powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH
commit 9a5cbce421a283e6aea3c4007f141735bf9da8c3 upstream. We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH (currently 127), but we forgot to do the same for 64bit backtraces. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -243,7 +243,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
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sp = regs->gpr[1];
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perf_callchain_store(entry, next_ip);
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for (;;) {
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while (entry->nr < PERF_MAX_STACK_DEPTH) {
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fp = (unsigned long __user *) sp;
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if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp))
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return;
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