mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 21:33:00 +00:00
b71b5b6528
Overloading of page fault notification with the notify_die() has performance issues(since the only interested components for page fault is kprobes and/or kdb) and hence this patch introduces the new notifier call chain exclusively for page fault notifications their by avoiding notifying unnecessary components in the do_page_fault() code path. Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
#ifndef _I386_KDEBUG_H
|
|
#define _I386_KDEBUG_H 1
|
|
|
|
/*
|
|
* Aug-05 2004 Ported by Prasanna S Panchamukhi <prasanna@in.ibm.com>
|
|
* from x86_64 architecture.
|
|
*/
|
|
#include <linux/notifier.h>
|
|
|
|
struct pt_regs;
|
|
|
|
struct die_args {
|
|
struct pt_regs *regs;
|
|
const char *str;
|
|
long err;
|
|
int trapnr;
|
|
int signr;
|
|
};
|
|
|
|
extern int register_die_notifier(struct notifier_block *);
|
|
extern int unregister_die_notifier(struct notifier_block *);
|
|
extern int register_page_fault_notifier(struct notifier_block *);
|
|
extern int unregister_page_fault_notifier(struct notifier_block *);
|
|
extern struct atomic_notifier_head i386die_chain;
|
|
|
|
|
|
/* Grossly misnamed. */
|
|
enum die_val {
|
|
DIE_OOPS = 1,
|
|
DIE_INT3,
|
|
DIE_DEBUG,
|
|
DIE_PANIC,
|
|
DIE_NMI,
|
|
DIE_DIE,
|
|
DIE_NMIWATCHDOG,
|
|
DIE_KERNELDEBUG,
|
|
DIE_TRAP,
|
|
DIE_GPF,
|
|
DIE_CALL,
|
|
DIE_NMI_IPI,
|
|
DIE_PAGE_FAULT,
|
|
};
|
|
|
|
static inline int notify_die(enum die_val val, const char *str,
|
|
struct pt_regs *regs, long err, int trap, int sig)
|
|
{
|
|
struct die_args args = {
|
|
.regs = regs,
|
|
.str = str,
|
|
.err = err,
|
|
.trapnr = trap,
|
|
.signr = sig
|
|
};
|
|
return atomic_notifier_call_chain(&i386die_chain, val, &args);
|
|
}
|
|
|
|
#endif
|