forked from luck/tmp_suning_uos_patched
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
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#define _ASM_POWERPC_KDEBUG_H
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#ifdef __KERNEL__
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/* nearly identical to x86_64/i386 code */
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#include <linux/notifier.h>
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struct pt_regs;
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struct die_args {
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struct pt_regs *regs;
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const char *str;
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long err;
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int trapnr;
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int signr;
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};
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extern int register_die_notifier(struct notifier_block *);
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extern int unregister_die_notifier(struct notifier_block *);
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extern int register_page_fault_notifier(struct notifier_block *);
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extern int unregister_page_fault_notifier(struct notifier_block *);
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extern struct atomic_notifier_head powerpc_die_chain;
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/* Grossly misnamed. */
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enum die_val {
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DIE_OOPS = 1,
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DIE_IABR_MATCH,
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DIE_DABR_MATCH,
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DIE_BPT,
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DIE_SSTEP,
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DIE_PAGE_FAULT,
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};
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static inline int notify_die(enum die_val val,char *str,struct pt_regs *regs,long err,int trap, int sig)
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{
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struct die_args args = { .regs=regs, .str=str, .err=err, .trapnr=trap,.signr=sig };
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return atomic_notifier_call_chain(&powerpc_die_chain, val, &args);
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}
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_KDEBUG_H */
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