rpms/kernel/F-10 add-fwrapv-to-cflags.patch, NONE, 1.1.2.1 kernel.spec, 1.1206.2.54, 1.1206.2.55
Kyle McMartin
kyle at fedoraproject.org
Fri Mar 20 17:04:39 UTC 2009
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Author: kyle
Update of /cvs/pkgs/rpms/kernel/F-10
In directory cvs1.fedora.phx.redhat.com:/tmp/cvs-serv12937
Modified Files:
Tag: private-fedora-10-2_6_27
kernel.spec
Added Files:
Tag: private-fedora-10-2_6_27
add-fwrapv-to-cflags.patch
Log Message:
* Fri Mar 20 2009 Kyle McMartin <kyle at redhat.com> 2.6.27.20-170.2.55
- add-fwrapv-to-cflags.patch: avoid gcc optimizing away wrapping arithmetic.
add-fwrapv-to-cflags.patch:
--- NEW FILE add-fwrapv-to-cflags.patch ---
Add '-fwrapv' to gcc CFLAGS
This makes sure that gcc doesn't try to optimize away wrapping
arithmetic, which the kernel occasionally uses for overflow testing, ie
things like
if (ptr + offset < ptr)
which technically is undefined for non-unsigned types. See
http://bugzilla.kernel.org/show_bug.cgi?id=12597
for details.
Not all versions of gcc support it, so we need to make it conditional
(it looks like it was introduced in gcc-3.4).
Reminded-by: Alan Cox <alan at lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
--- linux-2.6.27.noarch.orig/Makefile
+++ linux-2.6.27.noarch/Makefile
@@ -555,6 +555,9 @@ KBUILD_CFLAGS += $(call cc-option,-Wdecl
# disable pointer signed / unsigned warnings in gcc 4.0
KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
+# disable invalid "can't wrap" optimzations for signed / pointers
+KBUILD_CFLAGS += $(call cc-option,-fwrapv)
+
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
# But warn user when we do so
warn-assign = \
Index: kernel.spec
===================================================================
RCS file: /cvs/pkgs/rpms/kernel/F-10/kernel.spec,v
retrieving revision 1.1206.2.54
retrieving revision 1.1206.2.55
diff -u -r1.1206.2.54 -r1.1206.2.55
--- kernel.spec 19 Mar 2009 03:44:50 -0000 1.1206.2.54
+++ kernel.spec 20 Mar 2009 17:04:08 -0000 1.1206.2.55
@@ -781,6 +781,8 @@
# Fix up the v4l2 video_open function
Patch3140: linux-2.6.27-fix-video_open.patch
+Patch3200: add-fwrapv-to-cflags.patch
+
%endif
BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
@@ -1408,6 +1410,8 @@
ApplyPatch linux-2.6.27-fix-video_open.patch
+ApplyPatch add-fwrapv-to-cflags.patch
+
# END OF PATCH APPLICATIONS
%endif
@@ -1983,6 +1987,9 @@
%kernel_variant_files -k vmlinux %{with_kdump} kdump
%changelog
+* Fri Mar 20 2009 Kyle McMartin <kyle at redhat.com> 2.6.27.20-170.2.55
+- add-fwrapv-to-cflags.patch: avoid gcc optimizing away wrapping arithmetic.
+
* Wed Mar 18 2009 Chuck Ebbert <cebbert at redhat.com> 2.6.27.20-170.2.54
- Add Dell Vostro to i8042 nomux quirk list (#490250)
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