implement new notifier function to panic_notifier_list

This patch implements new notifier function to panic_notifier_list. We can change the list of order by debugfs.

Thanks,

---

---
diff -uprN linux-2.6.23-rc9.orig/arch/alpha/kernel/setup.c linux-2.6.23-rc9/arch/alpha/kernel/setup.c
--- linux-2.6.23-rc9.orig/arch/alpha/kernel/setup.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/alpha/kernel/setup.c 2007-10-04 09:49:34.440000000 +0900
@@ -45,14 +45,22 @@
#include <asm/io.h>
#include <linux/log2.h>

-extern struct atomic_notifier_head panic_notifier_list;
+extern struct tunable_notifier_head panic_notifier_list;
static int alpha_panic_event(struct notifier_block *, unsigned long, void *);
-static struct notifier_block alpha_panic_block = {
+static struct notifier_block alpha_panic_block_base = {
alpha_panic_event,
NULL,
INT_MAX /* try to do it first */
};

+static struct tunable_notifier_block alpha_panic_block = {
+ &alpha_panic_block_base,
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
@@ -522,8 +530,8 @@ setup_arch(char **cmdline_p)
}

/* Register a call for panic conditions. */
- atomic_notifier_chain_register(&panic_notifier_list,
- &alpha_panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list,
+ &alpha_panic_block, "alpha_panic", NULL);

#ifdef CONFIG_ALPHA_GENERIC
/* Assume that we've booted from SRM if we haven't booted from MILO.
diff -uprN linux-2.6.23-rc9.orig/arch/arm/mach-omap1/board-voiceblue.c linux-2.6.23-rc9/arch/arm/mach-omap1/board-voiceblue.c
--- linux-2.6.23-rc9.orig/arch/arm/mach-omap1/board-voiceblue.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/arm/mach-omap1/board-voiceblue.c 2007-10-04
09:53:17.008000000 +0900
@@ -228,14 +228,23 @@ static int panic_event(struct notifier_b
return NOTIFY_DONE;
}

-static struct notifier_block panic_block = { +static struct notifier_block panic_block_base = {
.notifier_call = panic_event,
};

+static struct tunable_notifier_block panic_block = {
+ .nb = &panic_block_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
static int __init voiceblue_setup(void)
{
/* Setup panic notifier */
- notifier_chain_register(&panic_notifier_list, &panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list, &panic_block,
+ "VoiceBlue", NULL);

return 0;
}
diff -uprN linux-2.6.23-rc9.orig/arch/mips/sgi-ip22/ip22-reset.c linux-2.6.23-rc9/arch/mips/sgi-ip22/ip22-reset.c
--- linux-2.6.23-rc9.orig/arch/mips/sgi-ip22/ip22-reset.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/mips/sgi-ip22/ip22-reset.c 2007-10-04
10:04:51.752000000 +0900
@@ -226,10 +226,18 @@ static int panic_event(struct notifier_b
return NOTIFY_DONE;
}

-static struct notifier_block panic_block = { +static struct notifier_block panic_block_base = {
.notifier_call = panic_event,
};

+static struct tunable_notifier_block panic_block = {
+ .nb = &panic_block_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
static int __init reboot_setup(void)
{
_machine_restart = sgi_machine_restart;
@@ -239,7 +247,8 @@ static int __init reboot_setup(void)
request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL); init_timer(&blink_timer);
blink_timer.function = blink_timeout;
- atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list, &panic_block,
+ "sgi-ip22", NULL);

return 0;
}
diff -uprN linux-2.6.23-rc9.orig/arch/mips/sgi-ip32/ip32-reset.c linux-2.6.23-rc9/arch/mips/sgi-ip32/ip32-reset.c
--- linux-2.6.23-rc9.orig/arch/mips/sgi-ip32/ip32-reset.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/mips/sgi-ip32/ip32-reset.c 2007-10-04
10:04:32.988000000 +0900
@@ -175,10 +175,18 @@ static int panic_event(struct notifier_b
return NOTIFY_DONE;
}

-static struct notifier_block panic_block = { +static struct notifier_block panic_block_base = {
.notifier_call = panic_event,
};

