]> git.karo-electronics.de Git - linux-beck.git/commit
x86: Use correct byte-sized register constraint in __xchg_op()
authorJeremy Fitzhardinge <jeremy@goop.org>
Mon, 2 Apr 2012 23:15:33 +0000 (16:15 -0700)
committerH. Peter Anvin <hpa@zytor.com>
Fri, 6 Apr 2012 16:39:39 +0000 (09:39 -0700)
commit2ca052a3710fac208eee690faefdeb8bbd4586a1
treec05a7c607f6f1b7065834e43540a2514b5d9257b
parent46ed99d1b7c92920ce9e313152522847647aae4f
x86: Use correct byte-sized register constraint in __xchg_op()

x86-64 can access the low half of any register, but i386 can only do
it with a subset of registers.  'r' causes compilation failures on i386,
but 'q' expresses the constraint properly.

Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Link: http://lkml.kernel.org/r/4F7A3315.501@goop.org
Reported-by: Leigh Scott <leigh123linux@googlemail.com>
Tested-by: Thomas Reitmayr <treitmayr@devbase.at>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: <stable@vger.kernel.org> v3.3
arch/x86/include/asm/cmpxchg.h