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Date: Sat, 5 Mar 2016 19:05:20 -0700
From: Andreas Dilger <adilger@...ger.ca>
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org
Subject: Re: [PATCH] misc: replace comparison macros with inline functions
On Mar 5, 2016, at 17:30, Andreas Dilger <adilger@...ger.ca> wrote:
>
> Replace the EXT2FS_RB_EMPTY_ROOT(), EXT2FS_RB_EMPTY_NODE(),
> EXT2FS_RB_CLEAR_NODE(), IS_BLOCK_BM(), IS_INODE_BM(), and
> IS_INODE_TB() macros with static inline functions to avoid
> suprious compiler warnings with clang:
This should actually be llvm, not clang...
Cheers, Andreas
>
> pass1.c:618:28: warning: equality comparison with extraneous
> parentheses [-Wparentheses-equality]
> if ((*((__u32 *)(entry)) == 0UL)) {
> ~~~~~~~~~~~~~~~~~~~~^~~~~~
> pass1.c:618:28: note: remove extraneous parentheses
> around the comparison to silence this warning
> if ((*((__u32 *)(entry)) == 0UL)) {
> ^~
> pass1.c:618:28: note: use '=' to turn this equality
> comparison into an assignment
> if ((*((__u32 *)(entry)) == 0UL)) {
> ^~
> =
>
> The static inline functions should compile identically, and allow
> some extra compile-time checking for the arguments over macros.
>
> Signed-off-by: Andreas Dilger <adilger@...ger.ca>
> ---
> lib/ext2fs/blkmap64_rb.c | 10 +++++-----
> lib/ext2fs/rbtree.h | 17 ++++++++++++++---
> resize/resize2fs.c | 38 ++++++++++++++++++++++++--------------
> 3 files changed, 43 insertions(+), 22 deletions(-)
>
> diff --git a/lib/ext2fs/blkmap64_rb.c b/lib/ext2fs/blkmap64_rb.c
> index fdbd330..07d6b48 100644
> --- a/lib/ext2fs/blkmap64_rb.c
> +++ b/lib/ext2fs/blkmap64_rb.c
> @@ -490,7 +490,7 @@ static int rb_remove_extent(__u64 start, __u64 count,
> __u64 new_start, new_count;
> int retval = 0;
>
> - if (EXT2FS_RB_EMPTY_ROOT(root))
> + if (ext2fs_rb_empty_root(root))
> return 0;
>
> while (*n) {
> @@ -639,7 +639,7 @@ static int rb_test_clear_bmap_extent(ext2fs_generic_bitmap bitmap,
> n = &bp->root.rb_node;
> start -= bitmap->start;
>
> - if ((len == 0) || EXT2FS_RB_EMPTY_ROOT(&bp->root))
> + if (len == 0 || ext2fs_rb_empty_root(&bp->root))
> return 1;
>
> /*
> @@ -742,7 +742,7 @@ static errcode_t rb_get_bmap_range(ext2fs_generic_bitmap bitmap,
> n = &bp->root.rb_node;
> start -= bitmap->start;
>
> - if (EXT2FS_RB_EMPTY_ROOT(&bp->root))
> + if (ext2fs_rb_empty_root(&bp->root))
> return 0;
>
> while (*n) {
> @@ -822,7 +822,7 @@ static errcode_t rb_find_first_zero(ext2fs_generic_bitmap bitmap,
> if (start > end)
> return EINVAL;
>
> - if (EXT2FS_RB_EMPTY_ROOT(&bp->root))
> + if (ext2fs_rb_empty_root(&bp->root))
> return ENOENT;
>
> while (*n) {
> @@ -859,7 +859,7 @@ static errcode_t rb_find_first_set(ext2fs_generic_bitmap bitmap,
> if (start > end)
> return EINVAL;
>
> - if (EXT2FS_RB_EMPTY_ROOT(&bp->root))
> + if (ext2fs_rb_empty_root(&bp->root))
> return ENOENT;
>
> while (*n) {
> diff --git a/lib/ext2fs/rbtree.h b/lib/ext2fs/rbtree.h
> index 3b0b078..6aaa941 100644
> --- a/lib/ext2fs/rbtree.h
> +++ b/lib/ext2fs/rbtree.h
> @@ -142,9 +142,20 @@ static inline void ext2fs_rb_set_color(struct rb_node *rb, int color)
> #define RB_ROOT (struct rb_root) { NULL, }
> #define ext2fs_rb_entry(ptr, type, member) container_of(ptr, type, member)
>
> -#define EXT2FS_RB_EMPTY_ROOT(root) ((root)->rb_node == NULL)
> -#define EXT2FS_RB_EMPTY_NODE(node) (ext2fs_rb_parent(node) == node)
> -#define EXT2FS_RB_CLEAR_NODE(node) (ext2fs_rb_set_parent(node, node))
> +static inline int ext2fs_rb_empty_root(struct rb_root *root)
