diff options
| author | Ravi Bangoria <ravi.bangoria@linux.ibm.com> | 2020-05-14 16:47:35 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-19 00:11:05 +1000 |
| commit | 6b424efa119d5ea06b15ff240dddc3b4b9f9cdfb (patch) | |
| tree | 4ea2eb0294720b9913b767cabe2f93b498f26e9d /arch/powerpc/kernel/hw_breakpoint.c | |
| parent | 303e6a9ddcdc168e92253c78cdb4bbe1e10d78b3 (diff) | |
powerpc/watchpoint: Use loop for thread_struct->ptrace_bps
ptrace_bps is already an array of size HBP_NUM_MAX. But we use
hardcoded index 0 while fetching/updating it. Convert such code
to loop over array.
ptrace interface to use multiple watchpoint remains same. eg:
two PPC_PTRACE_SETHWDEBUG calls will create two watchpoint if
underneath hw supports it.
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Link: https://lore.kernel.org/r/20200514111741.97993-11-ravi.bangoria@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/hw_breakpoint.c')
| -rw-r--r-- | arch/powerpc/kernel/hw_breakpoint.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c index f5472402c06d..917cca73dbc3 100644 --- a/arch/powerpc/kernel/hw_breakpoint.c +++ b/arch/powerpc/kernel/hw_breakpoint.c @@ -420,10 +420,13 @@ NOKPROBE_SYMBOL(hw_breakpoint_exceptions_notify); */ void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { + int i; struct thread_struct *t = &tsk->thread; - unregister_hw_breakpoint(t->ptrace_bps[0]); - t->ptrace_bps[0] = NULL; + for (i = 0; i < nr_wp_slots(); i++) { + unregister_hw_breakpoint(t->ptrace_bps[i]); + t->ptrace_bps[i] = NULL; + } } void hw_breakpoint_pmu_read(struct perf_event *bp) |