linux-kernel - Re: [PATCH v2 10/17] signal: make has_pending

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Message-ID: <20180601161657.GD1058@redhat.com>
Date:   Fri, 1 Jun 2018 18:16:58 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Christian Brauner <christian@...uner.io>
Cc:     linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
        gregkh@...uxfoundation.org, mingo@...nel.org,
        james.morris@...rosoft.com, keescook@...omium.org,
        peterz@...radead.org, sds@...ho.nsa.gov, viro@...iv.linux.org.uk,
        akpm@...ux-foundation.org
Subject: Re: [PATCH v2 10/17] signal: make has_pending_signals() return bool

On 06/01, Christian Brauner wrote:
>
> has_pending_signals() already behaves like a boolean function. Let's
> actually declare it as such too.

But this patch does more.

> -	case 4: ready  = signal->sig[3] &~ blocked->sig[3];
> -		ready |= signal->sig[2] &~ blocked->sig[2];
> -		ready |= signal->sig[1] &~ blocked->sig[1];
> -		ready |= signal->sig[0] &~ blocked->sig[0];
> +	case 4:
> +		ready = signal->sig[3] & ~blocked->sig[3];
> +		ready |= signal->sig[2] & ~blocked->sig[2];
> +		ready |= signal->sig[1] & ~blocked->sig[1];
> +		ready |= signal->sig[0] & ~blocked->sig[0];
>  		break;

Again, personally I do not care at all. But why do you think the code looks
better after re-formatting? This is subjective, but to me it does not.

In particular, note the extra space before "=" removed by this patch. I guess
it was added on purpose, and to me

	ready  = signal->sig[3] &~ blocked->sig[3];
	ready |= signal->sig[2] &~ blocked->sig[2];

actually looks better thab

	ready = signal->sig[3] &~ blocked->sig[3];
	ready |= signal->sig[2] &~ blocked->sig[2];

after your patch.

Oleg.