* Dave Jones <da...@codemonkey.org.uk> wrote:
> On Wed, May 25, 2016 at 03:58:10AM +0800, kernel test robot wrote:
>
> > 0day kernel testing robot got the below dmesg and the first bad commit is
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> >
> > commit 7b5e74e637e4a977c7cf40fd7de332f60b68180e
> > Author: Borislav Petkov <b...@suse.de>
> > AuthorDate: Tue Mar 29 17:41:54 2016 +0200
> > Commit: Ingo Molnar <mi...@kernel.org>
> > CommitDate: Thu Mar 31 13:33:17 2016 +0200
> >
> > x86/cpufeature: Remove cpu_has_arch_perfmon
> >
> > Use boot_cpu_has() instead.
>
> This seem an unlikely candidate given...
>
> > [ 1.914984] random: trinity urandom read with 25 bits of entropy
> available
> > [ 8.542178] random: nonblocking pool is initialized
> > [ 11.939833] sock: process `trinity-main' is using obsolete setsockopt
> SO_BSDCOMPAT
> > [ 12.349890] BUG: unable to handle kernel paging request at 6b636170
> > [ 12.349895] IP: [<c108154b>] perf_prepare_sample+0x7d/0x263
>
> The trace is more related to perf.
Also, 7b5e74e637e4a appears to be pretty much a provable NOP, it should not
change
a single byte in the kernel image, as it replaces a macro use:
-#define cpu_has_arch_perfmon boot_cpu_has(X86_FEATURE_ARCH_PERFMON)
... with open-coded expressions of the same.
Thanks,
Ingo
