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

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Message-ID: <878rrpwsxx.ffs@tglx>
Date:   Thu, 28 Apr 2022 09:47:06 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Prakash Sangappa <prakash.sangappa@...cle.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "peterz@...radead.org" <peterz@...radead.org>
Subject: Re: [PATCH] ipc: Update semtimedop() to use hrtimer

On Wed, Apr 27 2022 at 23:42, Prakash Sangappa wrote:
>> On Apr 27, 2022, at 3:06 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> Converting to ktime first makes this cheaper:
>> 
>>                expires = ktime_get() + timespec64_to_ns(timeout);
>
> Since user provided timespec is added to current time, shouldn’t it check for overflow?
>
> So, perhaps 
>
> 		expires = ktime_add_safe(ktime_get(), timespec64_to_ns(timeout));

Of course. This was just for illustration and I assumed you figure it
out, which you did. :)

Thanks,

        tglx