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x86/unwind: Disable unwinder warnings on 32-bit

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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 <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: LKP <lkp@01.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/a69658760800bf281e6353248c23e0fa0acf5230.1507597785.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf 2017-10-09 20:20:05 -05:00 committed by Ingo Molnar
parent 99bd28a49b
commit d4a2d031dd
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kernel/unwind_frame.c
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@ -355,6 +355,13 @@ bool unwind_next_frame(struct unwind_state *state)
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",