linux-kernel - Re: [PATCH] staging: zsmalloc: Fix link error on ARM

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Date:	Wed, 27 Mar 2013 00:03:59 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	devel@...verdev.osuosl.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: zsmalloc: Fix link error on ARM

On Tue, Mar 26, 2013 at 03:45:36PM -0700, Greg Kroah-Hartman wrote:
> On Tue, Mar 26, 2013 at 11:33:52PM +0100, Joerg Roedel wrote:
> > Testing the arm chromebook config against the upstream
> > kernel produces a linker error for the zsmalloc module from
> > staging. The symbol flush_tlb_kernel_range is not available
> > there. Fix this by removing the reimplementation of
> > unmap_kernel_range in the zsmalloc module and using the
> > function directly.
> > 
> > Signed-off-by: Joerg Roedel <joro@...tes.org>
> 
> Why is this not an error for any other architecture?  Why is arm
> special?

The version of the function __zs_unmap_object() which uses
flush_tlb_kernel_range() in the zsmalloc driver is only compiled in when
USE_PGTABLE_MAPPING is defined. And USE_PGTABLE_MAPPING is defined in
the same file only when CONFIG_ARM is defined. So this happens only on
ARM.

Regards,

	Joerg


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