Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
powerpc/watchpoints: Simplify watchpoint reinsertion
We only remove watchpoints when they have the perf_single_step flag set,
so we can reinsert them during the first iteration.
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230801011744.153973-5-bgray@linux.ibm.com
authored by
Benjamin Gray
and committed by
Michael Ellerman
5a2d8b9c
1e60f356
+1
-11
+1
-11
arch/powerpc/kernel/hw_breakpoint.c
+1
-11
arch/powerpc/kernel/hw_breakpoint.c
···
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perf_bp_event(bp, regs);
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info->perf_single_step = false;
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-
}
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-
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if (!found)
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return NOTIFY_DONE;
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-
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-
for (int i = 0; i < nr_wp_slots(); i++) {
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struct perf_event *bp = __this_cpu_read(bp_per_reg[i]);
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if (!bp)
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continue;
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-
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__set_breakpoint(i, counter_arch_bp(bp));
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}
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···
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* If the process was being single-stepped by ptrace, let the
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* other single-step actions occur (e.g. generate SIGTRAP).
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*/
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if (test_thread_flag(TIF_SINGLESTEP))
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+
if (!found || test_thread_flag(TIF_SINGLESTEP))
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return NOTIFY_DONE;
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return NOTIFY_STOP;