Vineet Gupta 4749ffdfbb ARC: show_regs: lockdep: avoid page allocator... ... [ Upstream commit ab6c03676c ] and use smaller/on-stack buffer instead The motivation for this change was lockdep splat like below. | potentially unexpected fatal signal 11. | BUG: sleeping function called from invalid context at ../mm/page_alloc.c:4317 | in_atomic(): 1, irqs_disabled(): 0, pid: 57, name: segv | no locks held by segv/57. | Preemption disabled at: | [<8182f17e>] get_signal+0x4a6/0x7c4 | CPU: 0 PID: 57 Comm: segv Not tainted 4.17.0+ #23 | | Stack Trace: | arc_unwind_core.constprop.1+0xd0/0xf4 | __might_sleep+0x1f6/0x234 | __get_free_pages+0x174/0xca0 | show_regs+0x22/0x330 | get_signal+0x4ac/0x7c4 # print_fatal_signals() -> preempt_disable() | do_signal+0x30/0x224 | resume_user_mode_begin+0x90/0xd8 So signal handling core calls show_regs() with preemption disabled but an ensuing GFP_KERNEL page allocator call is flagged by lockdep. We could have switched to GFP_NOWAIT, but turns out that is not enough anways and eliding page allocator call leads to less code and instruction traces to sift thru when debugging pesky crashes. FWIW, this patch doesn't cure the lockdep splat (which next patch does). Reviewed-by: William Kucharski <william.kucharski@oracle.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-03-05 17:58:48 +01:00
..
boot	ARC: dma [IOC]: mark DMA devices connected as dma-coherent	2018-08-31 12:47:26 -07:00
configs	arc: [devboards] Add support of NFSv3 ACL	2018-12-08 12:59:10 +01:00
include	ARC: fix __ffs return value to avoid build warnings	2019-03-05 17:58:48 +01:00
kernel	ARC: show_regs: lockdep: avoid page allocator...	2019-03-05 17:58:48 +01:00
lib	ARCv2: lib: memeset: fix doing prefetchw outside of buffer	2019-01-31 08:14:35 +01:00
mm	ARC: adjust memblock_reserve of kernel memory	2019-01-31 08:14:35 +01:00
oprofile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
plat-axs10x	ARC: [plat-axs103] refactor the quad core DT quirk code	2017-12-20 12:41:45 -08:00
plat-eznps	arc: [plat-eznps] fix printk warning in arc/plat-eznps/mtm.c	2018-07-30 11:48:49 -07:00
plat-hsdk	ARCv2: [plat-hsdk]: Save accl reg pair by default	2018-07-19 10:36:45 -07:00
plat-sim	ARC: [plat-sim] Include this platform unconditionally	2017-08-04 13:49:47 +05:30
plat-tb10x	arc: select GPIOLIB directly	2016-04-26 14:07:59 +02:00
Kbuild
Kconfig	clocksource/drivers/arc_timer: Utilize generic sched_clock	2019-01-09 17:38:42 +01:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Makefile	ARC: change defconfig defaults to ARCv2	2018-12-08 12:59:10 +01:00