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SubjectRe: linux-next: build failure after merge of the final tree (tip/s390 trees related)
On Thu, 18 Oct 2012 17:22:01 +1100
Stephen Rothwell <sfr@canb.auug.org.au> wrote:

> Hi all,
>
> 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 http://kisskb.ellerman.id.au/kisskb/buildresult/7383823/)
>
> 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?

Subject: [PATCH] s390/thp: implement pmd_pgprot() for s390

git commit "mm/thp: Preserve pgprot across huge page split" in
linux-next introduced a pmd_pgprot() function, which is missing on
s390, resulting in a compile error when transparent huge pages are
enabled. This patch adds an implementation of pmd_pgprot() for s390.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
---
arch/s390/include/asm/pgtable.h | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index f8887ab..2846920 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1250,6 +1250,19 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
*pmdp = entry;
}

+static inline pgprot_t pmd_pgprot(pmd_t pmd)
+{
+ pgprot_t prot = PAGE_RW;
+
+ if (pmd_val(pmd) & _SEGMENT_ENTRY_RO) {
+ if (pmd_val(pmd) & _SEGMENT_ENTRY_INV)
+ prot = PAGE_NONE;
+ else
+ prot = PAGE_RO;
+ }
+ return prot;
+}
+
static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
{
unsigned long pgprot_pmd = 0;
--
1.7.11.7


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