diff options
| author |   bibo mao <bibo.mao@intel.com> | 2006-07-28 14:44:48 +0200 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-28 19:28:00 -0700 |
| commit | a4045dff782a8692637c24a0222120082c887caa (patch) | |
| tree | 67f4fe2bb6975bce2887c295752c7612896130f9 /scripts/patch-kernel | |
| parent | [PATCH] x86_64: Don't clobber r8-r11 in int 0x80 handler (diff) | |
[PATCH] x86_64: Enlarge debug stack for nested kprobes
In x86_64 platform, INT1 and INT3 trap stack is IST stack called DEBUG_STACK,
when INT1/INT3 trap happens, system will switch to DEBUG_STACK by hardware.
Current DEBUG_STACK size is 4K, when int1/int3 trap happens, kernel will
minus current DEBUG_STACK IST value by 4k. But if int3/int1 trap is nested,
it will destroy other vector's IST stack. This patch modifies this, it sets
DEBUG_STACK size as 8K and allows two level of nested int1/int3 trap.
Kprobe DEBUG_STACK may be nested, because kprobe handler may be probed
by other kprobes.
Thanks jbeulich for pointing out error in the first patch.
[AK: nested kprobes are pretty dubious. Hopefully one nest
will be enough. This will cost 8K per CPU (4K more than before)]
Signed-off-by: bibo, mao <bibo.mao@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'scripts/patch-kernel')
0 files changed, 0 insertions, 0 deletions