Ralf Baechle cf5b2d23a7 MIPS: oprofile: Fix BUG due to smp_processor_id() in preemptible code. ... current_cpu_type() is not preemption-safe. If CONFIG_PREEMPT is enabled then mipsxx_reg_setup() can be called from preemptible state. Added get_cpu()/put_cpu() pair to make it preemption-safe. This was found while testing oprofile with CONFIG_DEBUG_PREEMPT enable. /usr/zntestsuite # opcontrol --init /usr/zntestsuite # opcontrol --setup --event=L2_CACHE_ACCESSES:500 --event=L2_CACHE_MISSES:500 --no-vmlinux /usr/zntestsuite # opcontrol --start Using 2.6+ OProfile kernel interface. BUG: using smp_processor_id() in preemptible [00000000] code: oprofiled/1362 caller is mipsxx_reg_setup+0x11c/0x164 CPU: 0 PID: 1362 Comm: oprofiled Not tainted 3.10.4 #18 Stack : 00000006 70757465 00000000 00000000 00000000 00000000 80b173f6 00000037 80b10000 00000000 80b21614 88f5a220 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 89c49c00 89c49c2c 80721254 807b7927 8012c1d0 80b10000 80721254 00000000 00000552 88f5a220 80b1335c 807b78e6 89c49ba8 ... Call Trace: [<801099a4>] show_stack+0x64/0x7c [<80665520>] dump_stack+0x20/0x2c [<803a2250>] debug_smp_processor_id+0xe0/0xf0 [<8052df24>] mipsxx_reg_setup+0x11c/0x164 [<8052cd70>] op_mips_setup+0x24/0x4c [<80529cfc>] oprofile_setup+0x5c/0x12c [<8052b9f8>] event_buffer_open+0x78/0xf8 [<801c3150>] do_dentry_open.isra.15+0x2b8/0x3b0 [<801c3270>] finish_open+0x28/0x4c [<801d49b8>] do_last.isra.41+0x2cc/0xd00 [<801d54a0>] path_openat+0xb4/0x4c4 [<801d5c44>] do_filp_open+0x3c/0xac [<801c4744>] do_sys_open+0x110/0x1f4 [<8010f47c>] stack_done+0x20/0x44 Bug reported and original patch by Jerin Jacob <jerinjacobk@gmail.com>. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Jerin Jacob <jerinjacobk@gmail.com>		2013-08-05 13:34:22 +02:00
..
alchemy	MIPS: Idle: Consolidate all declarations in <asm/idle.h>.	2013-05-22 01:34:27 +02:00
ar7	MIPS: FW: Remove obsolete header file for MTI platforms.	2013-05-08 12:30:10 +02:00
ath79	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
bcm47xx	MIPS: Set default CPU type for BCM47XX platforms	2013-07-30 18:48:50 +02:00
bcm63xx	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2013-07-13 14:52:21 -07:00
boot	MIPS: Boot: Compressed: Remove -fstack-protector from CFLAGS	2013-07-01 15:10:41 +02:00
cavium-octeon	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2013-07-19 15:10:01 -07:00
cobalt	MIPS: Idle: Consolidate all declarations in <asm/idle.h>.	2013-05-22 01:34:27 +02:00
configs	MIPS: Update cavium_octeon_defconfig	2013-07-01 15:10:55 +02:00
dec	MIPS: DEC: remove unbuildable promcon.c	2013-06-18 00:31:29 +02:00
emma	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
fw	MIPS: sibyte: Declare the cfe_write() buffer as constant	2013-06-21 18:07:02 +02:00
include	MIPS: oprofile: Fix BUG due to smp_processor_id() in preemptible code.	2013-08-05 13:34:22 +02:00
jazz	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2013-03-02 07:44:16 -08:00
jz4740	MIPS: jz4740: Correct clock gate bit for DMA controller	2013-07-05 11:40:53 +05:30
kernel	MIPS: BMIPS: fix slave CPU booting when physical CPU is not 0	2013-07-30 18:54:29 +02:00
kvm	MIPS: kvm: Kconfig: Drop HAVE_KVM dependency from VIRTUALIZATION	2013-07-19 12:45:57 +02:00
lantiq	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
lasat	mips: lasat: sysctl: Convert use of typedef ctl_table to struct ctl_table	2013-06-18 00:31:32 +02:00
lib	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
loongson	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2013-07-13 14:52:21 -07:00
loongson1	MIPS: Idle: Consolidate all declarations in <asm/idle.h>.	2013-05-22 01:34:27 +02:00
math-emu	MIPS: Don't try to decode microMIPS branch instructions where they cannot exist.	2013-07-01 15:10:57 +02:00
mm	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2013-07-19 15:10:01 -07:00
mti-malta	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
mti-sead3	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
netlogic	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2013-07-19 15:10:01 -07:00
oprofile	MIPS: oprofile: Fix BUG due to smp_processor_id() in preemptible code.	2013-08-05 13:34:22 +02:00
pci	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
pmcs-msp71xx	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
pnx833x	MIPS: PNX833x: PNX8335_PCI_ETHERNET_INT depends on CONFIG_SOC_PNX8335	2013-08-05 13:34:22 +02:00
power	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
powertv	MIPS: powertv: Fix arguments for free_reserved_area()	2013-07-30 18:50:31 +02:00
ralink	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
rb532	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
sgi-ip22	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
sgi-ip27	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
sgi-ip32	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
sibyte	MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code	2013-07-14 19:36:51 -04:00
sni	MIPS: SNI: pcit: Fix build error with CONFIG_PCI=n disabled.	2013-06-25 17:10:28 +02:00
txx9	net: pass info struct via netdevice notifier	2013-05-28 13:11:01 -07:00
vr41xx	MIPS: Idle: Consolidate all declarations in <asm/idle.h>.	2013-05-22 01:34:27 +02:00
Kbuild	KVM/MIPS32: Infrastructure/build files.	2013-05-08 03:55:34 +02:00
Kbuild.platforms	MIPS: Delete Wind River ppmc eval board support.	2013-07-01 15:10:53 +02:00
Kconfig	MIPS: Set default CPU type for BCM47XX platforms	2013-07-30 18:48:50 +02:00
Kconfig.debug	consolidate per-arch stack overflow debugging options	2013-07-04 11:25:39 -07:00
Makefile	MIPS: initial stack protector support	2013-07-01 15:10:48 +02:00