x86: Make is_64bit_mm() widely available
authorDave Hansen <dave.hansen@linux.intel.com>
Sun, 7 Jun 2015 18:37:04 +0000 (11:37 -0700)
committerIngo Molnar <mingo@kernel.org>
Tue, 9 Jun 2015 10:24:32 +0000 (12:24 +0200)
commitb0e9b09b3bd64e67bba862e238d3757b2482b6de
tree8f5129ba0ba7e23bd4d913388885cd49c57045f6
parentcd4996dce18b619bd7b3acf75c91f49c77f05a97
x86: Make is_64bit_mm() widely available

The uprobes code has a nice helper, is_64bit_mm(), that consults
both the runtime and compile-time flags for 32-bit support.
Instead of reinventing the wheel, pull it in to an x86 header so
we can use it for MPX.

I prefer passing the 'mm' around to test_thread_flag(TIF_IA32)
because it makes it explicit where the context is coming from.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150607183704.F0209999@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/mmu_context.h
arch/x86/kernel/uprobes.c