Messages in this thread Patch in this message | | | Date | Wed, 19 Apr 2017 01:07:35 -0700 | From | tip-bot for Josh Poimboeuf <> | Subject | [tip:x86/asm] x86/unwind: Properly zero-pad 32-bit values in unwind_dump() |
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Commit-ID: 9b135b234644c9881eee4f5d5683da0f4524722f Gitweb: http://git.kernel.org/tip/9b135b234644c9881eee4f5d5683da0f4524722f Author: Josh Poimboeuf <jpoimboe@redhat.com> AuthorDate: Tue, 18 Apr 2017 08:12:56 -0500 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 19 Apr 2017 09:59:47 +0200
x86/unwind: Properly zero-pad 32-bit values in unwind_dump()
On x86-32, 32-bit stack values printed by unwind_dump() are confusingly zero-padded to 16 characters (64 bits):
unwind stack type:0 next_sp: (null) mask:a graph_idx:0 f50cdebc: 00000000f50cdec4 (0xf50cdec4) f50cdec0: 00000000c40489b7 (irq_exit+0x87/0xa0) ...
Instead, base the field width on the size of a long integer so that it looks right on both x86-32 and x86-64.
x86-32:
unwind stack type:1 next_sp: (null) mask:0x2 graph_idx:0 c0ee9d98: c0ee9de0 (init_thread_union+0x1de0/0x2000) c0ee9d9c: c043fd90 (__save_stack_trace+0x50/0xe0) ...
x86-64:
unwind stack type:1 next_sp: (null) mask:0x2 graph_idx:0 ffffffff81e03b88: ffffffff81e03c10 (init_thread_union+0x3c10/0x4000) ffffffff81e03b90: ffffffff81048f8e (__save_stack_trace+0x5e/0x100) ...
Reported-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> 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/36b743812e7eb291d74af4e5067736736622daad.1492520933.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/kernel/unwind_frame.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/unwind_frame.c b/arch/x86/kernel/unwind_frame.c index c461135..3ebe687 100644 --- a/arch/x86/kernel/unwind_frame.c +++ b/arch/x86/kernel/unwind_frame.c @@ -48,11 +48,13 @@ static void unwind_dump(struct unwind_state *state, unsigned long *sp) if (zero) { if (!prev_zero) - printk_deferred("%p: %016x ...\n", sp, 0); + printk_deferred("%p: %0*x ...\n", + sp, BITS_PER_LONG/4, 0); continue; } - printk_deferred("%p: %016lx (%pB)\n", sp, word, (void *)word); + printk_deferred("%p: %0*lx (%pB)\n", + sp, BITS_PER_LONG/4, word, (void *)word); } }
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