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
..
configs	[IA64] refresh arch/ia64/configs/* using "make savedefconfig"	2014-09-23 11:09:29 -07:00
dig	Disintegrate asm/system.h for IA64	2012-03-28 18:30:02 +01:00
hp	ACPI / ia64 / sba_iommu: Restore the working initialization ordering	2014-06-16 22:33:20 +02:00
include	This is the final removal (after several years!) of the obsolete cpus_*	2015-04-20 10:19:03 -07:00
kernel	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2015-04-26 17:22:07 -07:00
lib	Fix common misspellings	2011-03-31 11:26:23 -03:00
mm	mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler	2015-05-19 08:39:15 +02:00
oprofile	Disintegrate asm/system.h for IA64	2012-03-28 18:30:02 +01:00
pci	ia64/PCI: Treat all host bridge Address Space Descriptors (even consumers) as windows	2015-04-21 15:29:39 -05:00
scripts	scripts: change scripts to use system python instead of env	2010-02-02 14:33:56 +01:00
sn	PCI: Assign resources before drivers claim devices (pci_scan_root_bus())	2015-03-19 10:17:13 -05:00
uv	ia64: change to new flag variables	2011-03-17 14:02:56 +01:00
install.sh	kbuild: use INSTALLKERNEL to select customized installkernel script	2009-09-20 12:18:14 +02:00
Kconfig	Initial ACPI support for arm64:	2015-04-24 08:23:45 -07:00
Kconfig.debug
Makefile	KVM: ia64: remove	2014-11-20 11:08:33 +01:00
module.lds