Vineet Gupta 9c41f4eeb9 ARC: Incorrect mm reference used in vmalloc fault handler ... A vmalloc fault needs to sync up PGD/PTE entry from init_mm to current task's "active_mm". ARC vmalloc fault handler however was using mm. A vmalloc fault for non user task context (actually pre-userland, from init thread's open for /dev/console) caused the handler to deref NULL mm (for mm->pgd) The reasons it worked so far is amazing: 1. By default (!SMP), vmalloc fault handler uses a cached value of PGD. In SMP that MMU register is repurposed hence need for mm pointer deref. 2. In pre-3.12 SMP kernel, the problem triggering vmalloc didn't exist in pre-userland code path - it was introduced with commit 20bafb3d23 "n_tty: Move buffers into n_tty_data" Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Gilad Ben-Yossef <gilad@benyossef.com> Cc: Noam Camus <noamc@ezchip.com> Cc: stable@vger.kernel.org #3.10 and 3.11 Cc: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-11-02 10:27:04 -07:00
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boot	ARC: Add some .gitignore entries	2013-08-26 09:40:24 +05:30
configs	Couple of Platform updates (Device Tree files primarily) given that the	2013-07-10 10:11:26 -07:00
include	ARC: Workaround spinlock livelock in SMP SystemC simulation	2013-09-27 16:28:48 +05:30
kernel	ARC: Ignore ptrace SETREGSET request for synthetic register "stop_pc"	2013-10-12 12:00:36 +05:30
lib	ARC: [lib] strchr breakage in Big-endian configuration	2013-08-24 11:24:53 -07:00
mm	ARC: Incorrect mm reference used in vmalloc fault handler	2013-11-02 10:27:04 -07:00
oprofile	ARC: OProfile support	2013-02-15 23:16:00 +05:30
plat-arcfpga	Couple of Platform updates (Device Tree files primarily) given that the	2013-07-10 10:11:26 -07:00
plat-tb10x	ARC: [TB10x] Updates for irqchip driver	2013-06-28 15:07:42 +05:30
Kbuild	ARC: Build system: Makefiles, Kconfig, Linker script	2013-02-11 20:00:25 +05:30
Kconfig	Remove GENERIC_HARDIRQ config option	2013-09-13 15:09:52 +02:00
Kconfig.debug	consolidate per-arch stack overflow debugging options	2013-07-04 11:25:39 -07:00
Makefile	ARC: Adjustments for gcc 4.8	2013-06-27 14:35:32 +05:30