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| author | Jason Wessel <jason.wessel@windriver.com> | 2010-11-05 01:33:01 +0300 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2010-11-12 16:51:55 +0300 |
| commit | 3c502e7a0255d82621ff25d60cc816624830497e (patch) | |
| tree | 1f30638f22ef9ed748fac1f73cb18169efe49ae7 /include | |
| parent | 6c0aca288e726405b01dacb12cac556454d34b2a (diff) | |
| download | linux-3c502e7a0255d82621ff25d60cc816624830497e.tar.xz | |
perf,hw_breakpoint: Initialize hardware api earlier
When using early debugging, the kernel does not initialize the
hw_breakpoint API early enough and causes the late initialization of
the kernel debugger to fail. The boot arguments are:
earlyprintk=vga ekgdboc=kbd kgdbwait
Then simply type "go" at the kdb prompt and boot. The kernel will
later emit the message:
kgdb: Could not allocate hwbreakpoints
And at that point the kernel debugger will cease to work correctly.
The solution is to initialize the hw_breakpoint at the same time that
all the other perf call backs are initialized instead of using a
core_initcall() initialization which happens well after the kernel
debugger can make use of hardware breakpoints.
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
CC: Frederic Weisbecker <fweisbec@gmail.com>
CC: Ingo Molnar <mingo@elte.hu>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4CD3396D.1090308@windriver.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hw_breakpoint.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h index a2d6ea49ec56..d1e55fed2c7d 100644 --- a/include/linux/hw_breakpoint.h +++ b/include/linux/hw_breakpoint.h @@ -33,6 +33,8 @@ enum bp_type_idx { #ifdef CONFIG_HAVE_HW_BREAKPOINT +extern int __init init_hw_breakpoint(void); + static inline void hw_breakpoint_init(struct perf_event_attr *attr) { memset(attr, 0, sizeof(*attr)); @@ -108,6 +110,8 @@ static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp) #else /* !CONFIG_HAVE_HW_BREAKPOINT */ +static inline int __init init_hw_breakpoint(void) { return 0; } + static inline struct perf_event * register_user_hw_breakpoint(struct perf_event_attr *attr, perf_overflow_handler_t triggered, |