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authorPetr Tesarik <ptesarik@suse.com>2016-08-02 23:06:16 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-03 01:35:30 +0200
commit21db79e8bb054d0351a6b1b464f1c9c47a2e6e8d (patch)
treea34bbff53fad1569f11eac002eeef688ed5dd170 /kernel/ksysfs.c
parentkexec: use core_param for crash_kexec_post_notifiers boot option (diff)
downloadlinux-21db79e8bb054d0351a6b1b464f1c9c47a2e6e8d.tar.xz
linux-21db79e8bb054d0351a6b1b464f1c9c47a2e6e8d.zip
kexec: add a kexec_crash_loaded() function
Provide a wrapper function to be used by kernel code to check whether a crash kernel is loaded. It returns the same value that can be seen in /sys/kernel/kexec_crash_loaded by userspace programs. I'm exporting the function, because it will be used by Xen, and it is possible to compile Xen modules separately to enable the use of PV drivers with unmodified bare-metal kernels. Link: http://lkml.kernel.org/r/20160713121955.14969.69080.stgit@hananiah.suse.cz Signed-off-by: Petr Tesarik <ptesarik@suse.com> Cc: Juergen Gross <jgross@suse.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Eric Biederman <ebiederm@xmission.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Dave Young <dyoung@redhat.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--kernel/ksysfs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 9f1920d2d0c6..ee1bc1bb8feb 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -101,7 +101,7 @@ KERNEL_ATTR_RO(kexec_loaded);
static ssize_t kexec_crash_loaded_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", !!kexec_crash_image);
+ return sprintf(buf, "%d\n", kexec_crash_loaded());
}
KERNEL_ATTR_RO(kexec_crash_loaded);