[tip:x86/asm] x86/unwind: Properly zero-pad 32-bit values in unwind_dump()

[tip-bot for Josh Poimboeuf]

Commit-ID:  9b135b234644c9881eee4f5d5683da0f4524722f
Gitweb:     http://git.kernel.org/tip/9b135b234644c9881eee4f5d5683da0f4524722f
Author:     Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
AuthorDate: Tue, 18 Apr 2017 08:12:56 -0500
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/36b743812e7eb291d74af4e5067736736622daad.1492520933.git.jpoimboe@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 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);
 	}
 }