Re: [PATCH] kernel/profile: remove setup_profiling_timer

On 21 August 2026 10:17:44 BST, Anthony Iliopoulos <[email protected]> wrote:
>No architecture uses setup_profiling_timer() at this point for setting a
>multiplier, so it can be safely removed. This allows arch-specific stub
>functions to be cleaned up in subsequent commits.

ack.

>There are no functional changes, as writing to /proc/profile will still
>reset the counters.

Ok.


Reviewed-by: Bradley Morgan <[email protected]>

(Good this is getting burnt)


>Signed-off-by: Anthony Iliopoulos <[email protected]>
>---
> include/linux/profile.h |  1 -
> kernel/profile.c        | 20 --------------------
> 2 files changed, 21 deletions(-)
>
>diff --git a/include/linux/profile.h b/include/linux/profile.h
>index 3f53cdb0c27c..68edf60173b9 100644
>--- a/include/linux/profile.h
>+++ b/include/linux/profile.h
>@@ -32,7 +32,6 @@ extern int prof_on __read_mostly;
> int profile_init(void);
> int profile_setup(char *str);
> void profile_tick(int type);
>-int setup_profiling_timer(unsigned int multiplier);
> 
> /*
>  * Add multiple profiler hits to a given address:
>diff --git a/kernel/profile.c b/kernel/profile.c
>index 1fcf1adcf4eb..5002ea558951 100644
>--- a/kernel/profile.c
>+++ b/kernel/profile.c
>@@ -177,32 +177,12 @@ read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
> 	return read;
> }
> 
>-/* default is to not implement this call */
>-int __weak setup_profiling_timer(unsigned mult)
>-{
>-	return -EINVAL;
>-}
>-
> /*
>  * Writing to /proc/profile resets the counters
>- *
>- * Writing a 'profiling multiplier' value into it also re-sets the profiling
>- * interrupt frequency, on architectures that support this.
>  */
> static ssize_t write_profile(struct file *file, const char __user *buf,
> 			     size_t count, loff_t *ppos)
> {
>-#ifdef CONFIG_SMP
>-	if (count == sizeof(int)) {
>-		unsigned int multiplier;
>-
>-		if (copy_from_user(&multiplier, buf, sizeof(int)))
>-			return -EFAULT;
>-
>-		if (setup_profiling_timer(multiplier))
>-			return -EINVAL;
>-	}
>-#endif
> 	memset(prof_buffer, 0, prof_len * sizeof(atomic_t));
> 	return count;
> }
>

Thanks!