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

[K Prateek Nayak]

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.

>  #endif /* !CONFIG_RSEQ_SLICE_EXTENSION */
>  
>  bool rseq_debug_update_user_cs(struct task_struct *t, struct pt_regs *regs, unsigned long csaddr);
> 

-- 
Thanks and Regards,
Prateek