| commit | 45948d7720e8bd0104696087c6305fdd90e3b298 | |
| author | Jan Beulich <jbeulich@novell.com> | |
| Sat, 25 Mar 2006 15:29:25 +0000 (25 16:29 +0100) | ||
| committer | Linus Torvalds <torvalds@g5.osdl.org> | |
| Sat, 25 Mar 2006 17:10:52 +0000 (25 09:10 -0800) | ||
| tree | 0da730feffeae60461117a07efdf2ada96704fa6 | treesnapshot (tar.gz zip) |
| parent | 2b514e74f4e59e3b8e54891580fef2c9ff6c7bd0 | commitdiff |
[PATCH] x86_64: save FPU context slightly later
Touching of the floating point state in a kernel debugger must be
NMI-safe, specifically math_state_restore() must be able to deal with
being called out of an NMI context. In order to do that reliably, the
context switch code must take care to not leave a window open where
the current task's TS_USEDFPU flag and CR0.TS could get out of sync.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Touching of the floating point state in a kernel debugger must be
NMI-safe, specifically math_state_restore() must be able to deal with
being called out of an NMI context. In order to do that reliably, the
context switch code must take care to not leave a window open where
the current task's TS_USEDFPU flag and CR0.TS could get out of sync.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| arch/x86_64/kernel/process.c | diffblobblamehistory |