TononixOS/ubports_kernel_google_msm
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

xfs: byteswap constants instead of variables

Browse Source 
Micro-optimize various comparisms by always byteswapping the constant
instead of the variable, which allows to do the swap at compile instead
of runtime.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Christoph Hellwig
2011-07-08 14:36:05 +02:00
parent 218106a110
commit 69ef921b55
15 changed files with 208 additions and 197 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
fs/xfs/xfs_ialloc.c
View File

@@ -683,7 +683,7 @@ xfs_dialloc(
return 0;
}
agi = XFS_BUF_TO_AGI(agbp);
ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC));
} else {
/*
* Continue where we left off before. In this case, we
@@ -691,7 +691,7 @@ xfs_dialloc(
*/
agbp = *IO_agbp;
agi = XFS_BUF_TO_AGI(agbp);
ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC));
ASSERT(be32_to_cpu(agi->agi_freecount) > 0);
}
mp = tp->t_mountp;
@@ -775,7 +775,7 @@ nextag:
if (error)
goto nextag;
agi = XFS_BUF_TO_AGI(agbp);
ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC));
}
/*
* Here with an allocation group that has a free inode.
@@ -944,7 +944,7 @@ nextag:
* See if the most recently allocated block has any free.
*/
newino:
if (be32_to_cpu(agi->agi_newino) != NULLAGINO) {
if (agi->agi_newino != cpu_to_be32(NULLAGINO)) {
error = xfs_inobt_lookup(cur, be32_to_cpu(agi->agi_newino),
XFS_LOOKUP_EQ, &i);
if (error)
@@ -1085,7 +1085,7 @@ xfs_difree(
return error;
}
agi = XFS_BUF_TO_AGI(agbp);
ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC));
ASSERT(agbno < be32_to_cpu(agi->agi_length));
/*
* Initialize the cursor.
@@ -1438,7 +1438,7 @@ xfs_ialloc_log_agi(
xfs_agi_t *agi; /* allocation group header */
agi = XFS_BUF_TO_AGI(bp);
ASSERT(be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC);
ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC));
#endif
/*
* Compute byte offsets for the first and last fields.
@@ -1492,7 +1492,7 @@ xfs_read_agi(
/*
* Validate the magic number of the agi block.
*/
agi_ok = be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC &&
agi_ok = agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC) &&
XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)) &&
be32_to_cpu(agi->agi_seqno) == agno;
if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IALLOC_READ_AGI,