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Add functions and macros as used upstream.

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Added highbit64() and howmany() which are used in recent upstream
code.  Both highbit() and highbit64() should at some point be
re-factored to use the optimized fls() and fls64() functions.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #363
This commit is contained in:
Tim Chase
2014-04-26 20:56:03 -05:00
committed by Brian Behlendorf
parent 377e12f14a
commit 7f23e00109
2 changed files with 34 additions and 0 deletions
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module/spl/spl-generic.c
+30
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@@ -97,6 +97,36 @@ highbit(unsigned long i)
}
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