+static struct tunable_notifier_block panic_block = {
+ .nb = &panic_block_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
static __init int ip32_reboot_setup(void)
{
/* turn on the green led only */
@@ -193,7 +201,8 @@ static __init int ip32_reboot_setup(void

init_timer(&blink_timer);
blink_timer.function = blink_timeout;
- atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list, &panic_block,
+ "sgi-ip32", NULL);

if (request_irq(MACEISA_RTC_IRQ, ip32_rtc_int, 0, "rtc", NULL))
panic("Can't allocate MACEISA RTC IRQ");
diff -uprN linux-2.6.23-rc9.orig/arch/parisc/kernel/pdc_chassis.c linux-2.6.23-rc9/arch/parisc/kernel/pdc_chassis.c
--- linux-2.6.23-rc9.orig/arch/parisc/kernel/pdc_chassis.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/parisc/kernel/pdc_chassis.c 2007-10-04
10:03:22.624000000 +0900
@@ -101,11 +101,18 @@ static int pdc_chassis_panic_event(struc
}

-static struct notifier_block pdc_chassis_panic_block = { +static struct notifier_block pdc_chassis_panic_block_base = {
.notifier_call = pdc_chassis_panic_event, .priority = INT_MAX,
};

+static struct tunable_notifier_block pdc_chassis_panic_block = {
+ .nb = &pdc_chassis_panic_block_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};

/**
* parisc_reboot_event() - Called by the reboot handler.
@@ -144,8 +151,8 @@ void __init parisc_pdc_chassis_init(void
PDC_CHASSIS_VER);

/* initialize panic notifier chain */
- atomic_notifier_chain_register(&panic_notifier_list,
- &pdc_chassis_panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list,
+ &pdc_chassis_panic_block, "pdc_chassis", NULL);

/* initialize reboot notifier chain */ register_reboot_notifier(&pdc_chassis_reboot_block);
diff -uprN linux-2.6.23-rc9.orig/arch/powerpc/kernel/setup-common.c linux-2.6.23-rc9/arch/powerpc/kernel/setup-common.c
--- linux-2.6.23-rc9.orig/arch/powerpc/kernel/setup-common.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/powerpc/kernel/setup-common.c 2007-10-04
10:12:59.352000000 +0900
@@ -534,14 +534,23 @@ static int ppc_panic_event(struct notifi
return NOTIFY_DONE;
}

-static struct notifier_block ppc_panic_block = { +static struct notifier_block ppc_panic_block_base = {
.notifier_call = ppc_panic_event,
.priority = INT_MIN /* may not return; must be done last */
};

+static struct tunable_notifier_block ppc_panic_block = {
+ .nb = &ppc_panic_block_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
void __init setup_panic(void)
{
- atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list, &ppc_panic_block,
+ "powerpc", NULL);
}

#ifdef CONFIG_CHECK_CACHE_COHERENCY
diff -uprN linux-2.6.23-rc9.orig/arch/ppc/platforms/prep_setup.c linux-2.6.23-rc9/arch/ppc/platforms/prep_setup.c
--- linux-2.6.23-rc9.orig/arch/ppc/platforms/prep_setup.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/ppc/platforms/prep_setup.c 2007-10-04
13:33:55.108000000 +0900
@@ -712,12 +712,20 @@ ibm_statusled_panic(struct notifier_bloc
return NOTIFY_DONE;
}

-static struct notifier_block ibm_statusled_block = { +static struct notifier_block ibm_statusled_block_base = {
ibm_statusled_panic,
NULL,
INT_MAX /* try to do it first */
};

+static struct tunable_notifier_block ibm_statusled_block = {
+ &ibm_statusled_block_base,
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+
static void
ibm_statusled_progress(char *s, unsigned short hex) {
@@ -732,8 +740,8 @@ ibm_statusled_progress(char *s, unsigned
hex = 0xfff;
if (!notifier_installed) {
++notifier_installed;
- atomic_notifier_chain_register(&panic_notifier_list,
- &ibm_statusled_block);
+ tunable_notifier_chain_register(&panic_notifier_list,
+ &ibm_statusled_block, "IBM_statusLED", NULL);
}
}
else
diff -uprN linux-2.6.23-rc9.orig/arch/s390/kernel/ipl.c linux-2.6.23-rc9/arch/s390/kernel/ipl.c

@@ -1036,11 +1036,19 @@ static int shutdown_on_panic_notify(stru
 	return NOTIFY_OK;
 }
 
-static struct notifier_block shutdown_on_panic_nb = {
+static struct notifier_block shutdown_on_panic_nb_base = {
 	.notifier_call = shutdown_on_panic_notify,
 	.priority = SHUTDOWN_ON_PANIC_PRIO
 };
 
