diff options
| author | David S. Miller <davem@davemloft.net> | 2012-10-14 17:59:40 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-10-30 23:26:31 +0000 |
| commit | 6471fbc6eb71dd615075f58576ad813697700873 (patch) | |
| tree | af8448018920a3e50b613c091f873905d24a9b19 /arch | |
| parent | 1b4ea31d107d4b8985f56c939f712f8a0dd59271 (diff) | |
sparc64: Like x86 we should check current->mm during perf backtrace generation.
[ Upstream commit 08280e6c4c2e8049ac61d9e8e3536ec1df629c0d ]
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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch')
| -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 614da624330..5331ae17747 100644 --- a/arch/sparc/kernel/perf_event.c +++ b/arch/sparc/kernel/perf_event.c @@ -1422,8 +1422,6 @@ 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; @@ -1444,8 +1442,6 @@ 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; @@ -1464,6 +1460,11 @@ 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); |