diff options
Diffstat (limited to 'kernel/kexec_internal.h')
| -rw-r--r-- | kernel/kexec_internal.h | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/kernel/kexec_internal.h b/kernel/kexec_internal.h index 39d30ccf8d87..74da1409cd14 100644 --- a/kernel/kexec_internal.h +++ b/kernel/kexec_internal.h @@ -13,9 +13,20 @@ void kimage_terminate(struct kimage *image); int kimage_is_destination_range(struct kimage *image, unsigned long start, unsigned long end); -int machine_kexec_post_load(struct kimage *image); - -extern struct mutex kexec_mutex; +/* + * Whatever is used to serialize accesses to the kexec_crash_image needs to be + * NMI safe, as __crash_kexec() can happen during nmi_panic(), so here we use a + * "simple" atomic variable that is acquired with a cmpxchg(). + */ +extern atomic_t __kexec_lock; +static inline bool kexec_trylock(void) +{ + return atomic_cmpxchg_acquire(&__kexec_lock, 0, 1) == 0; +} +static inline void kexec_unlock(void) +{ + atomic_set_release(&__kexec_lock, 0); +} #ifdef CONFIG_KEXEC_FILE #include <linux/purgatory.h> |