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Map highbit64() to fls64()

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The fls64() function has been available since Linux 2.6.16 and
it should be used to implemented highbit64().  This allows us
to provide an optimized implementation and simplify the code.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2014-09-30 18:07:07 -04:00
parent 9c91800d19
commit 87f8055a91
5 changed files with 3 additions and 97 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/spl/spl-generic.c
-62
View File
@@ -64,68 +64,6 @@ DECLARE_WAIT_QUEUE_HEAD(spl_kallsyms_lookup_name_waitq);
kallsyms_lookup_name_t spl_kallsyms_lookup_name_fn = SYMBOL_POISON;
#endif
int
highbit(unsigned long i)
{
register int h = 1;
SENTRY;
if (i == 0)
SRETURN(0);
#if BITS_PER_LONG == 64
if (i & 0xffffffff00000000ul) {
h += 32; i >>= 32;
}
#endif
if (i & 0xffff0000) {
h += 16; i >>= 16;
}
if (i & 0xff00) {
h += 8; i >>= 8;
}
if (i & 0xf0) {
h += 4; i >>= 4;
}
if (i & 0xc) {
h += 2; i >>= 2;
}
if (i & 0x2) {
h += 1;
}
SRETURN(h);
}
EXPORT_SYMBOL(highbit);
int
highbit64(uint64_t i)
{
register int h = 1;
SENTRY;
if (i == 0)
SRETURN(0);
if (i & 0xffffffff00000000ull) {
h += 32; i >>= 32;
}
if (i & 0xffff0000) {
h += 16; i >>= 16;
}
if (i & 0xff00) {
h += 8; i >>= 8;
}
if (i & 0xf0) {
h += 4; i >>= 4;
}
if (i & 0xc) {
h += 2; i >>= 2;
}
if (i & 0x2) {
h += 1;
}
SRETURN(h);
}
EXPORT_SYMBOL(highbit64);
#if BITS_PER_LONG == 32
/*
* Support 64/64 => 64 division on a 32-bit platform. While the kernel
module/spl/spl-kmem.c
+1 -1
View File
@@ -977,7 +977,7 @@ spl_sko_from_obj(spl_kmem_cache_t *skc, void *obj)
static inline uint32_t
spl_offslab_size(spl_kmem_cache_t *skc)
{
return 1UL << (highbit(spl_obj_size(skc)) + 1);
return 1UL << (fls64(spl_obj_size(skc)) + 1);
}
/*