Description of problem: 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).
Created attachment 335961 [details] Upstream patch http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=68df3755e383e6fecf2354a67b08f92f18536594
Development Management has reviewed and declined this request. You may appeal this decision by reopening this request.
(In reply to comment #4) > Development Management has reviewed and declined this request. You may appeal > this decision by reopening this request. Reopened the bug. See https://bugzilla.redhat.com/show_bug.cgi?id=491266#c5.