linux-kernel - Re: [PATCH] hid-core: fix s32 to n function when n=32

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Message-ID: <alpine.LNX.2.00.1505291646230.26271@pobox.suse.cz>
Date:	Fri, 29 May 2015 16:47:43 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	"Samet, Yael" <yael.samet@...el.com>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hid-core: fix s32 to n function when n=32

On Thu, 21 May 2015, Samet, Yael wrote:

> In hid-core.c, s32ton function, when n in 32 the result will always be 0.
> In the last line of the function:
> 1 << 32 is not defined,
> I get 1 in my environment, Then ((1 << n) - 1) is 0, and the function returns 0 for each value.
> 
> Signed-off-by: Yael Samet <yael.samet@...el.com>
> 
> --- hid-core.c      2015-05-21 10:49:39.000000000 +0300
> +++ hid-core.c.pathced 2015-05-21 11:02:29.692431045 +0300

This is not a proper format to submit patches, please see 
Documentation/SubmittingPatches.

> @@ -1044,6 +1044,8 @@
> static u32 s32ton(__s32 value, unsigned n)
> {
>                s32 a = value >> (n - 1);
> +             if (n == 32)
> +                             return value;
>                if (a && a != -1)
>                                return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1;
>                return value & ((1 << n) - 1);

The patch is whitespace-damaged. Could you please fix your mail setup and 
resend?

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> Intel Israel (74) Limited
> 
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Seems like I wouldn't be allowed to apply it anyway though :p

-- 
Jiri Kosina
SUSE Labs
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