+static struct tunable_notifier_block shutdown_on_panic_nb = {
+	.nb		= &shutdown_on_panic_nb_base,
+	.head		= NULL,
+	.dir		= NULL,
+	.pri_dentry	= NULL,
+	.desc_dentry	= NULL
+};
+
 static int __init dump_init(void)
 {
 	int rc;

@@ -1075,8 +1083,8 @@ static int __init shutdown_actions_init(
 		firmware_unregister(&shutdown_actions_subsys);
 		return rc;
 	}
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &shutdown_on_panic_nb);
+	tunable_notifier_chain_register(&panic_notifier_list,
+				       &shutdown_on_panic_nb, "s390_ipl", NULL);
 	return 0;
 }
 

diff -uprN linux-2.6.23-rc9.orig/arch/s390/kernel/setup.c linux-2.6.23-rc9/arch/s390/kernel/setup.c
--- linux-2.6.23-rc9.orig/arch/s390/kernel/setup.c 2007-10-02 12:24:52.000000000
+0900
+++ linux-2.6.23-rc9/arch/s390/kernel/setup.c 2007-10-04 13:36:51.792000000 +0900
@@ -173,11 +173,19 @@ static int vmpanic_notify(struct notifie

#define PANIC_PRI_VMPANIC 0

-static struct notifier_block vmpanic_nb = {
+static struct notifier_block vmpanic_nb_base = {
.notifier_call = vmpanic_notify,
.priority = PANIC_PRI_VMPANIC
};

+static struct tunable_notifier_block vmpanic_nb = {
+ .nb = &vmpanic_nb_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
static int __init vmpanic_setup(char *str)
{
static int register_done __initdata = 0;
@@ -186,8 +194,8 @@ static int __init vmpanic_setup(char *st
vmpanic_cmd[127] = 0;
if (!register_done) {
register_done = 1;
- atomic_notifier_chain_register(&panic_notifier_list,
- &vmpanic_nb);
+ tunable_notifier_chain_register(&panic_notifier_list,
+ &vmpanic_nb, "s390_panic", NULL);
}
return 1;
}
diff -uprN linux-2.6.23-rc9.orig/arch/sparc64/kernel/sstate.c linux-2.6.23-rc9/arch/sparc64/kernel/sstate.c
--- linux-2.6.23-rc9.orig/arch/sparc64/kernel/sstate.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/sparc64/kernel/sstate.c 2007-10-04 13:39:06.692000000
+0900
@@ -82,11 +82,19 @@ static int sstate_panic_event(struct not
return NOTIFY_DONE;
}

-static struct notifier_block sstate_panic_block = { +static struct notifier_block sstate_panic_block_base = {
.notifier_call = sstate_panic_event,
.priority = INT_MAX,
};

+static struct tunable_notifier_block sstate_panic_block = {
+ .nb = &sstate_panic_block_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
void __init sun4v_sstate_init(void)
{
unsigned long major, minor;
@@ -99,6 +107,6 @@ void __init sun4v_sstate_init(void)
hv_supports_soft_state = 1;

prom_sun4v_guest_soft_state();
- atomic_notifier_chain_register(&panic_notifier_list,
- &sstate_panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list,
+ &sstate_panic_block, "sstate" ,NULL);
}
diff -uprN linux-2.6.23-rc9.orig/arch/um/drivers/mconsole_kern.c linux-2.6.23-rc9/arch/um/drivers/mconsole_kern.c
--- linux-2.6.23-rc9.orig/arch/um/drivers/mconsole_kern.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/um/drivers/mconsole_kern.c 2007-10-04
15:30:04.784000000 +0900
@@ -928,16 +928,24 @@ static int notify_panic(struct notifier_
return(0);
}

-static struct notifier_block panic_exit_notifier = { +static struct notifier_block panic_exit_notifier_base = {
.notifier_call = notify_panic,
.next = NULL,
.priority = 1
};

+static struct tunable_notifier_block panic_exit_notifier = {
+ .nb = &panic_exit_notifier_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
static int add_notifier(void)
{
- atomic_notifier_chain_register(&panic_notifier_list,
- &panic_exit_notifier);
+ tunable_notifier_chain_register(&panic_notifier_list,
+ &panic_exit_notifier, "mconsole", NULL);
return(0);
}

diff -uprN linux-2.6.23-rc9.orig/arch/um/kernel/um_arch.c linux-2.6.23-rc9/arch/um/kernel/um_arch.c
--- linux-2.6.23-rc9.orig/arch/um/kernel/um_arch.c 2007-10-02 12:24:52.000000000
+0900
+++ linux-2.6.23-rc9/arch/um/kernel/um_arch.c 2007-10-04 13:42:53.880000000 +0900
@@ -478,16 +478,24 @@ static int panic_exit(struct notifier_bl
return 0;
}

