[PATCH] PM: hibernate: Add stub for pm_hibernate_is_recovering()

[Mario Limonciello <superm1@kernel.org>]

From: Mario Limonciello <mario.limonciello@amd.com>

Randy reports that amdgpu fails to compile with the following error:
ERROR: modpost: "pm_hibernate_is_recovering" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!

This happens because pm_hibernate_is_recovering() is only compiled when
CONFIG_PM_SLEEP is set.  Add a stub for it so that drivers don't need
to depend upon CONFIG_PM.

Cc: Samuel Zhang <guoqing.zhang@amd.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Closes: https://lore.kernel.org/dri-devel/CAJZ5v0h1CX+aTu7dFy6vB-9LM6t5J4rt7Su3qVnq1xx-BFAm=Q@mail.gmail.com/T/#m2b9fe212b35fde11d58fcbc4e0727bc02ebba7b0
Fixes: c2aaddbd2dede ("PM: hibernate: add new api pm_hibernate_is_recovering()")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 include/linux/suspend.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 293137210fdf4..b4f1d1f781df6 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -401,6 +401,7 @@ int hibernate_quiet_exec(int (*func)(void *data), void *data);
 int hibernate_resume_nonboot_cpu_disable(void);
 int arch_hibernation_header_save(void *addr, unsigned int max_size);
 int arch_hibernation_header_restore(void *addr);
+bool pm_hibernate_is_recovering(void);
 
 #else /* CONFIG_HIBERNATION */
 static inline void register_nosave_region(unsigned long b, unsigned long e) {}
@@ -416,6 +417,7 @@ static inline bool hibernation_available(void) { return false; }
 static inline int hibernate_quiet_exec(int (*func)(void *data), void *data) {
 	return -ENOTSUPP;
 }
+static inline bool pm_hibernate_is_recovering(void) { return false; }
 #endif /* CONFIG_HIBERNATION */
 
 int arch_resume_nosmt(void);
@@ -426,7 +428,6 @@ int is_hibernate_resume_dev(dev_t dev);
 static inline int is_hibernate_resume_dev(dev_t dev) { return 0; }
 #endif
 
-bool pm_hibernate_is_recovering(void);
 
 /* Hibernation and suspend events */
 #define PM_HIBERNATION_PREPARE	0x0001 /* Going to hibernate */
-- 
2.43.0