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authorRabin Vincent <rabin.vincent@stericsson.com>2012-06-15 10:23:32 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-07-09 17:39:37 +0100
commit02df19b4227e5b799e4642e88b568f9474fa78d0 (patch)
treeb83b03c19a4a0908aec006be85feb0cf2df8baa8 /arch/arm/kernel/traps.c
parentffae894035a1e0c46869eb81d53ea88ca4eaf2f0 (diff)
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ARM: 7424/1: update die handler from x86
Robustify ARM's die() handling with improvements from x86: - Fix for a deadlock (before panic in the case of panic_on_oops) if we oops under a spinlock which is also used from interrupt handler, since the old code was unconditionally enabling interrupts. - Usage of arch spinlock so lockdep etc doesn't get involved while we're trying to dump out oopses. - Deadlock prevention in the unlikely event that die() recurses. The changes all touch the same few lines of code, so they're done together in one patch. Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/traps.c')
-rw-r--r--arch/arm/kernel/traps.c78
1 files changed, 55 insertions, 23 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 4928d89758f4..2df8715c36c0 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -233,9 +233,9 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
#define S_ISA " ARM"
#endif
-static int __die(const char *str, int err, struct thread_info *thread, struct pt_regs *regs)
+static int __die(const char *str, int err, struct pt_regs *regs)
{
- struct task_struct *tsk = thread->task;
+ struct task_struct *tsk = current;
static int die_counter;
int ret;
@@ -245,12 +245,12 @@ static int __die(const char *str, int err, struct thread_info *thread, struct pt
/* trap and error numbers are mostly meaningless on ARM */
ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, SIGSEGV);
if (ret == NOTIFY_STOP)
- return ret;
+ return 1;
print_modules();
__show_regs(regs);
printk(KERN_EMERG "Process %.*s (pid: %d, stack limit = 0x%p)\n",
- TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
+ TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), end_of_stack(tsk));
if (!user_mode(regs) || in_interrupt()) {
dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp,
@@ -259,45 +259,77 @@ static int __die(const char *str, int err, struct thread_info *thread, struct pt
dump_instr(KERN_EMERG, regs);
}
- return ret;
+ return 0;
}
-static DEFINE_RAW_SPINLOCK(die_lock);
+static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+static int die_owner = -1;
+static unsigned int die_nest_count;
-/*
- * This function is protected against re-entrancy.
- */
-void die(const char *str, struct pt_regs *regs, int err)
+static unsigned long oops_begin(void)
{
- struct thread_info *thread = current_thread_info();
- int ret;
- enum bug_trap_type bug_type = BUG_TRAP_TYPE_NONE;
+ int cpu;
+ unsigned long flags;
oops_enter();
- raw_spin_lock_irq(&die_lock);
+ /* racy, but better than risking deadlock. */
+ raw_local_irq_save(flags);
+ cpu = smp_processor_id();
+ if (!arch_spin_trylock(&die_lock)) {
+ if (cpu == die_owner)
+ /* nested oops. should stop eventually */;
+ else
+ arch_spin_lock(&die_lock);
+ }
+ die_nest_count++;
+ die_owner = cpu;
console_verbose();
bust_spinlocks(1);
- if (!user_mode(regs))
- bug_type = report_bug(regs->ARM_pc, regs);
- if (bug_type != BUG_TRAP_TYPE_NONE)
- str = "Oops - BUG";
- ret = __die(str, err, thread, regs);
+ return flags;
+}
- if (regs && kexec_should_crash(thread->task))
+static void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
+{
+ if (regs && kexec_should_crash(current))
crash_kexec(regs);
bust_spinlocks(0);
+ die_owner = -1;
add_taint(TAINT_DIE);
- raw_spin_unlock_irq(&die_lock);
+ die_nest_count--;
+ if (!die_nest_count)
+ /* Nest count reaches zero, release the lock. */
+ arch_spin_unlock(&die_lock);
+ raw_local_irq_restore(flags);
oops_exit();
if (in_interrupt())
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception");
- if (ret != NOTIFY_STOP)
- do_exit(SIGSEGV);
+ if (signr)
+ do_exit(signr);
+}
+
+/*
+ * This function is protected against re-entrancy.
+ */
+void die(const char *str, struct pt_regs *regs, int err)
+{
+ enum bug_trap_type bug_type = BUG_TRAP_TYPE_NONE;
+ unsigned long flags = oops_begin();
+ int sig = SIGSEGV;
+
+ if (!user_mode(regs))
+ bug_type = report_bug(regs->ARM_pc, regs);
+ if (bug_type != BUG_TRAP_TYPE_NONE)
+ str = "Oops - BUG";
+
+ if (__die(str, err, regs))
+ sig = 0;
+
+ oops_end(flags, regs, sig);
}
void arm_notify_die(const char *str, struct pt_regs *regs,