Andrey Ryabinin c634d807d9 mm/kasan: get rid of speculative shadow checks ... For some unaligned memory accesses we have to check additional byte of the shadow memory. Currently we load that byte speculatively to have only single load + branch on the optimistic fast path. However, this approach has some downsides: - It's unaligned access, so this prevents porting KASAN on architectures which doesn't support unaligned accesses. - We have to map additional shadow page to prevent crash if speculative load happens near the end of the mapped memory. This would significantly complicate upcoming memory hotplug support. I wasn't able to notice any performance degradation with this patch. So these speculative loads is just a pain with no gain, let's remove them. Link: http://lkml.kernel.org/r/20170601162338.23540-1-aryabinin@virtuozzo.com Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Acked-by: Dmitry Vyukov <dvyukov@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-07-10 16:32:33 -07:00
..
kasan_init.c	mm/kasan/kasan_init.c: use kasan_zero_pud for p4d table	2017-07-10 16:32:33 -07:00
kasan.c	mm/kasan: get rid of speculative shadow checks	2017-07-10 16:32:33 -07:00
kasan.h	kasan: improve double-free report format	2017-05-03 15:52:12 -07:00
Makefile	mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB	2016-07-28 16:07:41 -07:00
quarantine.c	kasan: fix races in quarantine_remove_cache()	2017-03-09 17:01:10 -08:00
report.c	kasan: separate report parts by empty lines	2017-05-03 15:52:12 -07:00