linux-kernel - Re: [PATCH v2] ipc: Update semtimedop() to use hrtimer

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Message-ID: <874k2dovpc.ffs@tglx>
Date:   Thu, 28 Apr 2022 21:26:55 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Prakash Sangappa <prakash.sangappa@...cle.com>,
        linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, peterz@...radead.org, dave@...olabs.net,
        manfred@...orfullife.com,
        Prakash Sangappa <prakash.sangappa@...cle.com>
Subject: Re: [PATCH v2] ipc: Update semtimedop() to use hrtimer

Prakash,

On Thu, Apr 28 2022 at 08:07, Prakash Sangappa wrote:
> semtimedop() should be converted to use hrtimer like it has been done
> for most of the system calls with timeouts. This system call already
> takes a struct timespec as an argument and can therefore provide finer
> granularity timed wait.

almost perfect :)

The v1->v2: description wants to be below the '---' separator. It's not
part of the changelog and just helpful for reviewers to assess the
history of the patch(set).

> v1->v2:
>   - Use timespec64_valid() to validate timeout
>      and other changes as suggested by Thomas Gleixner
>
> Signed-off-by: Prakash Sangappa <prakash.sangappa@...cle.com>
> ---
...
> @@ -2210,7 +2209,7 @@ long __do_semtimedop(int semid, struct sembuf *sops,
>  		/*
>  		 * If an interrupt occurred we have to clean up the queue.
>  		 */
> -		if (timeout && jiffies_left == 0)
> +		if (timed_out)
>  			error = -EAGAIN;
>  	} while (error == -EINTR && !signal_pending(current)); /* spurious */

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>