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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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1eeb66a1bb
This patch moves the die notifier handling to common code. Previous various architectures had exactly the same code for it. Note that the new code is compiled unconditionally, this should be understood as an appel to the other architecture maintainer to implement support for it aswell (aka sprinkling a notify_die or two in the proper place) arm had a notifiy_die that did something totally different, I renamed it to arm_notify_die as part of the patch and made it static to the file it's declared and used at. avr32 used to pass slightly less information through this interface and I brought it into line with the other architectures. [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: fix vmalloc_sync_all bustage] [bryan.wu@analog.com: fix vmalloc_sync_all in nommu] Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: <linux-arch@vger.kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
/**
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* @file nmi_timer_int.c
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*
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* @remark Copyright 2003 OProfile authors
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* @remark Read the file COPYING
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*
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* @author Zwane Mwaikambo <zwane@linuxpower.ca>
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*/
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/oprofile.h>
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#include <linux/rcupdate.h>
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#include <linux/kdebug.h>
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#include <asm/nmi.h>
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#include <asm/apic.h>
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#include <asm/ptrace.h>
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static int profile_timer_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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struct die_args *args = (struct die_args *)data;
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int ret = NOTIFY_DONE;
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switch(val) {
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case DIE_NMI:
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oprofile_add_sample(args->regs, 0);
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ret = NOTIFY_STOP;
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break;
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default:
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break;
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}
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return ret;
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}
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static struct notifier_block profile_timer_exceptions_nb = {
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.notifier_call = profile_timer_exceptions_notify,
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.next = NULL,
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.priority = 0
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};
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static int timer_start(void)
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{
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if (register_die_notifier(&profile_timer_exceptions_nb))
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return 1;
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return 0;
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}
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static void timer_stop(void)
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{
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unregister_die_notifier(&profile_timer_exceptions_nb);
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synchronize_sched(); /* Allow already-started NMIs to complete. */
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}
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int __init op_nmi_timer_init(struct oprofile_operations * ops)
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{
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if ((nmi_watchdog != NMI_IO_APIC) || (atomic_read(&nmi_active) <= 0))
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return -ENODEV;
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ops->start = timer_start;
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ops->stop = timer_stop;
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ops->cpu_type = "timer";
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printk(KERN_INFO "oprofile: using NMI timer interrupt.\n");
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return 0;
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}
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