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[PATCH] x86-64: reduce x86-64 bug frame by 4 bytes

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As mentioned before, the size of the bug frame can be further reduced while
continuing to use instructions to encode the information.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich
2005-09-12 18:49:25 +02:00
committed by Linus Torvalds
parent c47a3167d0
commit 049cdefe19
2 changed files with 8 additions and 10 deletions
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8
arch/x86_64/kernel/traps.c
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@@ -321,13 +321,13 @@ void handle_BUG(struct pt_regs *regs)
if (__copy_from_user(&f, (struct bug_frame *) regs->rip,
sizeof(struct bug_frame)))
return;
if ((unsigned long)f.filename < __PAGE_OFFSET ||
if (f.filename >= 0 ||
f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
return;
if (__get_user(tmp, f.filename))
f.filename = "unmapped filename";
if (__get_user(tmp, (char *)(long)f.filename))
f.filename = (int)(long)"unmapped filename";
printk("----------- [cut here ] --------- [please bite here ] ---------\n");
printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", f.filename, f.line);
printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", (char *)(long)f.filename, f.line);
}
#ifdef CONFIG_BUG