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Commit 08280e6c authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
parent ddffeb8c

arch/sparc/kernel/perf_event.c

+5 −4
Original line number Diff line number Diff line
@@ -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);