linux-kernel - [PATCH 1/2] gfs2: fix bitmap declaration

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Date:	Sat,  2 Mar 2013 23:31:34 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	cluster-devel@...hat.com
Subject: [PATCH 1/2] gfs2: fix bitmap declaration

The bitmap accessed by bitops like set_bit_le and clear_bit_le must
be aligned to the size of an "unsigned long".  But there are bitmaps
that are declared as char array.

This converts these bitmaps to properly declared ones.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Steven Whitehouse <swhiteho@...hat.com>
Cc: cluster-devel@...hat.com
---
 fs/gfs2/lock_dlm.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index 9802de0..ead5b36 100644
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -464,7 +464,7 @@ static void gdlm_cancel(struct gfs2_glock *gl)
 #define JID_BITMAP_OFFSET 8 /* 4 byte generation number + 4 byte unused */
 
 static void control_lvb_read(struct lm_lockstruct *ls, uint32_t *lvb_gen,
-			     char *lvb_bits)
+			     void *lvb_bits)
 {
 	uint32_t gen;
 	memcpy(lvb_bits, ls->ls_control_lvb, GDLM_LVB_SIZE);
@@ -473,7 +473,7 @@ static void control_lvb_read(struct lm_lockstruct *ls, uint32_t *lvb_gen,
 }
 
 static void control_lvb_write(struct lm_lockstruct *ls, uint32_t lvb_gen,
-			      char *lvb_bits)
+			      void *lvb_bits)
 {
 	uint32_t gen;
 	memcpy(ls->ls_control_lvb, lvb_bits, GDLM_LVB_SIZE);
@@ -481,11 +481,11 @@ static void control_lvb_write(struct lm_lockstruct *ls, uint32_t lvb_gen,
 	memcpy(ls->ls_control_lvb, &gen, sizeof(uint32_t));
 }
 
-static int all_jid_bits_clear(char *lvb)
+static int all_jid_bits_clear(void *lvb)
 {
 	int i;
 	for (i = JID_BITMAP_OFFSET; i < GDLM_LVB_SIZE; i++) {
-		if (lvb[i])
+		if (((char *)lvb)[i])
 			return 0;
 	}
 	return 1;
@@ -580,7 +580,7 @@ static void gfs2_control_func(struct work_struct *work)
 {
 	struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_control_work.work);
 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
-	char lvb_bits[GDLM_LVB_SIZE];
+	DECLARE_BITMAP(lvb_bits, GDLM_LVB_SIZE * BITS_PER_BYTE);
 	uint32_t block_gen, start_gen, lvb_gen, flags;
 	int recover_set = 0;
 	int write_lvb = 0;
@@ -758,7 +758,7 @@ static void gfs2_control_func(struct work_struct *work)
 static int control_mount(struct gfs2_sbd *sdp)
 {
 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
-	char lvb_bits[GDLM_LVB_SIZE];
+	DECLARE_BITMAP(lvb_bits, GDLM_LVB_SIZE * BITS_PER_BYTE);
 	uint32_t start_gen, block_gen, mount_gen, lvb_gen;
 	int mounted_mode;
 	int retries = 0;
@@ -949,7 +949,7 @@ static int dlm_recovery_wait(void *word)
 static int control_first_done(struct gfs2_sbd *sdp)
 {
 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
-	char lvb_bits[GDLM_LVB_SIZE];
+	DECLARE_BITMAP(lvb_bits, GDLM_LVB_SIZE * BITS_PER_BYTE);
 	uint32_t start_gen, block_gen;
 	int error;
 
-- 
1.8.1.2

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