summaryrefslogtreecommitdiffstats
path: root/mm/backing-dev.c
diff options
context:
space:
mode:
authorJosh Poimboeuf <jpoimboe@redhat.com>2018-01-11 21:46:24 +0000
committerThomas Gleixner <tglx@linutronix.de>2018-01-12 00:14:28 +0100
commit258c76059cece01bebae098e81bacb1af2edad17 (patch)
tree1d3bdfe76ad0064b40cdacda35edc7d194f288c8 /mm/backing-dev.c
parent39b735332cb8b33a27c28592d969e4016c86c3ea (diff)
downloadblackbird-op-linux-258c76059cece01bebae098e81bacb1af2edad17.tar.gz
blackbird-op-linux-258c76059cece01bebae098e81bacb1af2edad17.zip
objtool: Allow alternatives to be ignored
Getting objtool to understand retpolines is going to be a bit of a challenge. For now, take advantage of the fact that retpolines are patched in with alternatives. Just read the original (sane) non-alternative instruction, and ignore the patched-in retpoline. This allows objtool to understand the control flow *around* the retpoline, even if it can't yet follow what's inside. This means the ORC unwinder will fail to unwind from inside a retpoline, but will work fine otherwise. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: gnomes@lxorguk.ukuu.org.uk Cc: Rik van Riel <riel@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: thomas.lendacky@amd.com Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Jiri Kosina <jikos@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Kees Cook <keescook@google.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org> Cc: Paul Turner <pjt@google.com> Link: https://lkml.kernel.org/r/1515707194-20531-3-git-send-email-dwmw@amazon.co.uk
Diffstat (limited to 'mm/backing-dev.c')
0 files changed, 0 insertions, 0 deletions
OpenPOWER on IntegriCloud