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[AVR32] optimize pagefault path

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Avoid the costly notifier list in the pagefault path and call
the kprobes code directly.  The same change went into the 2.6.22
cycle for powerpc, 2s390 and sparc64 already.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
This commit is contained in:
Christoph Hellwig 2007-05-12 17:56:11 +02:00 committed by Haavard Skinnemoen
parent 5d1938c83c
commit 9caebec7b8
4 changed files with 27 additions and 34 deletions
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7
arch/avr32/kernel/kprobes.c
View File

@ -179,7 +179,7 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs)
return 1;
}
static int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
struct kprobe *cur = kprobe_running();
@ -216,11 +216,6 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
if (post_kprobe_handler(args->regs))
ret = NOTIFY_STOP;
break;
case DIE_FAULT:
if (kprobe_running()
&& kprobe_fault_handler(args->regs, args->trapnr))
ret = NOTIFY_STOP;
break;
default:
break;
}

36
arch/avr32/mm/fault.c
View File

@ -12,41 +12,30 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/kdebug.h>
#include <linux/kprobes.h>
#include <asm/mmu_context.h>
#include <asm/sysreg.h>
#include <asm/tlb.h>
#include <asm/uaccess.h>
#ifdef CONFIG_KPROBES
ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
/* Hook to register for page fault notifications */
int register_page_fault_notifier(struct notifier_block *nb)
static inline int notify_page_fault(struct pt_regs *regs, int trap)
{
return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
int ret = 0;
if (!user_mode(regs)) {
if (kprobe_running() && kprobe_fault_handler(regs, trap))
ret = 1;
}
int unregister_page_fault_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
}
static inline int notify_page_fault(enum die_val val, struct pt_regs *regs,
int trap, int sig)
{
struct die_args args = {
.regs = regs,
.trapnr = trap,
};
return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
return ret;
}
#else
static inline int notify_page_fault(enum die_val val, struct pt_regs *regs,
int trap, int sig)
static inline int notify_page_fault(struct pt_regs *regs, int trap)
{
return NOTIFY_DONE;
return 0;
}
#endif
@ -76,8 +65,7 @@ asmlinkage void do_page_fault(unsigned long ecr, struct pt_regs *regs)
long signr;
int code;
if (notify_page_fault(DIE_PAGE_FAULT, regs,
ecr, SIGSEGV) == NOTIFY_STOP)
if (notify_page_fault(regs, ecr))
return;
address = sysreg_read(TLBEAR);

17
include/asm-avr32/kdebug.h
View File

@ -5,13 +5,22 @@
/* Grossly misnamed. */
enum die_val {
DIE_FAULT,
DIE_BREAKPOINT,
DIE_SSTEP,
DIE_PAGE_FAULT,
};
int register_page_fault_notifier(struct notifier_block *nb);
int unregister_page_fault_notifier(struct notifier_block *nb);
/*
* These are only here because kprobes.c wants them to implement a
* blatant layering violation. Will hopefully go away soon once all
* architectures are updated.
*/
static inline int register_page_fault_notifier(struct notifier_block *nb)
{
return 0;
}
static inline int unregister_page_fault_notifier(struct notifier_block *nb)
{
return 0;
}
#endif /* __ASM_AVR32_KDEBUG_H */

1
include/asm-avr32/kprobes.h
View File

@ -26,6 +26,7 @@ struct arch_specific_insn {
kprobe_opcode_t insn[MAX_INSN_SIZE];
};
extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
extern int kprobe_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data);