linux-kernel - Re: [PATCH] sh: pgtable-3level: Fix cast to pointer from integer of different size

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Date:   Thu, 23 Sep 2021 17:20:43 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Daniel Palmer <daniel@...f.com>, linux-sh@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: pgtable-3level: Fix cast to pointer from integer of
 different size

Hi Geert!

On 9/15/21 15:50, Geert Uytterhoeven wrote:
> If X2TLB=y (CPU_SHX2=y or CPU_SHX3=y, e.g. migor_defconfig), pgd_t.pgd
> is "unsigned long long", causing:
> 
>     In file included from arch/sh/include/asm/pgtable.h:13,
> 		     from include/linux/pgtable.h:6,
> 		     from include/linux/mm.h:33,
> 		     from arch/sh/kernel/asm-offsets.c:14:
>     arch/sh/include/asm/pgtable-3level.h: In function ‘pud_pgtable’:
>     arch/sh/include/asm/pgtable-3level.h:37:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
>        37 |  return (pmd_t *)pud_val(pud);
> 	  |         ^
> 
> Fix this by adding an intermediate cast to "unsigned long", which is
> basically what the old code did before.

Thanks a lot for fixing this. My SH kernel build becomes much less noisy with
your patch. I can also confirm that it doesn't break the boot on my SH-7785LCR
as expected.

Tested-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
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