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| author | Tong Li <tong.n.li@intel.com> | 2006-02-03 12:04:09 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-03 17:32:04 +0100 |
| commit | 23332c2e9da16b717f18fd95bc90211a663aa6ee (patch) | |
| tree | 873e445688472fd1726c0e48113f63a585d03b39 /drivers | |
| parent | [PATCH] Fix some ucLinux breakage from the tty updates (diff) | |
| download | linux-23332c2e9da16b717f18fd95bc90211a663aa6ee.tar.xz linux-23332c2e9da16b717f18fd95bc90211a663aa6ee.zip | |
[PATCH] OProfile: fixed x86_64 incorrect kernel call graphs
Fix the problem in kernel 2.6.15.1 (and early versions) that OProfile on
x86_64 does not correctly collect the stack traces for kernel functions.
The original code in valid_kernel_stack() in arch/i386/oprofile/backtrace.c
assumes that the frame pointer (headaddr) should be greater than stack
(i.e., regs).
This assumption is wrong for x86_64 because NMIs in x86_64 use a seperate
stack different from the kernel stack. Therefore, the variable stack now
points to some location on the NMI stack, which turns out to be at a higher
address than the frame pointer (headaddr) on the kernel stack. The correct
comparison here should be between headaddr and regs->rsp for x86_64.
Signed-off-by: Tong Li <tong.n.li@intel.com>
Cc: John Levon <levon@movementarian.org>
Cc: Philippe Elie <phil.el@wanadoo.fr>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions