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| author |   K.Prasad <prasad@linux.vnet.ibm.com> | 2010-01-28 16:44:15 +0530 |
|---|---|---|
| committer |   Frederic Weisbecker <fweisbec@gmail.com> | 2010-01-29 02:44:30 +0100 |
| commit | e0e53db6133c32964fd17f20b17073a402f07ed3 (patch) | |
| tree | 72daeb1abb53901a0c8c10cbff234b5c4f9521c0 /arch/x86/include/asm/perf_event.h | |
| parent | x86/debug: Clear reserved bits of DR6 in do_debug() (diff) | |
| download | linux-dev-e0e53db6133c32964fd17f20b17073a402f07ed3.tar.xz linux-dev-e0e53db6133c32964fd17f20b17073a402f07ed3.zip | |
x86/hw-breakpoints: Optimize return code from notifier chain in hw_breakpoint_handler
Processing of debug exceptions in do_debug() can stop if it
originated from a hw-breakpoint exception by returning NOTIFY_STOP
in most cases.
But for certain cases such as:
a) user-space breakpoints with pending SIGTRAP signal delivery (as
in the case of ptrace induced breakpoints).
b) exceptions due to other causes than breakpoints
We will continue to process the exception by returning NOTIFY_DONE.
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Roland McGrath <roland@redhat.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
LKML-Reference: <20100128111415.GC13935@in.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'arch/x86/include/asm/perf_event.h')
0 files changed, 0 insertions, 0 deletions