linux-kernel - Re: linux-next: Tree for Apr 19 (zcache)

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Date:	Mon, 23 Apr 2012 21:06:15 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc:	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Nitin Gupta <nitingupta910@...il.com>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: linux-next: Tree for Apr 19 (zcache)

On Fri, Apr 20, 2012 at 02:06:41PM -0500, Seth Jennings wrote:
> On 04/20/2012 11:37 AM, Konrad Rzeszutek Wilk wrote:
> > On Thu, Apr 19, 2012 at 11:36:26PM -0500, Seth Jennings wrote:
> >> One fix is this:
> >>
> >> diff --git a/drivers/staging/zcache/Kconfig b/drivers/staging/zcache/Kconfig
> >> index 3ed2c8f..7048e01 100644
> >> --- a/drivers/staging/zcache/Kconfig
> >> +++ b/drivers/staging/zcache/Kconfig
> >> @@ -2,7 +2,7 @@ config ZCACHE
> >>         bool "Dynamic compression of swap pages and clean pagecache pages"
> >>         # X86 dependency is because zsmalloc uses non-portable pte/tlb
> >>         # functions
> >> -       depends on (CLEANCACHE || FRONTSWAP) && CRYPTO && X86
> >> +       depends on (CLEANCACHE || FRONTSWAP) && CRYPTO=y && X86
> >>         select ZSMALLOC
> >>         select CRYPTO_LZO
> >>         default n
> >>
> >> I think this is the best way since ZCACHE is a bool and CRYPTO is the only
> >> one of the dependencies that is a tristate.  This forces both ZSMALLOC and
> >> CRYPTO_LZO to be builtin if ZCACHE is selected.
> >>
> >> Any other suggestions?
> > 
> > Could you do:
> > 
> > default y if (CRYPTO=y || ZSMALLOC=m)
> > default m if (CRYPTO=m || ZSMALLOC=y)
> 
> ZCACHE is a bool and can't be built as a module.

Duh!
> 
> The requirement is the if ZCACHE=y, then ZSMALLOC and
> CRYPTO must also =y.

OK, your patch makes sense then. Can you repost it please with
Greg KH on it so he can add it in the staging tree?
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