On Thu, 6 Nov 2014 10:54:19 +0100 Maxime COQUELIN <maxime.coquelin@xxxxxx> wrote: > On some 32 bits architectures, including x86, GENMASK(31, 0) returns 0 > instead of the expected ~0UL. > > This is the same on some 64 bits architectures with GENMASK_ULL(63, 0). > > This is due to an overflow in the shift operand, 1 << 32 for GENMASK, > 1 << 64 for GENMASK_ULL. > > Fixes: 10ef6b0dffe404bcc54e94cb2ca1a5b18445a66b > Cc: <stable@xxxxxxxxxxxxxxx> #v3.13+ > Reported-by: Eric Paire <eric.paire@xxxxxx> > Suggested-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Maxime Coquelin <maxime.coquelin@xxxxxx> Why cc:stable? Does this bug cause some observed kernel misbehaviour? If so, please fully describe that in the changelog. This will help people to determine whether this patch might fix a bug they're observing, and will help them to decide whether they should backport this patch into their kernels. I'm assuming that Peter will be merging this patch. -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html