linux-kernel - [PATCH] mm,fs,dax: mark dax_iomap_pmd

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Message-Id: <20170227203349.3318733-1-arnd@arndb.de>
Date:   Mon, 27 Feb 2017 21:33:27 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Jan Kara <jack@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Chinner <dchinner@...hat.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm,fs,dax: mark dax_iomap_pmd_fault as const

The two alternative implementations of dax_iomap_fault have different
prototypes, and one of them is obviously wrong as seen from this build
warning:

fs/dax.c: In function 'dax_iomap_fault':
fs/dax.c:1462:35: error: passing argument 2 of 'dax_iomap_pmd_fault' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]

This marks the argument 'const' as in all the related functions.

Fixes: a2d581675d48 ("mm,fs,dax: change ->pmd_fault to ->huge_fault")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/dax.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index d5712f42a2e6..85479428518f 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1436,7 +1436,7 @@ 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;
 }
-- 
2.9.0