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| author | David S. Miller <davem@davemloft.net> | 2012-10-14 17:59:40 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-10-14 17:59:40 -0700 |
| commit | 08280e6c4c2e8049ac61d9e8e3536ec1df629c0d (patch) | |
| tree | 0ca61313d9c74d66019a7a90306653464de091e2 | |
| parent | ddffeb8c4d0331609ef2581d84de4d763607bd37 (diff) | |
| download | linux-08280e6c4c2e8049ac61d9e8e3536ec1df629c0d.tar.bz2 | |
sparc64: Like x86 we should check current->mm during perf backtrace generation.
If the MM is not active, only report the top-level PC. Do not try to
access the address space.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | arch/sparc/kernel/perf_event.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c index e48651dace1b..9e96f849a744 100644 --- a/arch/sparc/kernel/perf_event.c +++ b/arch/sparc/kernel/perf_event.c @@ -1738,8 +1738,6 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry, { unsigned long ufp; - perf_callchain_store(entry, regs->tpc); - ufp = regs->u_regs[UREG_I6] + STACK_BIAS; do { struct sparc_stackf *usf, sf; @@ -1760,8 +1758,6 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry, { unsigned long ufp; - perf_callchain_store(entry, regs->tpc); - ufp = regs->u_regs[UREG_I6] & 0xffffffffUL; do { struct sparc_stackf32 *usf, sf; @@ -1780,6 +1776,11 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry, void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs) { + perf_callchain_store(entry, regs->tpc); + + if (!current->mm) + return; + flushw_user(); if (test_thread_flag(TIF_32BIT)) perf_callchain_user_32(entry, regs); |