-static struct notifier_block panic_exit_notifier = { +static struct notifier_block panic_exit_notifier_base = {
.notifier_call = panic_exit,
.next = NULL,
.priority = 0
};

+static struct tunable_notifier_block panic_exit_notifier = {
+ .nb = &panic_exit_notifier_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
void __init setup_arch(char **cmdline_p)
{
- atomic_notifier_chain_register(&panic_notifier_list,
- &panic_exit_notifier);
+ tunable_notifier_chain_register(&panic_notifier_list,
+ &panic_exit_notifier, "um", NULL);
paging_init();
strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line;
diff -uprN linux-2.6.23-rc9.orig/arch/xtensa/platform-iss/setup.c linux-2.6.23-rc9/arch/xtensa/platform-iss/setup.c
--- linux-2.6.23-rc9.orig/arch/xtensa/platform-iss/setup.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/arch/xtensa/platform-iss/setup.c 2007-10-04
13:44:52.032000000 +0900
@@ -98,13 +98,22 @@ iss_panic_event(struct notifier_block *t
return NOTIFY_DONE;
}

-static struct notifier_block iss_panic_block = { +static struct notifier_block iss_panic_block_base = {
iss_panic_event,
NULL,
0
};

+static struct tunable_notifier_block iss_panic_block = {
+ &iss_panic_block_base,
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+
void __init platform_setup(char **p_cmdline)
{
- atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list, &iss_panic_block,
+ "iss_panic", NULL);
}
diff -uprN linux-2.6.23-rc9.orig/drivers/char/ipmi/ipmi_msghandler.c linux-2.6.23-rc9/drivers/char/ipmi/ipmi_msghandler.c
--- linux-2.6.23-rc9.orig/drivers/char/ipmi/ipmi_msghandler.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/drivers/char/ipmi/ipmi_msghandler.c 2007-10-04
09:46:25.780000000 +0900
@@ -4070,12 +4070,20 @@ static int panic_event(struct notifier_b
return NOTIFY_DONE;
}

-static struct notifier_block panic_block = { +static struct notifier_block panic_block_base = {
.notifier_call = panic_event,
.next = NULL,
.priority = 200 /* priority: INT_MAX >= x >= 0 */
};

+static struct tunable_notifier_block panic_block = {
+ .nb = &panic_block_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
static int ipmi_init_msghandler(void)
{
int rv;
@@ -4105,7 +4113,8 @@ static int ipmi_init_msghandler(void)
setup_timer(&ipmi_timer, ipmi_timeout, 0); mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);

- atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+ tunable_notifier_chain_register(&panic_notifier_list, &panic_block,
+ "ipmi_msghandler", NULL);

initialized = 1;

@@ -4125,7 +4134,7 @@ static __exit void cleanup_ipmi(void)
if (!initialized)
return;

- atomic_notifier_chain_unregister(&panic_notifier_list, &panic_block);
+ tunable_notifier_chain_unregister(&panic_notifier_list, &panic_block);

/* This can't be called if any interfaces exist, so no worry about
shutting down the interfaces. */
diff -uprN linux-2.6.23-rc9.orig/drivers/char/ipmi/ipmi_watchdog.c linux-2.6.23-rc9/drivers/char/ipmi/ipmi_watchdog.c
--- linux-2.6.23-rc9.orig/drivers/char/ipmi/ipmi_watchdog.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/drivers/char/ipmi/ipmi_watchdog.c 2007-10-04
09:46:25.780000000 +0900
@@ -1055,12 +1055,19 @@ static int wdog_panic_handler(struct not
return NOTIFY_OK;
}

-static struct notifier_block wdog_panic_notifier = { +static struct notifier_block wdog_panic_notifier_base = {
.notifier_call = wdog_panic_handler,
.next = NULL,
.priority = 150 /* priority: INT_MAX >= x >= 0 */
};

