forked from Minki/linux
4f9e87c045
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>
43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
#ifndef _ASM_POWERPC_KDEBUG_H
|
|
#define _ASM_POWERPC_KDEBUG_H
|
|
#ifdef __KERNEL__
|
|
|
|
/* nearly identical to x86_64/i386 code */
|
|
|
|
#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 powerpc_die_chain;
|
|
|
|
/* Grossly misnamed. */
|
|
enum die_val {
|
|
DIE_OOPS = 1,
|
|
DIE_IABR_MATCH,
|
|
DIE_DABR_MATCH,
|
|
DIE_BPT,
|
|
DIE_SSTEP,
|
|
DIE_PAGE_FAULT,
|
|
};
|
|
|
|
static inline int notify_die(enum die_val val,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(&powerpc_die_chain, val, &args);
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_POWERPC_KDEBUG_H */
|