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| author | Paul Mackerras <paulus@samba.org> | 2010-06-29 12:50:32 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2010-06-30 13:54:58 +1000 |
| commit | d09ec7387184eba9e3030496f0451204090ff610 (patch) | |
| tree | c3a6f251bf695a20009d1cd3f0d7a9115fdb3018 /arch | |
| parent | 76b0f1337690d223811c852ad3a5078eb89276c5 (diff) | |
| download | op-kernel-dev-d09ec7387184eba9e3030496f0451204090ff610.zip op-kernel-dev-d09ec7387184eba9e3030496f0451204090ff610.tar.gz | |
powerpc, hw_breakpoint: Tell generic code we have no instruction breakpoints
At present, hw_breakpoint_slots() returns 1 regardless of what
type of breakpoint is specified in the type argument. Since we
don't define CONFIG_HAVE_MIXED_BREAKPOINTS_REGS, there are
separate values for TYPE_INST and TYPE_DATA, and hw_breakpoint_slots()
returns 1 for both, effectively advertising instruction breakpoint
support which doesn't exist.
This fixes it by making hw_breakpoint_slots return 1 for TYPE_DATA
and 0 for TYPE_INST. This moves hw_breakpoint_slots() from the
powerpc hw_breakpoint.h to hw_breakpoint.c because the definitions
of TYPE_INST and TYPE_DATA aren't available in <asm/hw_breakpoint.h>.
They are defined in <linux/hw_breakpoint.h> but we can't include
that header in <asm/hw_breakpoint.h>, and nor can we rely on
<linux/hw_breakpoint.h> being included before <asm/hw_breakpoint.h>.
Since hw_breakpoint_slots() is only called at boot time, there is
no performance impact from making it a real function rather than
a static inline.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/hw_breakpoint.h | 5 | ||||
| -rw-r--r-- | arch/powerpc/kernel/hw_breakpoint.c | 10 |
2 files changed, 11 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h index ea87f8a..1c33ec1 100644 --- a/arch/powerpc/include/asm/hw_breakpoint.h +++ b/arch/powerpc/include/asm/hw_breakpoint.h @@ -37,10 +37,6 @@ struct arch_hw_breakpoint { #include <asm/reg.h> #include <asm/system.h> -static inline int hw_breakpoint_slots(int type) -{ - return HBP_NUM; -} struct perf_event; struct pmu; struct perf_sample_data; @@ -49,6 +45,7 @@ struct perf_sample_data; /* Maximum permissible length of any HW Breakpoint */ #define HW_BREAKPOINT_LEN 0x8 +extern int hw_breakpoint_slots(int type); extern int arch_bp_generic_fields(int type, int *gen_bp_type); extern int arch_check_bp_in_kernelspace(struct perf_event *bp); extern int arch_validate_hwbkpt_settings(struct perf_event *bp); diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c index 5a1d55d..5ecd040 100644 --- a/arch/powerpc/kernel/hw_breakpoint.c +++ b/arch/powerpc/kernel/hw_breakpoint.c @@ -44,6 +44,16 @@ static DEFINE_PER_CPU(struct perf_event *, bp_per_reg); /* + * Returns total number of data or instruction breakpoints available. + */ +int hw_breakpoint_slots(int type) +{ + if (type == TYPE_DATA) + return HBP_NUM; + return 0; /* no instruction breakpoints available */ +} + +/* * Install a perf counter breakpoint. * * We seek a free debug address register and use it for this |
