Commit-ID: d4a2d031dd42f9594107d317e2a9a0c6d73ad46b Gitweb: https://git.kernel.org/tip/d4a2d031dd42f9594107d317e2a9a0c6d73ad46b Author: Josh Poimboeuf <[email protected]> AuthorDate: Mon, 9 Oct 2017 20:20:05 -0500 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 10 Oct 2017 12:49:49 +0200
x86/unwind: Disable unwinder warnings on 32-bit x86-32 doesn't have stack validation, so in most cases it doesn't make sense to warn about bad frame pointers. Reported-by: Tetsuo Handa <[email protected]> Signed-off-by: Josh Poimboeuf <[email protected]> Cc: Byungchul Park <[email protected]> Cc: Fengguang Wu <[email protected]> Cc: LKP <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/a69658760800bf281e6353248c23e0fa0acf5230.1507597785.git.jpoim...@redhat.com Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/kernel/unwind_frame.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kernel/unwind_frame.c b/arch/x86/kernel/unwind_frame.c index 81aca07..3dc26f9 100644 --- a/arch/x86/kernel/unwind_frame.c +++ b/arch/x86/kernel/unwind_frame.c @@ -355,6 +355,13 @@ bad_address: state->regs->sp < (unsigned long)task_pt_regs(state->task)) goto the_end; + /* + * There are some known frame pointer issues on 32-bit. Disable + * unwinder warnings on 32-bit until it gets objtool support. + */ + if (IS_ENABLED(CONFIG_X86_32)) + goto the_end; + if (state->regs) { printk_deferred_once(KERN_WARNING "WARNING: kernel stack regs at %p in %s:%d has bad 'bp' value %p\n",
