x86, mm: fault.c, unify oops handling
Impact: add oops-recursion check to 32-bit
Unify the oops state-machine, to the 64-bit version. It is
slightly more careful in that it does a recursion check
in oops_begin(), and is thus more likely to show the relevant
oops.
It also means that 32-bit will print one more line at the
end of pagefault triggered oopses:
printk(KERN_EMERG "CR2: %016lx\n", address);
Which is generally good information to be seen in partial-dump
digital-camera jpegs ;-)
The downside is the somewhat more complex critical path. Both
variants have been tested well meanwhile by kernel developers
crashing their boxes so i dont think this is a practical worry.
This removes 3 ugly #ifdefs from no_context() and makes the
function a lot nicer read.
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index ebfaca3..8fe2dd2 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -659,11 +659,8 @@
{
struct task_struct *tsk = current;
unsigned long *stackend;
-
-#ifdef CONFIG_X86_64
unsigned long flags;
int sig;
-#endif
/* Are we prepared to handle this kernel fault? */
if (fixup_exception(regs))
@@ -690,11 +687,7 @@
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice:
*/
-#ifdef CONFIG_X86_32
- bust_spinlocks(1);
-#else
flags = oops_begin();
-#endif
show_fault_oops(regs, error_code, address);
@@ -702,15 +695,10 @@
if (*stackend != STACK_END_MAGIC)
printk(KERN_ALERT "Thread overran stack, or stack corrupted\n");
- tsk->thread.cr2 = address;
- tsk->thread.trap_no = 14;
- tsk->thread.error_code = error_code;
+ tsk->thread.cr2 = address;
+ tsk->thread.trap_no = 14;
+ tsk->thread.error_code = error_code;
-#ifdef CONFIG_X86_32
- die("Oops", regs, error_code);
- bust_spinlocks(0);
- do_exit(SIGKILL);
-#else
sig = SIGKILL;
if (__die("Oops", regs, error_code))
sig = 0;
@@ -719,7 +707,6 @@
printk(KERN_EMERG "CR2: %016lx\n", address);
oops_end(flags, regs, sig);
-#endif
}
/*