powerpc/watchpoints: Explain thread_change_pc() more

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The behaviour of the thread_change_pc() function is a bit cryptic
without being more familiar with how the watchpoint logic handles
perf's after-execute semantics.

Expand the comment to explain why we can re-insert the breakpoint and
unset the perf_single_step flag.

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230801011744.153973-2-bgray@linux.ibm.com

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Benjamin Gray 2023-08-01 11:17:38 +10:00 • committed by Michael Ellerman

parent 8df9906694

commit 8f8f1cd67a

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arch/powerpc/kernel/hw_breakpoint.c

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