> +{
> + return root->rb_node == NULL;
> +}
> +
> +static inline int ext2fs_rb_empty_node(struct rb_node *node)
> +{
> + return ext2fs_rb_parent(node) == node;
> +}
> +
> +static inline void ext2fs_rb_clear_node(struct rb_node *node)
> +{
> + ext2fs_rb_set_parent(node, node);
> +}
>
> extern void ext2fs_rb_insert_color(struct rb_node *, struct rb_root *);
> extern void ext2fs_rb_erase(struct rb_node *, struct rb_root *);
> diff --git a/resize/resize2fs.c b/resize/resize2fs.c
> index a2806b1..dc22b9d 100644
> --- a/resize/resize2fs.c
> +++ b/resize/resize2fs.c
> @@ -58,14 +58,24 @@ static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
> ext2fs_block_bitmap meta_bmap);
>
> /*
> - * Some helper CPP macros
> + * Some helper functions to check if a block is in a metadata area
> */
> -#define IS_BLOCK_BM(fs, i, blk) ((blk) == ext2fs_block_bitmap_loc((fs),(i)))
> -#define IS_INODE_BM(fs, i, blk) ((blk) == ext2fs_inode_bitmap_loc((fs),(i)))
> +static inline int is_block_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
> +{
> + return blk == ext2fs_block_bitmap_loc(fs, grp);
> +}
>
> -#define IS_INODE_TB(fs, i, blk) (((blk) >= ext2fs_inode_table_loc((fs), (i))) && \
> - ((blk) < (ext2fs_inode_table_loc((fs), (i)) + \
> - (fs)->inode_blocks_per_group)))
> +static inline int is_inode_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
> +{
> + return blk == ext2fs_inode_bitmap_loc(fs, grp);
> +}
> +
> +static inline int is_inode_tb(ext2_filsys fs, unsigned int grp, blk64_t blk)
> +{
> + return blk >= ext2fs_inode_table_loc(fs, grp) &&
> + blk < (ext2fs_inode_table_loc(fs, grp) +
> + fs->inode_blocks_per_group);
> +}
>
> /* Some bigalloc helper macros which are more succint... */
> #define B2C(x) EXT2FS_B2C(fs, (x))
> @@ -843,7 +853,7 @@ static void mark_fs_metablock(ext2_resize_t rfs,
> ext2fs_block_bitmap meta_bmap,
> int group, blk64_t blk)
> {
> - ext2_filsys fs = rfs->new_fs;
> + ext2_filsys fs = rfs->new_fs;
>
> ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
> ext2fs_block_alloc_stats2(fs, blk, +1);
> @@ -853,17 +863,17 @@ static void mark_fs_metablock(ext2_resize_t rfs,
> * or the inode tables. If not, and the block is in use, then
> * mark it as a block to be moved.
> */
> - if (IS_BLOCK_BM(fs, group, blk)) {
> + if (is_block_bm(fs, group, blk)) {
> ext2fs_block_bitmap_loc_set(fs, group, 0);
> rfs->needed_blocks++;
> return;
> }
> - if (IS_INODE_BM(fs, group, blk)) {
> + if (is_inode_bm(fs, group, blk)) {
> ext2fs_inode_bitmap_loc_set(fs, group, 0);
> rfs->needed_blocks++;
> return;
> }
> - if (IS_INODE_TB(fs, group, blk)) {
> + if (is_inode_tb(fs, group, blk)) {
> ext2fs_inode_table_loc_set(fs, group, 0);
> rfs->needed_blocks++;
> return;
> @@ -871,18 +881,18 @@ static void mark_fs_metablock(ext2_resize_t rfs,
> if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
> dgrp_t i;
>
> - for (i=0; i < rfs->old_fs->group_desc_count; i++) {
> - if (IS_BLOCK_BM(fs, i, blk)) {
> + for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
> + if (is_block_bm(fs, i, blk)) {
> ext2fs_block_bitmap_loc_set(fs, i, 0);
> rfs->needed_blocks++;
> return;
> }
> - if (IS_INODE_BM(fs, i, blk)) {
> + if (is_inode_bm(fs, i, blk)) {
> ext2fs_inode_bitmap_loc_set(fs, i, 0);
> rfs->needed_blocks++;
> return;
> }
> - if (IS_INODE_TB(fs, i, blk)) {
> + if (is_inode_tb(fs, i, blk)) {
> ext2fs_inode_table_loc_set(fs, i, 0);
> rfs->needed_blocks++;
> return;
> --
> 1.8.0
>
--
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