Re: [PATCH v1] PM: hibernate: Fix pm_hibernation_mode_is_suspend() build breakage

[Mario Limonciello <superm1@kernel.org>]

On 9/26/25 6:10 AM, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Commit 495c8d35035e ("PM: hibernate: Add pm_hibernation_mode_is_suspend()")
> that introduced pm_hibernation_mode_is_suspend() did not define it in
> the case when CONFIG_HIBERNATION is unset, but CONFIG_SUSPEND is set.
> 
> Subsequent commit 0a6e9e098fcc ("drm/amd: Fix hybrid sleep") made the
> amdgpu driver use that function which led to kernel build breakage in
> the case mentioned above [1].
> 
> Address this by using appropriate #ifdeffery aroung the definition of
> pm_hibernation_mode_is_suspend().
> 
> Fixes: 0a6e9e098fcc ("drm/amd: Fix hybrid sleep")
> Reported-by: KernelCI bot <bot@kernelci.org>
> Closes: https://groups.io/g/kernelci-results/topic/regression_pm_testing/115439919 [1]
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>> ---
>   include/linux/suspend.h |    8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
> 
> --- a/include/linux/suspend.h
> +++ b/include/linux/suspend.h
> @@ -276,7 +276,6 @@ extern void arch_suspend_enable_irqs(voi
>   
>   extern int pm_suspend(suspend_state_t state);
>   extern bool sync_on_suspend_enabled;
> -bool pm_hibernation_mode_is_suspend(void);
>   #else /* !CONFIG_SUSPEND */
>   #define suspend_valid_only_mem	NULL
>   
> @@ -289,7 +288,6 @@ static inline bool pm_suspend_via_firmwa
>   static inline bool pm_resume_via_firmware(void) { return false; }
>   static inline bool pm_suspend_no_platform(void) { return false; }
>   static inline bool pm_suspend_default_s2idle(void) { return false; }
> -static inline bool pm_hibernation_mode_is_suspend(void) { return false; }
>   
>   static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
>   static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
> @@ -420,6 +418,12 @@ static inline int hibernate_quiet_exec(i
>   }
>   #endif /* CONFIG_HIBERNATION */
>   
> +#if defined(CONFIG_HIBERNATION) && defined(CONFIG_SUSPEND)
> +bool pm_hibernation_mode_is_suspend(void);
> +#else
> +static inline bool pm_hibernation_mode_is_suspend(void) { return false; }
> +#endif
> +
>   int arch_resume_nosmt(void);
>   
>   #ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
> 
> 
>