+static struct tunable_notifier_block wdog_panic_notifier = {
+ .nb = &wdog_panic_notifier_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};

static void ipmi_new_smi(int if_num, struct device *device) {
@@ -1212,8 +1219,8 @@ static int __init ipmi_wdog_init(void)
check_parms();

register_reboot_notifier(&wdog_reboot_notifier);
- atomic_notifier_chain_register(&panic_notifier_list,
- &wdog_panic_notifier);
+ tunable_notifier_chain_register(&panic_notifier_list,
+ &wdog_panic_notifier, "ipmi_wdog", NULL);

rv = ipmi_smi_watcher_register(&smi_watcher);
if (rv) {
@@ -1221,7 +1228,7 @@ static int __init ipmi_wdog_init(void)
if (preaction_val == WDOG_PRETIMEOUT_NMI)
release_nmi(&ipmi_nmi_handler);
#endif
- atomic_notifier_chain_unregister(&panic_notifier_list,
+ tunable_notifier_chain_unregister(&panic_notifier_list,
&wdog_panic_notifier);
unregister_reboot_notifier(&wdog_reboot_notifier); printk(KERN_WARNING PFX "can't register smi watcher\n");
@@ -1243,7 +1250,7 @@ static void __exit ipmi_wdog_exit(void)
release_nmi(&ipmi_nmi_handler);
#endif

- atomic_notifier_chain_unregister(&panic_notifier_list,
+ tunable_notifier_chain_unregister(&panic_notifier_list,
&wdog_panic_notifier);
unregister_reboot_notifier(&wdog_reboot_notifier);
}
diff -uprN linux-2.6.23-rc9.orig/drivers/lguest/lguest.c linux-2.6.23-rc9/drivers/lguest/lguest.c
--- linux-2.6.23-rc9.orig/drivers/lguest/lguest.c 2007-10-02 12:24:52.000000000
+0900
+++ linux-2.6.23-rc9/drivers/lguest/lguest.c 2007-10-04 15:32:39.408000000 +0900
@@ -880,16 +880,25 @@ static int lguest_panic(struct notifier_
return NOTIFY_DONE;
}

-static struct notifier_block paniced = {
+static struct notifier_block paniced_base = {
.notifier_call = lguest_panic
};

+static struct tunable_notifier_block paniced = {
+ .nb = &paniced_base,
+ .head = NULL,
+ .dir = NULL,
+ .pri_dentry = NULL,
+ .desc_dentry = NULL
+};
+
/* Setting up memory is fairly easy. */
static __init char *lguest_memory_setup(void)
{
/* We do this here and not earlier because lockcheck barfs if we do it
* before start_kernel() */
- atomic_notifier_chain_register(&panic_notifier_list, &paniced);
+ tunable_notifier_chain_register(&panic_notifier_list, &paniced,
+ "lguest", NULL);

/* The Linux bootloader header contains an "e820" memory map: the
* Launcher populated the first entry with our memory limit. */
diff -uprN linux-2.6.23-rc9.orig/drivers/misc/ibmasm/heartbeat.c linux-2.6.23-rc9/drivers/misc/ibmasm/heartbeat.c
--- linux-2.6.23-rc9.orig/drivers/misc/ibmasm/heartbeat.c 2007-10-02
12:24:52.000000000 +0900
+++ linux-2.6.23-rc9/drivers/misc/ibmasm/heartbeat.c 2007-10-04
09:46:25.780000000 +0900
@@ -48,16 +48,20 @@ static int panic_happened(struct notifie
return 0;
}

-static struct notifier_block panic_notifier = { panic_happened, NULL, 1 }; +static struct notifier_block panic_notifier_base = { panic_happened, NULL, 1 }; +
+static struct tunable_notifier_block panic_notifier = { &panic_notifier_base,
+ NULL, NULL, NULL, NULL};

void ibmasm_register_panic_notifier(void)
{
- atomic_notifier_chain_register(&panic_notifier_list, &panic_notifier);
+ tunable_notifier_chain_register(&panic_notifier_list, &panic_notifier,
+ "ibmasm", NULL);
}

void ibmasm_unregister_panic_notifier(void)
{
- atomic_notifier_chain_unregister(&panic_notifier_list,
+ tunable_notifier_chain_unregister(&panic_notifier_list,
&panic_notifier);
}

diff -uprN linux-2.6.23-rc9.orig/drivers/parisc/power.c linux-2.6.23-rc9/drivers/parisc/power.c

@@ -189,11 +189,18 @@ static int parisc_panic_event(struct not
 	return NOTIFY_DONE;
 }
 
