Backport fixes for correct register constraints in cmpxchg.h (rhbz 809014)

kernel.spec

@@ -62,7 +62,7 @@ Summary: The Linux kernel
 # For non-released -rc kernels, this will be appended after the rcX and
 # gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
 #
-%global baserelease 3
+%global baserelease 4
 %global fedora_build %{baserelease}
 
 # base_sublevel is the kernel version we're starting with and patching
@@ -742,6 +742,10 @@ Patch21360: uvcvideo-Fix-race-induced-crash-in-uvc_video_clock_update.patch
 #rhbz 806676 807632
 Patch21385: libata-disable-runtime-pm-for-hotpluggable-port.patch
 
+#rhbz 809014
+Patch21390: x86-Use-correct-byte-sized-register-constraint-in-__xchg_op.patch
+Patch21391: x86-Use-correct-byte-sized-register-constraint-in-__add.patch
+
 Patch21400: unhandled-irqs-switch-to-polling.patch
 
 Patch22000: weird-root-dentry-name-debug.patch
@@ -1444,6 +1448,10 @@ ApplyPatch uvcvideo-Fix-race-induced-crash-in-uvc_video_clock_update.patch
 #rhbz 806676 807632
 ApplyPatch libata-disable-runtime-pm-for-hotpluggable-port.patch
 
+#rhbz 809014
+ApplyPatch x86-Use-correct-byte-sized-register-constraint-in-__xchg_op.patch
+ApplyPatch x86-Use-correct-byte-sized-register-constraint-in-__add.patch
+
 # END OF PATCH APPLICATIONS
 
 %endif
@@ -2299,6 +2307,9 @@ fi
 #                 ||----w |
 #                 ||     ||
 %changelog
+* Tue Apr 10 2012 Josh Boyer <jwboyer@redhat.com>
+- Backport fixes for correct register constraints in cmpxchg.h (rhbz 809014)
+
 * Mon Apr 09 2012 Justin M. Forbes <jforbes@redhat.com> - 3.4.0-0.rc2.git0.3
 - Reenable debugging options.
 

x86-Use-correct-byte-sized-register-constraint-in-__add.patch

@@ -0,0 +1,35 @@
+From: H. Peter Anvin <hpa@zytor.com>
+Date: Fri, 6 Apr 2012 16:30:57 +0000 (-0700)
+Subject: x86: Use correct byte-sized register constraint in __add()
+X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftip%2Ftip.git;a=commitdiff_plain;h=8c91c5325e107ec17e40a59a47c6517387d64eb7
+
+x86: Use correct byte-sized register constraint in __add()
+
+Similar to:
+
+ 2ca052a x86: Use correct byte-sized register constraint in __xchg_op()
+
+... the __add() macro also needs to use a "q" constraint in the
+byte-sized case, lest we try to generate an illegal register.
+
+Link: http://lkml.kernel.org/r/4F7A3315.501@goop.org
+Signed-off-by: H. Peter Anvin <hpa@zytor.com>
+Cc: Jeremy Fitzhardinge <jeremy@goop.org>
+Cc: Leigh Scott <leigh123linux@googlemail.com>
+Cc: Thomas Reitmayr <treitmayr@devbase.at>
+Cc: <stable@vger.kernel.org> v3.3
+---
+
+diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h
+index bc18d0e..99480e5 100644
+--- a/arch/x86/include/asm/cmpxchg.h
++++ b/arch/x86/include/asm/cmpxchg.h
+@@ -173,7 +173,7 @@ extern void __add_wrong_size(void)
+ 		switch (sizeof(*(ptr))) {				\
+ 		case __X86_CASE_B:					\
+ 			asm volatile (lock "addb %b1, %0\n"		\
+-				      : "+m" (*(ptr)) : "ri" (inc)	\
++				      : "+m" (*(ptr)) : "qi" (inc)	\
+ 				      : "memory", "cc");		\
+ 			break;						\
+ 		case __X86_CASE_W:					\

x86-Use-correct-byte-sized-register-constraint-in-__xchg_op.patch

@@ -0,0 +1,32 @@
+From: Jeremy Fitzhardinge <jeremy@goop.org>
+Date: Mon, 2 Apr 2012 23:15:33 +0000 (-0700)
+Subject: x86: Use correct byte-sized register constraint in __xchg_op()
+X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftip%2Ftip.git;a=commitdiff_plain;h=2ca052a3710fac208eee690faefdeb8bbd4586a1
+
+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
+---
+
+diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h
+index b3b7332..bc18d0e 100644
+--- a/arch/x86/include/asm/cmpxchg.h
++++ b/arch/x86/include/asm/cmpxchg.h
+@@ -43,7 +43,7 @@ extern void __add_wrong_size(void)
+ 		switch (sizeof(*(ptr))) {				\
+ 		case __X86_CASE_B:					\
+ 			asm volatile (lock #op "b %b0, %1\n"		\
+-				      : "+r" (__ret), "+m" (*(ptr))	\
++				      : "+q" (__ret), "+m" (*(ptr))	\
+ 				      : : "memory", "cc");		\
+ 			break;						\
+ 		case __X86_CASE_W:					\