On Mon, Oct 07, 2024 at 12:14:15PM +0200, Michal Schmidt wrote:
> Code after the return statement is dead. Enable preemption before
> returning from srcu_drive_gp().
> 
> This will be important when/if PREEMPT_AUTO (lazy resched) gets merged.
> 
> Fixes: 65b4a59557f6 ("srcu: Make Tiny SRCU explicitly disable preemption")
> Signed-off-by: Michal Schmidt <mschm...@redhat.com>

Good catch!

Reviewed-by: Paul E. McKenney <paul...@kernel.org>

> ---
>  kernel/rcu/srcutiny.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c
> index 549c03336ee9..4dcbf8aa80ff 100644
> --- a/kernel/rcu/srcutiny.c
> +++ b/kernel/rcu/srcutiny.c
> @@ -122,8 +122,8 @@ void srcu_drive_gp(struct work_struct *wp)
>       ssp = container_of(wp, struct srcu_struct, srcu_work);
>       preempt_disable();  // Needed for PREEMPT_AUTO
>       if (ssp->srcu_gp_running || ULONG_CMP_GE(ssp->srcu_idx, 
> READ_ONCE(ssp->srcu_idx_max))) {
> -             return; /* Already running or nothing to do. */
>               preempt_enable();
> +             return; /* Already running or nothing to do. */
>       }
>  
>       /* Remove recently arrived callbacks and wait for readers. */
> -- 
> 2.46.2
> 

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