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ARM: 7506/1: allow for ATAGS to be configured out when DT support is selected

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Now that ATAGS support is well contained, we can easily remove it from
the kernel build if so desired.  It has to explicitly be disabled, and
only when DT support is selected.

Note: disabling kernel ATAGS support does not prevent the usage of
CONFIG_ARM_ATAG_DTB_COMPAT.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2012-09-01 03:03:25 +01:00 committed by Russell King
parent aa783b6fd6
commit bd51e2f595
3 changed files with 33 additions and 9 deletions
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26
arch/arm/Kconfig
View File

@ -1891,12 +1891,6 @@ config CC_STACKPROTECTOR
neutralized via a kernel panic.
This feature requires gcc version 4.2 or above.
config DEPRECATED_PARAM_STRUCT
bool "Provide old way to pass kernel parameters"
help
This was deprecated in 2001 and announced to live on for 5 years.
Some old boot loaders still use this way.
endmenu
menu "Boot options"
@ -1909,6 +1903,23 @@ config USE_OF
help
Include support for flattened device tree machine descriptions.
config ATAGS
bool "Support for the traditional ATAGS boot data passing" if USE_OF
default y
help
This is the traditional way of passing data to the kernel at boot
time. If you are solely relying on the flattened device tree (or
the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
to remove ATAGS support from your kernel binary. If unsure,
leave this to y.
config DEPRECATED_PARAM_STRUCT
bool "Provide old way to pass kernel parameters"
depends on ATAGS
help
This was deprecated in 2001 and announced to live on for 5 years.
Some old boot loaders still use this way.
# Compressed boot loader in ROM. Yes, we really want to ask about
# TEXT and BSS so we preserve their values in the config files.
config ZBOOT_ROM_TEXT
@ -2035,6 +2046,7 @@ config CMDLINE
choice
prompt "Kernel command line type" if CMDLINE != ""
default CMDLINE_FROM_BOOTLOADER
depends on ATAGS
config CMDLINE_FROM_BOOTLOADER
bool "Use bootloader kernel arguments if available"
@ -2104,7 +2116,7 @@ config KEXEC
config ATAGS_PROC
bool "Export atags in procfs"
depends on KEXEC
depends on ATAGS && KEXEC
default y
help
Should the atags used to boot the kernel be exported in an "atags"

5
arch/arm/kernel/Makefile
View File

@ -15,10 +15,12 @@ CFLAGS_REMOVE_return_address.o = -pg
# Object file lists.
obj-y := atags_parse.o elf.o entry-armv.o entry-common.o irq.o opcodes.o \
obj-y := elf.o entry-armv.o entry-common.o irq.o opcodes.o \
process.o ptrace.o return_address.o sched_clock.o \
setup.o signal.o stacktrace.o sys_arm.o time.o traps.o
obj-$(CONFIG_ATAGS) += atags_parse.o
obj-$(CONFIG_ATAGS_PROC) += atags_proc.o
obj-$(CONFIG_DEPRECATED_PARAM_STRUCT) += atags_compat.o
obj-$(CONFIG_LEDS) += leds.o
@ -52,7 +54,6 @@ test-kprobes-objs += kprobes-test-thumb.o
else
test-kprobes-objs += kprobes-test-arm.o
endif
obj-$(CONFIG_ATAGS_PROC) += atags_proc.o
obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o
obj-$(CONFIG_ARM_THUMBEE) += thumbee.o
obj-$(CONFIG_KGDB) += kgdb.o

11
arch/arm/kernel/atags.h
View File

@ -5,4 +5,15 @@ static inline void save_atags(struct tag *tags) { }
#endif
void convert_to_tag_list(struct tag *tags);
#ifdef CONFIG_ATAGS
struct machine_desc *setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr);
#else
static inline struct machine_desc *
setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr)
{
early_print("no ATAGS support: can't continue\n");
while (true);
unreachable();
}
#endif