linux-kernel - [PATCH] mm: fix ptep_modify

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Date:	Tue, 15 Jul 2008 13:39:07 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mike Frysinger <vapier.adi@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>, Adrian Bunk <bunk@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] mm: fix ptep_modify_* for no-MMU systems

Fixes build problem: 
 the functions added to asm-generic/pgtable.h are only used by
 mm/mprotect.c (a MMU-only file), but they were not added inside of the
 CONFIG_MMU ifdef block.  since the functions rely on things inside of
 CONFIG_MMU (the lines just above in pgtable.h), we get build failure
 on all no-mmu setups:
   CC      init/main.o
 In file included from include/asm/pgtable.h:94,
                  from include/linux/mm.h:39,
                  from include/asm/dma.h:39,
                  from include/linux/bootmem.h:8,
                  from init/main.c:27:
 include/asm-generic/pgtable.h: In function '__ptep_modify_prot_start':
 include/asm-generic/pgtable.h:210: error: implicit declaration of
 function 'ptep_get_and_clear'
 include/asm-generic/pgtable.h:210: error: incompatible types in return
 make[1]: *** [init/main.o] Error 1
 make: *** [init/main.o] Error 2

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: Adrian Bunk <bunk@...nel.org>
Cc: Mike Frysinger <vapier.adi@...il.com>
---
 include/asm-generic/pgtable.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

===================================================================
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -195,7 +195,6 @@
 	}
 	return 0;
 }
-#endif /* CONFIG_MMU */
 
 static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm,
 					     unsigned long addr,
@@ -253,6 +252,7 @@
 	__ptep_modify_prot_commit(mm, addr, ptep, pte);
 }
 #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */
+#endif /* CONFIG_MMU */
 
 /*
  * A facility to provide lazy MMU batching.  This allows PTE updates and



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