linux-kernel - Re: [PATCH] mtd: fix mtd_blkdevs problem with caches on some architectures (2.6.31)

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Date:	Sun, 22 Nov 2009 09:53:50 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Ilya Loginov <isloginov@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Peter Horton <phorton@...box.co.uk>,
	"Ed L. Cashin" <ecashin@...aid.com>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH] mtd: fix mtd_blkdevs problem with caches on some
 architectures (2.6.31)

On Sun, 2009-11-22 at 12:46 +0300, Ilya Loginov wrote:
> 
> +#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
>  #define flush_dcache_page(page)                        do { } while (0)
>  #define flush_dcache_mmap_lock(mapping)                do { } while (0)
>  #define flush_dcache_mmap_unlock(mapping)      do { } while (0) 

The thing is, having a function called flush_dcache_page() which doesn't
actually flush a page of the dcache is just blatantly stupid.

It's misnamed -- it should probably be called something like
'flush_valiased_dcache_page()' or 'unalias_dcache_page()' instead, since
I believe it's only supposed to cope with aliasing issues with virtually
indexed caches.

If you're talking about _extending_ the existing silly name to a new
ARCH_IMPLEMENTS_FOO macro or Kconfig option, perhaps this would be a
good time to fix the nomenclature, rather than propagating the error?

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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