forked from luck/tmp_suning_uos_patched
d98f8f0518
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>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
#ifndef _SPARC64_KDEBUG_H
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#define _SPARC64_KDEBUG_H
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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 sparc64die_chain;
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extern void bad_trap(struct pt_regs *, long);
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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_DEBUG, /* ta 0x70 */
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DIE_DEBUG_2, /* ta 0x71 */
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DIE_DIE,
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DIE_TRAP,
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DIE_TRAP_TL1,
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DIE_GPF,
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DIE_CALL,
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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,
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long err, int trap, int sig)
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{
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struct die_args args = { .regs = regs,
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.str = str,
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.err = err,
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.trapnr = trap,
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.signr = sig };
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return atomic_notifier_call_chain(&sparc64die_chain, val, &args);
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}
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#endif
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