x86: Add an inlined __copy_from_user_nmi() variant
authorAndi Kleen <ak@linux.intel.com>
Thu, 22 Oct 2015 22:07:20 +0000 (15:07 -0700)
committerIngo Molnar <mingo@kernel.org>
Mon, 23 Nov 2015 08:58:24 +0000 (09:58 +0100)
commit10013ebb5d7856c243541870f4e62fed68253e88
treecdbb1182419f3dc05b3414a2abcca9f59d7c1268
parent8c2accc8ca0be9cd8119ca439038243dfc8fcd0d
x86: Add an inlined __copy_from_user_nmi() variant

Add a inlined __ variant of copy_from_user_nmi. The inlined variant allows
the user to:

 - batch the access_ok() check for multiple accesses

 - avoid having a pagefault_disable/enable() on every access if the
   caller already ensures disabled page faults due to its context.

 - get all the optimizations in copy_*_user() for small constant sized
   transfers

It is just a define to __copy_from_user_inatomic().

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1445551641-13379-1-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/uaccess.h