|
|
source "drivers/Kconfig"
|
|
|
|
source "fs/Kconfig"
|
|
|
|
source "arch/cris/Kconfig.debug"
|
|
|
|
source "security/Kconfig"
|
|
|
|
source "crypto/Kconfig"
|
|
|
|
source "lib/Kconfig"
|