[PATCH] fs, dax: fix build warning for !CONFIG_FS_DAX_PMD case for dax_iomap_pmd_fault

[Dave Jiang <dave.jiang@intel.com>]

Stephen reported:
With just Linus' tree, today's linux-next build (powerpc ppc64_defconfig)
produced this warning:

fs/dax.c: In function 'dax_iomap_fault':
fs/dax.c:1462:35: warning: passing argument 2 of 'dax_iomap_pmd_fault' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
   return dax_iomap_pmd_fault(vmf, ops);
                                   ^
fs/dax.c:1439:12: note: expected 'struct iomap_ops *' but argument is of type 'const struct iomap_ops *'
 static int dax_iomap_pmd_fault(struct vm_fault *vmf, struct iomap_ops *ops)
            ^

Introduced by

  commit a2d581675d48 ("mm,fs,dax: change ->pmd_fault to ->huge_fault")

which missed fixing up the !CONFIG_FS_DAX_PMD case.


Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 fs/dax.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index 5ae8b71..7436c98 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1436,7 +1436,8 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
 	return result;
 }
 #else
-static int dax_iomap_pmd_fault(struct vm_fault *vmf, struct iomap_ops *ops)
+static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+			       const struct iomap_ops *ops)
 {
 	return VM_FAULT_FALLBACK;
 }

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