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authorDavid S. Miller <davem@davemloft.net>2008-08-13 17:17:52 -0700
committerDavid S. Miller <davem@davemloft.net>2008-08-13 17:20:04 -0700
commit6f63e781eaf6a741fc65f773017154b20ed4ce3b (patch)
treea7ab148968539b4543162c233f26b46ef95ae306 /arch/sparc64
parent4f70f7a91bffdcc39f088748dc678953eb9a3fbd (diff)
sparc64: Handle stack trace attempts before irqstacks are setup.
Things like lockdep can try to do stack backtraces before the irqstack blocks have been setup. So don't try to match their ranges so early on. Also, remove unused variable in save_stack_trace(). Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/kernel/kstack.h38
-rw-r--r--arch/sparc64/kernel/stacktrace.c3
2 files changed, 21 insertions, 20 deletions
diff --git a/arch/sparc64/kernel/kstack.h b/arch/sparc64/kernel/kstack.h
index 43909d5680e..4248d969272 100644
--- a/arch/sparc64/kernel/kstack.h
+++ b/arch/sparc64/kernel/kstack.h
@@ -15,15 +15,16 @@ static inline bool kstack_valid(struct thread_info *tp, unsigned long sp)
sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
return true;
- base = (unsigned long) hardirq_stack[tp->cpu];
- if (sp >= base &&
- sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
- return true;
- base = (unsigned long) softirq_stack[tp->cpu];
- if (sp >= base &&
- sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
- return true;
-
+ if (hardirq_stack[tp->cpu]) {
+ base = (unsigned long) hardirq_stack[tp->cpu];
+ if (sp >= base &&
+ sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
+ return true;
+ base = (unsigned long) softirq_stack[tp->cpu];
+ if (sp >= base &&
+ sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
+ return true;
+ }
return false;
}
@@ -37,15 +38,16 @@ static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *
addr <= (base + THREAD_SIZE - sizeof(*regs)))
goto check_magic;
- base = (unsigned long) hardirq_stack[tp->cpu];
- if (addr >= base &&
- addr <= (base + THREAD_SIZE - sizeof(*regs)))
- goto check_magic;
- base = (unsigned long) softirq_stack[tp->cpu];
- if (addr >= base &&
- addr <= (base + THREAD_SIZE - sizeof(*regs)))
- goto check_magic;
-
+ if (hardirq_stack[tp->cpu]) {
+ base = (unsigned long) hardirq_stack[tp->cpu];
+ if (addr >= base &&
+ addr <= (base + THREAD_SIZE - sizeof(*regs)))
+ goto check_magic;
+ base = (unsigned long) softirq_stack[tp->cpu];
+ if (addr >= base &&
+ addr <= (base + THREAD_SIZE - sizeof(*regs)))
+ goto check_magic;
+ }
return false;
check_magic:
diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
index 237e7f8a40a..4e21d4a57d3 100644
--- a/arch/sparc64/kernel/stacktrace.c
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -9,8 +9,8 @@
void save_stack_trace(struct stack_trace *trace)
{
- unsigned long ksp, fp, thread_base;
struct thread_info *tp = task_thread_info(current);
+ unsigned long ksp, fp;
stack_trace_flush();
@@ -20,7 +20,6 @@ void save_stack_trace(struct stack_trace *trace)
);
fp = ksp + STACK_BIAS;
- thread_base = (unsigned long) tp;
do {
struct sparc_stackf *sf;
struct pt_regs *regs;