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
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alignment.c	arch/unicore32/mm/alignment.c: include "asm/pgtable.h" to avoid compiling error	2014-06-20 08:22:38 +08:00
cache-ucv2.S	unicore32 core architecture: mm related: consistent device DMA handling	2011-03-17 09:19:09 +08:00
dma-swiotlb.c	Unicore32: adapt for dma_map_ops changes	2012-03-28 16:36:39 +02:00
extable.c	unicore32 core architecture: mm related: fault handling	2011-03-17 09:19:09 +08:00
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.c	Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]	2012-03-28 18:30:03 +01:00
init.c	mm, show_mem: remove SHOW_MEM_FILTER_PAGE_COUNT	2014-01-21 16:19:44 -08:00
ioremap.c	arch/unicore32/mm/ioremap.c: return NULL on invalid pfn	2014-06-04 16:53:53 -07:00
Kconfig	unicore32 core architecture: mm related: generic codes	2011-03-17 09:19:08 +08:00
Makefile	unicore32: replace unicore32-specific iomap functions with generic lib implementation	2011-03-17 09:19:21 +08:00
mm.h	Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]	2012-03-28 18:30:03 +01:00
mmu.c	reboot: unicore32: prepare reboot_mode for moving to generic kernel code	2013-07-09 10:33:29 -07:00
pgd.c	mm: fix false-positive warning on exit due mm_nr_pmds(mm)	2015-02-11 17:06:04 -08:00
proc-macros.S	unicore32 core architecture: processor and system headers	2011-03-17 09:19:06 +08:00
proc-syms.c	arch: unicore32: ksyms: export '__cpuc_coherent_kern_range' to avoid compiling failure	2014-06-20 08:22:41 +08:00
proc-ucv2.S	unicore32 core architecture: processor and system headers	2011-03-17 09:19:06 +08:00
tlb-ucv2.S	unicore32 core architecture: mm related: consistent device DMA handling	2011-03-17 09:19:09 +08:00