Re: [patch 10/12] rseq: Implement rseq_grant_slice_extension()

[Thomas Gleixner <tglx@linutronix.de>]

On Tue, Sep 09 2025 at 13:44, K. Prateek Nayak wrote:

> Hello Thomas,
>
> On 9/9/2025 4:30 AM, Thomas Gleixner wrote:
>>  #else /* CONFIG_RSEQ_SLICE_EXTENSION */
>>  static inline bool rseq_slice_extension_enabled(void) { return false; }
>>  static inline bool rseq_arm_slice_extension_timer(void) { return false; }
>>  static inline void rseq_slice_clear_grant(struct task_struct *t) { }
>> +static inline bool rseq_grant_slice_extension(bool work_pending) { return false; }
>
> This is still under the CONFIG_RSEQ block and when building with
> CONFIG_RSEQ disabled gives the following error with changes from
> Patch 11:
>
>     kernel/entry/common.c:40:30: error: implicit declaration of function ‘rseq_grant_slice_extension’ [-Werror=implicit-function-declaration]
>        40 |                         if (!rseq_grant_slice_extension(ti_work & TIF_SLICE_EXT_DENY))
>
> Putting the rseq_grant_slice_extension() definition from above in
> a separate "ifndef CONFIG_RSEQ_SLICE_EXTENSION" block at the end
> keeps the build happy.

Duh, yes.