linux-kernel - Re: [PATCH] powerpc/64s/radix: Define arch_ioremap_p4d

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Message-ID: <87d0iztz0f.fsf@concordia.ellerman.id.au>
Date:   Thu, 27 Jun 2019 14:48:00 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-next@...r.kernel.org
Subject: Re: [PATCH] powerpc/64s/radix: Define arch_ioremap_p4d_supported()

Anshuman Khandual <anshuman.khandual@....com> writes:
> Recent core ioremap changes require HAVE_ARCH_HUGE_VMAP subscribing archs
> provide arch_ioremap_p4d_supported() failing which will result in a build
> failure like the following.
>
> ld: lib/ioremap.o: in function `.ioremap_huge_init':
> ioremap.c:(.init.text+0x3c): undefined reference to
> `.arch_ioremap_p4d_supported'
>
> This defines a stub implementation for arch_ioremap_p4d_supported() keeping
> it disabled for now to fix the build problem.

The easiest option is for this to be folded into your patch that creates
the requirement for arch_ioremap_p4d_supported().

Andrew might do that for you, or you could send a v2.

This looks fine from a powerpc POV:

Acked-by: Michael Ellerman <mpe@...erman.id.au>

cheers

> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Stephen Rothwell <sfr@...b.auug.org.au>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-next@...r.kernel.org
>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
> This has been just build tested and fixes the problem reported earlier.
>
>  arch/powerpc/mm/book3s64/radix_pgtable.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index 8904aa1..c81da88 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -1124,6 +1124,11 @@ void radix__ptep_modify_prot_commit(struct vm_area_struct *vma,
>  	set_pte_at(mm, addr, ptep, pte);
>  }
>  
> +int __init arch_ioremap_p4d_supported(void)
> +{
> +	return 0;
> +}
> +
>  int __init arch_ioremap_pud_supported(void)
>  {
>  	/* HPT does not cope with large pages in the vmalloc area */
> -- 
> 2.7.4