linux-kernel - [PATCH 5.14 003/169] sh: pgtable-3level: fix cast to pointer from integer of different size

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Date:   Mon, 25 Oct 2021 21:13:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Daniel Palmer <daniel@...ngy.jp>,
        Rob Landley <rob@...dley.net>,
        Yoshinori Sato <ysato@...rs.osdn.me>,
        Rich Felker <dalias@...c.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.14 003/169] sh: pgtable-3level: fix cast to pointer from integer of different size

From: Geert Uytterhoeven <geert+renesas@...der.be>

commit e8e9f1e6327005be9656aa135aeb9dfdaf6b3032 upstream.

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.

Link: https://lkml.kernel.org/r/2c2eef3c9a2f57e5609100a4864715ccf253d30f.1631713483.git.geert+renesas@glider.be
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>
Tested-by: Daniel Palmer <daniel@...ngy.jp>
Acked-by: Rob Landley <rob@...dley.net>
Cc: Yoshinori Sato <ysato@...rs.osdn.me>
Cc: Rich Felker <dalias@...c.org>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>
Cc: Jacopo Mondi <jacopo+renesas@...ndi.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/sh/include/asm/pgtable-3level.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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;
 
 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 */