diff options
| author | Denis Vlasenko <vda.linux@googlemail.com> | 2007-12-02 08:35:37 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2007-12-02 08:35:37 +0000 |
| commit | ab801874f852312787c049272c20b14e06ed8195 (patch) | |
| tree | 1cfd38cfe48ed6a6625ce559ab7f3e5778a980be /util-linux | |
| parent | 8003e266edbc0ec62a586dd70dcc80dc13e2dbf0 (diff) | |
| download | busybox-ab801874f852312787c049272c20b14e06ed8195.tar.gz | |
attack the biggest stack users:
-mkfs_minix_main [busybox_unstripped]: 4288
-mkfs_minix_main [busybox_unstripped]: 4276
-grave [busybox_unstripped]: 4260
(bzip2 users too - not listed)
price we pay in code size increase:
mainSort 2458 2515 +57
grave 1005 1058 +53
sendMTFValues 2177 2195 +18
BZ2_blockSort 122 125 +3
mkfs_minix_main 3070 3022 -48
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/1 up/down: 131/-48) Total: 83 bytes
Diffstat (limited to 'util-linux')
| -rw-r--r-- | util-linux/mkfs_minix.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/util-linux/mkfs_minix.c b/util-linux/mkfs_minix.c index de9dde32b..35c0ccf5c 100644 --- a/util-linux/mkfs_minix.c +++ b/util-linux/mkfs_minix.c @@ -109,16 +109,22 @@ struct globals { unsigned long req_nr_inodes; unsigned currently_testing; - char root_block[BLOCK_SIZE]; char super_block_buffer[BLOCK_SIZE]; char boot_block_buffer[512]; unsigned short good_blocks_table[MAX_GOOD_BLOCKS]; /* check_blocks(): buffer[] was the biggest static in entire bbox */ char check_blocks_buffer[BLOCK_SIZE * TEST_BUFFER_BLOCKS]; -}; + unsigned short ind_block1[BLOCK_SIZE >> 1]; + unsigned short dind_block1[BLOCK_SIZE >> 1]; + unsigned long ind_block2[BLOCK_SIZE >> 2]; + unsigned long dind_block2[BLOCK_SIZE >> 2]; +}; #define G (*ptr_to_globals) +#define INIT_G() do { \ + PTR_TO_GLOBALS = xzalloc(sizeof(G)); \ +} while (0) static ALWAYS_INLINE unsigned div_roundup(unsigned size, unsigned n) { @@ -306,8 +312,12 @@ static void make_bad_inode(void) struct minix1_inode *inode = &INODE_BUF1[MINIX_BAD_INO]; int i, j, zone; int ind = 0, dind = 0; + /* moved to globals to reduce stack usage unsigned short ind_block[BLOCK_SIZE >> 1]; unsigned short dind_block[BLOCK_SIZE >> 1]; + */ +#define ind_block (G.ind_block1) +#define dind_block (G.dind_block1) #define NEXT_BAD (zone = next(zone)) @@ -351,6 +361,8 @@ static void make_bad_inode(void) write_block(ind, (char *) ind_block); if (dind) write_block(dind, (char *) dind_block); +#undef ind_block +#undef dind_block } #if ENABLE_FEATURE_MINIX2 @@ -359,8 +371,12 @@ static void make_bad_inode2(void) struct minix2_inode *inode = &INODE_BUF2[MINIX_BAD_INO]; int i, j, zone; int ind = 0, dind = 0; + /* moved to globals to reduce stack usage unsigned long ind_block[BLOCK_SIZE >> 2]; unsigned long dind_block[BLOCK_SIZE >> 2]; + */ +#define ind_block (G.ind_block2) +#define dind_block (G.dind_block2) if (!G.badblocks) return; @@ -401,6 +417,8 @@ static void make_bad_inode2(void) write_block(ind, (char *) ind_block); if (dind) write_block(dind, (char *) dind_block); +#undef ind_block +#undef dind_block } #else void make_bad_inode2(void); @@ -613,7 +631,7 @@ int mkfs_minix_main(int argc, char **argv) char *str_i, *str_n; char *listfile = NULL; - PTR_TO_GLOBALS = xzalloc(sizeof(G)); + INIT_G(); /* default (changed to 30, per Linus's suggestion, Sun Nov 21 08:05:07 1993) */ G.namelen = 30; G.dirsize = 32; |