linux-kernel - [PATCH] m68k: kill page walker compile warning

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Date:	Thu, 7 Feb 2008 09:10:37 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mikael Starvik <starvik@...s.com>
cc:	Linux/m68k <linux-m68k@...r.kernel.org>, dev-etrax@...s.com,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: [PATCH] m68k: kill page walker compile warning

The recently introduced page walker (walk_page_range()) calls pgd_offset with a
const struct mm_struct pointer, causing the following compile warning on m68k:

    mm/pagewalk.c:111: warning: passing argument 1 of 'pgd_offset' discards qualifiers from pointer target type

Make the `mm' parameter of the inline function pgd_offset() const to shut it
up.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
As cris also uses an inline function, I expect a similar warning to show up
there. All other archs use a macro to define pgd_offset.

 include/asm-m68k/motorola_pgtable.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/asm-m68k/motorola_pgtable.h
+++ b/include/asm-m68k/motorola_pgtable.h
@@ -191,7 +191,8 @@ static inline pte_t pte_mkcache(pte_t pt
 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
 
 /* to find an entry in a page-table-directory */
-static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address)
+static inline pgd_t *pgd_offset(const struct mm_struct *mm,
+				unsigned long address)
 {
 	return mm->pgd + pgd_index(address);
 }

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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