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SubjectRe: [PATCH v2 07/16] powerpc/watchpoint: Get watchpoint count dynamically while disabling them
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Le 01/04/2020 à 08:13, Ravi Bangoria a écrit :
> Instead of disabling only one watchpoint, get num of available
> watchpoints dynamically and disable all of them.
>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
> ---
> arch/powerpc/include/asm/hw_breakpoint.h | 15 +++++++--------
> 1 file changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h
> index 4e4976c3248b..fae33c729ba9 100644
> --- a/arch/powerpc/include/asm/hw_breakpoint.h
> +++ b/arch/powerpc/include/asm/hw_breakpoint.h
> @@ -78,14 +78,13 @@ extern void ptrace_triggered(struct perf_event *bp,
> struct perf_sample_data *data, struct pt_regs *regs);
> static inline void hw_breakpoint_disable(void)
> {
> - struct arch_hw_breakpoint brk;
> -
> - brk.address = 0;
> - brk.type = 0;
> - brk.len = 0;
> - brk.hw_len = 0;
> - if (ppc_breakpoint_available())
> - __set_breakpoint(&brk, 0);
> + int i;
> + struct arch_hw_breakpoint null_brk = {0};

Those declaration should be in the block unsigned them below.

> +
> + if (ppc_breakpoint_available()) {
> + for (i = 0; i < nr_wp_slots(); i++)
> + __set_breakpoint(&null_brk, i);
> + }

I would have had a preference to the following, but that's detail I guess:

int i;
struct arch_hw_breakpoint null_brk = {0};

if (!ppc_breakpoint_available())
return;

for (i = 0; i < nr_wp_slots(); i++)
__set_breakpoint(&null_brk, i);

> }
> extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
> int hw_breakpoint_handler(struct die_args *args);
>

Christophe

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