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authorEric W. Biederman <ebiederm@xmission.com>2005-06-25 14:57:52 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 16:24:48 -0700
commitdc009d92435f99498cbc579ce76bf28e837e2c14 (patch)
tree2ba8732b28225593d996b8faa079dc6ab4bbc9bc /kernel/panic.c
parentd0537508a9921efced238b20967e50e519ac34af (diff)
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[PATCH] kexec: add kexec syscalls
This patch introduces the architecture independent implementation the sys_kexec_load, the compat_sys_kexec_load system calls. Kexec on panic support has been integrated into the core patch and is relatively clean. In addition the hopefully architecture independent option crashkernel=size@location has been docuemented. It's purpose is to reserve space for the panic kernel to live, and where no DMA transfer will ever be setup to access. Signed-off-by: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Alexander Nyberg <alexn@telia.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/panic.c')
-rw-r--r--kernel/panic.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/kernel/panic.c b/kernel/panic.c
index 081f7465fc8..66f43d33cd8 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -18,6 +18,7 @@
#include <linux/sysrq.h>
#include <linux/interrupt.h>
#include <linux/nmi.h>
+#include <linux/kexec.h>
int panic_timeout;
int panic_on_oops;
@@ -63,6 +64,13 @@ NORET_TYPE void panic(const char * fmt, ...)
unsigned long caller = (unsigned long) __builtin_return_address(0);
#endif
+ /*
+ * It's possible to come here directly from a panic-assertion and not
+ * have preempt disabled. Some functions called from here want
+ * preempt to be disabled. No point enabling it later though...
+ */
+ preempt_disable();
+
bust_spinlocks(1);
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
@@ -70,7 +78,19 @@ NORET_TYPE void panic(const char * fmt, ...)
printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
bust_spinlocks(0);
+ /*
+ * If we have crashed and we have a crash kernel loaded let it handle
+ * everything else.
+ * Do we want to call this before we try to display a message?
+ */
+ crash_kexec();
+
#ifdef CONFIG_SMP
+ /*
+ * Note smp_send_stop is the usual smp shutdown function, which
+ * unfortunately means it may not be hardened to work in a panic
+ * situation.
+ */
smp_send_stop();
#endif
@@ -79,8 +99,7 @@ NORET_TYPE void panic(const char * fmt, ...)
if (!panic_blink)
panic_blink = no_blink;
- if (panic_timeout > 0)
- {
+ if (panic_timeout > 0) {
/*
* Delay timeout seconds before rebooting the machine.
* We can't use the "normal" timers since we just panicked..