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authorDavid Woodhouse <dwmw2@infradead.org>2006-05-15 00:49:43 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2006-05-15 00:49:43 +0100
commit3e68fbb59b3d4e6b47b65e9928b5929e02179759 (patch)
tree6ff2574161328a89f81f637ac42ce639e8ba31d3 /include/linux
parent52239da1b06ff445bf71d35e04d8ce74e4c6fe7b (diff)
[JFFS2] Don't pack on-medium structures, because GCC emits crappy code
If we use __attribute__((packed)), GCC will _also_ assume that the structures aren't sensibly aligned, and it'll emit code to cope with that instead of straight word load/save. This can be _very_ suboptimal on architectures like ARM. Ideally, we want an attribute which just tells GCC not to do any padding, without the alignment side-effects. In the absense of that, we'll just drop the 'packed' attribute and hope that everything stays as it was (which to be fair is fairly much what we expect). And add some paranoia checks in the initialisation code, which should be optimised away completely in the normal case. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/jffs2.h14
1 files changed, 7 insertions, 7 deletions
diff --git a/include/linux/jffs2.h b/include/linux/jffs2.h
index cf792bb3c726..228ad72f7dd8 100644
--- a/include/linux/jffs2.h
+++ b/include/linux/jffs2.h
@@ -82,15 +82,15 @@
typedef struct {
uint32_t v32;
-} __attribute__((packed)) jint32_t;
+} jint32_t;
typedef struct {
uint32_t m;
-} __attribute__((packed)) jmode_t;
+} jmode_t;
typedef struct {
uint16_t v16;
-} __attribute__((packed)) jint16_t;
+} jint16_t;
struct jffs2_unknown_node
{
@@ -99,7 +99,7 @@ struct jffs2_unknown_node
jint16_t nodetype;
jint32_t totlen; /* So we can skip over nodes we don't grok */
jint32_t hdr_crc;
-} __attribute__((packed));
+};
struct jffs2_raw_dirent
{
@@ -117,7 +117,7 @@ struct jffs2_raw_dirent
jint32_t node_crc;
jint32_t name_crc;
uint8_t name[0];
-} __attribute__((packed));
+};
/* The JFFS2 raw inode structure: Used for storage on physical media. */
/* The uid, gid, atime, mtime and ctime members could be longer, but
@@ -149,7 +149,7 @@ struct jffs2_raw_inode
jint32_t data_crc; /* CRC for the (compressed) data. */
jint32_t node_crc; /* CRC for the raw inode (excluding data) */
uint8_t data[0];
-} __attribute__((packed));
+};
struct jffs2_raw_summary
{
@@ -163,7 +163,7 @@ struct jffs2_raw_summary
jint32_t sum_crc; /* summary information crc */
jint32_t node_crc; /* node crc */
jint32_t sum[0]; /* inode summary info */
-} __attribute__((packed));
+};
union jffs2_node_union
{