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

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Message-Id: <2c2eef3c9a2f57e5609100a4864715ccf253d30f.1631713483.git.geert+renesas@glider.be>
Date:   Wed, 15 Sep 2021 15:50:04 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     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,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] sh: pgtable-3level: Fix cast to pointer from integer of different size

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.

Fixes: 9cf6fa2458443118 ("mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t *")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Compile-tested only, as the remote Migo-R is MIA.
Anyone with e.g. a Migo-R or Ecovec to boot-test?
The truncation to "unsigned long" has been there since forever, so
probably it still works fine ;-)

... once the other build issues are fixed.
---
 arch/sh/include/asm/pgtable-3level.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sh/include/asm/pgtable-3level.h b/arch/sh/include/asm/pgtable-3level.h
index 56bf35c2f29c2b83..cdced80a7ffa3944 100644
--- a/arch/sh/include/asm/pgtable-3level.h
+++ b/arch/sh/include/asm/pgtable-3level.h
@@ -34,7 +34,7 @@ typedef struct { unsigned long long pmd; } pmd_t;
 
 static inline pmd_t *pud_pgtable(pud_t pud)
 {
-	return (pmd_t *)pud_val(pud);
+	return (pmd_t *)(unsigned long)pud_val(pud);
 }
 
 /* only used by the stubbed out hugetlb gup code, should never be called */
-- 
2.25.1