linux-kernel - Re: linux-next: build failure after merge of the akpm-current tree

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Message-ID: <9e850319-8564-5b1f-2e1b-7d327215043f@arm.com>
Date:   Wed, 26 Jun 2019 17:32:18 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the akpm-current tree

Hello Stephen,

On 06/26/2019 05:11 PM, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the akpm-current tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
> 
> ld: lib/ioremap.o: in function `.ioremap_huge_init':
> ioremap.c:(.init.text+0x3c): undefined reference to `.arch_ioremap_p4d_supported'

I believe this might be caused by a patch for powerpc enabling HAVE_ARCH_HUGE_VMAP
without an arch_ioremap_p4d_supported() definition.

> 
> Caused by commit
> 
>   749940680d0b ("mm/ioremap: probe platform for p4d huge map support")
> 
> I have reverted that commit for today.

All it needs is a powerpc definition for arch_ioremap_p4d_supported() which can just
return false if it is not supported. Shall I send a patch for the powerpc fix or just
re-spin the original patch which added arch_ioremap_p4d_supported(). Please suggest.

Today's linux-next (next-20190625) does not have powerpc subscribing HAVE_ARCH_HUGE_VMAP.
Could you please point to the branch I should pull for this failure. Thanks !

- Anshuman