-static struct notifier_block parisc_panic_block = {
+static struct notifier_block parisc_panic_block_base = {
 	.notifier_call	= parisc_panic_event,
 	.priority	= INT_MAX,
 };
 
+static struct tunable_notifier_block parisc_panic_block = {
+	.nb		= &parisc_panic_block_base,
+	.head		= NULL,
+	.dir		= NULL,
+	.pri_dentry	= NULL,
+	.desc_dentry	= NULL
+};
 
 static int __init power_init(void)
 {

@@ -231,8 +238,8 @@ static int __init power_init(void)
 	}
 
 	/* Register a call for panic conditions. */
-	atomic_notifier_chain_register(&panic_notifier_list,
-			&parisc_panic_block);
+	tunable_notifier_chain_register(&panic_notifier_list,
+			&parisc_panic_block, "parisc_panic", NULL);
 
 	return 0;
 }

@@ -241,7 +248,7 @@ static void __exit power_exit(void)
 {
 	kthread_stop(power_task);
 
-	atomic_notifier_chain_unregister(&panic_notifier_list,
+	tunable_notifier_chain_unregister(&panic_notifier_list,
 			&parisc_panic_block);
 
 	pdc_soft_power_button(0);

diff -uprN linux-2.6.23-rc9.orig/include/linux/kernel.h linux-2.6.23-rc9/include/linux/kernel.h

@@ -104,7 +104,7 @@ extern int cond_resched(void);
 		(__x < 0) ? -__x : __x;		\
 	})
 
-extern struct atomic_notifier_head panic_notifier_list;
+extern struct tunable_notifier_head panic_notifier_list;
 extern long (*panic_blink)(long time);
 NORET_TYPE void panic(const char * fmt, ...)
 	__attribute__ ((NORET_AND format (printf, 1, 2))) __cold;

diff -uprN linux-2.6.23-rc9.orig/kernel/panic.c linux-2.6.23-rc9/kernel/panic.c
@@ -28,7 +28,7 @@ static DEFINE_SPINLOCK(pause_on_oops_loc
 
 int panic_timeout;
 
-ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
+TUNABLE_NOTIFIER_HEAD(panic_notifier_list, "panic_notifier_list");
 
 EXPORT_SYMBOL(panic_notifier_list);
 

@@ -96,7 +96,7 @@ NORET_TYPE void panic(const char * fmt,
 	smp_send_stop();
 #endif
 
-	atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
+	tunable_notifier_call_chain(&panic_notifier_list, 0, buf);
 
 	if (!panic_blink)
 		panic_blink = no_blink;

diff -uprN linux-2.6.23-rc9.orig/kernel/softlockup.c linux-2.6.23-rc9/kernel/softlockup.c

@@ -31,10 +31,18 @@ softlock_panic(struct notifier_block *th
 	return NOTIFY_DONE;
 }
 
-static struct notifier_block panic_block = {
+static struct notifier_block panic_block_base = {
 	.notifier_call = softlock_panic,
 };
 
+static struct tunable_notifier_block panic_block = {
+	.nb		= &panic_block_base,
+	.head		= NULL,
+	.dir		= NULL,
+	.pri_dentry	= NULL,
+	.desc_dentry	= NULL
+};
+
 /*
  * Returns seconds, approximately.  We don't need nanosecond
  * resolution, and we don't need to waste time with a big divide when

@@ -193,5 +201,6 @@ __init void spawn_softlockup_task(void)
 	cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
 	register_cpu_notifier(&cpu_nfb);
 
-	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+	tunable_notifier_chain_register(&panic_notifier_list, &panic_block,
+						"softlookup", NULL);
 }

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...

Hi Randy,

Thank you for reviewing. :)
I'll fix next version.

Hi Vivek,

We can make description file with tunable_notifier_chain_register 4th argument. If developer sets 4th argument, tunable_notifier_chain_register makes /sys/kernel/debug/<name>/description file. Admin can get information from the description file.

+/**
+ * tunable_notifier_chain_register - Add notifier to an tunable notifier chain
+ * @nh: Pointer to head of the tunable notifier chain
+ * @n: New entry in notifier chain
+ * @name: Pointer to the name of the new notifier entry
+ * @desc: Pointer to the description of new entry
+ *
+ * Adds a notifier to an tunable notifier chain and makes control dir.
+ *
+ * Returns zero on success or %-ENODEV on failure.
+ */

Thanks,

Takenori Nagano <[email protected]>