Re: linux-next: build failure after merge of the final tree(tip/s390 trees related)

From: Ralf Baechle
Date: Thu Oct 18 2012 - 10:51:10 EST

On Thu, Oct 18, 2012 at 05:22:01PM +1100, Stephen Rothwell wrote:

> After merging the final tree, today's linux-next build (s390 allyesconfig)
> failed like this:
> mm/huge_memory.c:1424:2: error: implicit declaration of function 'pmd_pgprot' [-Werror=implicit-function-declaration]
> mm/huge_memory.c:1424:7: error: incompatible types when assigning to type 'pgprot_t' from type 'int'
> (see
> Caused by commit 35d3d3427314 ("s390/thp: select
> HAVE_ARCH_TRANSPARENT_HUGEPAGE") from the s390 tree interacting with
> commit 93c9d633bd9e ("mm/thp: Preserve pgprot across huge page split")
> from the tip tree.
> N.B. Mips also selects HAVE_ARCH_TRANSPARENT_HUGEPAGE as of commit
> e21a828a1bba ("MIPS: Transparent Huge Pages support") from the mips tree
> and so will be broken in some configs now as well.
> Anyone have suggested merge fix patches I can apply?

See below. There's further MIPS breakage in -next; more on than in a
separate email.


Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>

arch/mips/include/asm/pgtable.h | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 252202d..5f7c615 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -534,6 +534,8 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
return pmd;

+#define pmd_pgprot(x) __pgprot(pmd_val(x) & ~_PAGE_CHG_MASK)
static inline pmd_t pmd_mknotpresent(pmd_t pmd)
pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at