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[PATCH] Add a sysfs file to determine if a kexec kernel is loaded

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Create two files in /sys/kernel, kexec_loaded and kexec_crash_loaded.  Each
file contains a simple boolean value indicating whether the relevant kernel
has been loaded into memory.  The motivation for this is geared around
support.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Moyer 2006-06-23 02:05:07 -07:00 • committed by Linus Torvalds
parent 24bbb1faf3
commit c330dda908
3 changed files with 23 additions and 3 deletions
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6
kernel/kexec.c
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@ -902,14 +902,14 @@ static int kimage_load_segment(struct kimage *image,
* kexec does not sync, or unmount filesystems so if you need
* that to happen you need to do that yourself.
*/
struct kimage *kexec_image = NULL;
static struct kimage *kexec_crash_image = NULL;
struct kimage *kexec_image;
struct kimage *kexec_crash_image;
/*
* A home grown binary mutex.
* Nothing can wait so this mutex is safe to use
* in interrupt context :)
*/
static int kexec_lock = 0;
static int kexec_lock;
asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
struct kexec_segment __user *segments,