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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2017-04-18 16:12:56 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-04-19 10:59:47 +0300 |
| commit | 9b135b234644c9881eee4f5d5683da0f4524722f (patch) | |
| tree | 59bb5449bf33f8169ff07c298bec0a4aacb0bfe5 /arch/x86/kernel/unwind_frame.c | |
| parent | e335bb51cc15e80ac180701a0d335ef1c050828e (diff) | |
| download | linux-9b135b234644c9881eee4f5d5683da0f4524722f.tar.xz | |
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>
Diffstat (limited to 'arch/x86/kernel/unwind_frame.c')
| -rw-r--r-- | arch/x86/kernel/unwind_frame.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/unwind_frame.c b/arch/x86/kernel/unwind_frame.c index c4611359b617..3ebe68770e60 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); } } |