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| author |   Petr Tesarik <ptesarik@suse.com> | 2016-08-02 14:06:16 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-02 19:35:30 -0400 |
| commit | 21db79e8bb054d0351a6b1b464f1c9c47a2e6e8d (patch) | |
| tree | a34bbff53fad1569f11eac002eeef688ed5dd170 /include | |
| parent | kexec: use core_param for crash_kexec_post_notifiers boot option (diff) | |
| download | linux-dev-21db79e8bb054d0351a6b1b464f1c9c47a2e6e8d.tar.xz linux-dev-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 'include')
| -rw-r--r-- | include/linux/kexec.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 23e14a460cfb..d7437777baaa 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -230,6 +230,7 @@ extern void *kexec_purgatory_get_symbol_addr(struct kimage *image, extern void __crash_kexec(struct pt_regs *); extern void crash_kexec(struct pt_regs *); int kexec_should_crash(struct task_struct *); +int kexec_crash_loaded(void); void crash_save_cpu(struct pt_regs *regs, int cpu); void crash_save_vmcoreinfo(void); void arch_crash_save_vmcoreinfo(void); @@ -364,6 +365,7 @@ struct task_struct; static inline void __crash_kexec(struct pt_regs *regs) { } static inline void crash_kexec(struct pt_regs *regs) { } static inline int kexec_should_crash(struct task_struct *p) { return 0; } +static inline int kexec_crash_loaded(void) { return 0; } #define kexec_in_progress false #endif /* CONFIG_KEXEC_CORE */ |