Commit effb83cc authored by Ilya Leoshkevich's avatar Ilya Leoshkevich Committed by Vasily Gorbik
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s390: add error handling to perf_callchain_kernel 



perf_callchain_kernel stops neither when it encounters a garbage
address, nor when it runs out of space. Fix both issues using x86
version as an inspiration.

Signed-off-by: default avatarIlya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 265f79dc

arch/s390/kernel/perf_event.c

+6 −2
Original line number Diff line number Diff line
@@ -224,9 +224,13 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, 
			   struct pt_regs *regs)

{

	struct unwind_state state;

	unsigned long addr;



	unwind_for_each_frame(&state, current, regs, 0)

		perf_callchain_store(entry, state.ip);

	unwind_for_each_frame(&state, current, regs, 0) {

		addr = unwind_get_return_address(&state);

		if (!addr || perf_callchain_store(entry, addr))

			return;

	}

}



/* Perf definitions for PMU event attributes in sysfs */

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