x86/mpx: Support 32-bit binaries on 64-bit kernels
authorDave Hansen <dave.hansen@linux.intel.com>
Sun, 7 Jun 2015 18:37:05 +0000 (11:37 -0700)
committerIngo Molnar <mingo@kernel.org>
Tue, 9 Jun 2015 10:24:34 +0000 (12:24 +0200)
commit613fcb7d3c79ec25b5913a6aa974c9047c31e68c
treecf4b979e9bf8a951a63eb71ddcd536508148e05e
parent6ac52bb4913eadfa327138b91aab5d37234a2c3b
x86/mpx: Support 32-bit binaries on 64-bit kernels

Right now, the kernel can only switch between 64-bit and 32-bit
binaries at compile time. This patch adds support for 32-bit
binaries on 64-bit kernels when we support ia32 emulation.

We essentially choose which set of table sizes to use when doing
arithmetic for the bounds table calculations.

This also uses a different approach for calculating the table
indexes than before.  I think the new one makes it much more
clear what is going on, and allows us to share more code between
the 32-bit and 64-bit cases.

Based-on-patch-by: Qiaowei Ren <qiaowei.ren@intel.com>
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: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150607183705.E01F21E2@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/mpx.h
arch/x86/mm/mpx.c