linux-kernel - Re: [PATCH v2 2/2] x86: add prefetching to do

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Message-ID: <1383768458.7940.33.camel@joe-AO722>
Date:	Wed, 06 Nov 2013 12:07:38 -0800
From:	Joe Perches <joe@...ches.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Dave Jones <davej@...hat.com>, linux-kernel@...r.kernel.org,
	sebastien.dugue@...l.net, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH v2 2/2] x86: add prefetching to do_csum

On Wed, 2013-11-06 at 15:02 -0500, Neil Horman wrote:
> On Wed, Nov 06, 2013 at 09:19:23AM -0800, Joe Perches wrote:
[]
> > __always_inline instead of inline
> > static __always_inline void prefetch_lines(const void *addr, size_t len)
> > {
> > 	const void *end = addr + len;
> > ...
> > 
> > buff doesn't need a void * cast in prefetch_lines
> > 
> Actually I take back what I said here, we do need the cast, not for a conversion
> from unsigned char * to void *, but rather to discard the const qualifier
> without making the compiler complain.

Not if the function is changed to const void *
and end is also const void * as shown.


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