David Hildenbrand 70ffdb9393 mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler ... Introduce faulthandler_disabled() and use it to check for irq context and disabled pagefaults (via pagefault_disable()) in the pagefault handlers. Please note that we keep the in_atomic() checks in place - to detect whether in irq context (in which case preemption is always properly disabled). In contrast, preempt_disable() should never be used to disable pagefaults. With !CONFIG_PREEMPT_COUNT, preempt_disable() doesn't modify the preempt counter, and therefore the result of in_atomic() differs. We validate that condition by using might_fault() checks when calling might_sleep(). Therefore, add a comment to faulthandler_disabled(), describing why this is needed. faulthandler_disabled() and pagefault_disable() are defined in linux/uaccess.h, so let's properly add that include to all relevant files. This patch is based on a patch from Thomas Gleixner. Reviewed-and-tested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-7-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-05-19 08:39:15 +02:00
..
alignment.c
asids-debugfs.c	arch/sh/mm/asids-debugfs.c: use PTR_ERR_OR_ZERO	2014-08-06 18:01:12 -07:00
cache-debugfs.c
cache-sh2.c
cache-sh2a.c
cache-sh3.c
cache-sh4.c
cache-sh5.c
cache-sh7705.c
cache-shx3.c
cache.c	flush_icache_range: export symbol to fix build errors	2014-08-29 16:28:17 -07:00
consistent.c
extable_32.c
extable_64.c
fault.c	mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler	2015-05-19 08:39:15 +02:00
flush-sh4.c
gup.c	Tighten rules for ACCESS_ONCE	2015-02-14 10:54:28 -08:00
hugetlbpage.c	mm/hugetlb: reduce arch dependent code around follow_huge_*	2015-02-11 17:06:01 -08:00
init.c	memory-hotplug: sh: suitable memory should go to ZONE_MOVABLE	2014-08-06 18:01:21 -07:00
ioremap_fixed.c
ioremap.c
Kconfig
kmap.c
Makefile
mmap.c
nommu.c
numa.c	sh: off by one BUG_ON() in setup_bootmem_node()	2014-12-10 17:41:02 -08:00
pgtable.c
pmb.c
sram.c
tlb-debugfs.c
tlb-pteaex.c
tlb-sh3.c
tlb-sh4.c
tlb-sh5.c
tlb-urb.c
tlbex_32.c
tlbex_64.c
tlbflush_32.c
tlbflush_64.c
uncached.c