linux-kernel - Re: [PATCH] bitops: Provide generic sign_extend function (moving it out from wireless code)

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Message-ID: <87k4ncic46.fsf@basil.nowhere.org>
Date:	Fri, 27 Aug 2010 12:27:53 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andreas Herrmann <herrmann.der.user@...glemail.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Borislav Petkov <borislav.petkov@....com>,
	Zhu Yi <yi.zhu@...el.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>
Subject: Re: [PATCH] bitops: Provide generic sign_extend function (moving it out from wireless code)

Andreas Herrmann <herrmann.der.user@...glemail.com> writes:
>  
> +/**
> + * sign_extend - Sign extend a value using specified bit as sign-bit
> + * @value: value to sign extend
> + * @index: 0 based bit index (0<=index<32) to sign bit
> + */
> +static inline __s32 sign_extend(__u32 value, int index)
> +{
> +	__u8 shift = 31 - index;
> +	return (__s32)(value << shift) >> shift;
> +}

If it only handles 32bit please call it sign_extend32

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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