A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 11:11:45 -04:00
Code Issues Projects Releases Packages Wiki Activity

fs/dcache.c: Save one 32-bit multiply in dcache lookup

Browse source 
Noe that we're mixing in the parent pointer earlier, we
don't need to use hash_32() to mix its bits.  Instead, we can
just take the msbits of the hash value directly.

For those applications which use the partial_name_hash(),
move the multiply to end_name_hash.

Signed-off-by: George Spelvin <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
George Spelvin 2016-06-10 00:22:12 -04:00 • committed by Linus Torvalds
commit 703b5faf22
2 changed files with 5 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

2
fs/dcache.c
View file

@ -106,7 +106,7 @@ static struct hlist_bl_head *dentry_hashtable __read_mostly;
static inline struct hlist_bl_head *d_hash(unsigned int hash)
{
return dentry_hashtable + hash_32(hash, d_hash_shift);
return dentry_hashtable + (hash >> (32 - d_hash_shift));
}
#define IN_LOOKUP_SHIFT 10