linux-kernel - Re: [PATCH] staging: fix powerpc linux-next break on zsmalloc

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Date:	Tue, 14 Feb 2012 17:21:05 +0100
From:	Marc Dietrich <marvin24@....de>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc:	Greg KH <greg@...ah.com>, Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nitin Gupta <ngupta@...are.org>
Subject: Re: [PATCH] staging: fix powerpc linux-next break on zsmalloc

Hi Seth,

On Tuesday 14 February 2012 08:35:13 Seth Jennings wrote:
> On 02/14/2012 05:39 AM, Marc Dietrich wrote:
> > Am 14.02.2012 12:22, schrieb Marc Dietrich:
> >> Am 13.02.2012 15:47, schrieb Seth Jennings:
> >>> linux/vmalloc.h added to zsmalloc-main.c to resolve implicit
> >>> declaration errors.
> >>> 
> >>> X86 dependency added to zsmalloc and dependent drivers zcache and
> >>> zram.
> >>> 
> >>> This X86 only requirement is not ideal.  Working to find portable
> >>> functions for __flush_tlb_one and set_pte.
> >> 
> >> sorry, zcache/zram works fine one ARM here. Why not depend on
> >> !POWERPC?
> > 
> > ups, sorry again, I tested an older version only. flush_tlb_one and
> > set_pte is only used with the new allocator as it seems.
> 
> It would seem that the cpu-local tlb page flushing function for ARM
> is local_flush_tlb_kernel_page(), by look at the kmap_atomic() code
> in arch/arm/mm/highmem.c.
> 
> So each arch is using a slightly different approach here.
> 
> A simple #define per-arch could make a it a common call.  I think
> I'm going to code it up and see how it goes.

... and I'm happy to test it ;-)

Thanks

Marc

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