Revision 88b67edd7247466bc47f01e1dc539b0d0d4b931e authored by Jan Kara on 21 September 2020, 09:33:23 UTC, committed by Dan Williams on 21 September 2020, 13:53:09 UTC
dax_supported() is defined whenever CONFIG_DAX is enabled. So dummy implementation should be defined only in !CONFIG_DAX case, not in !CONFIG_FS_DAX case. Fixes: e2ec51282545 ("dm: Call proper helper to determine dax support") Cc: <stable@vger.kernel.org> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
1 parent ba4f184
hash_func01.h
/* SPDX-License-Identifier: LGPL-2.1
*
* Based on Paul Hsieh's (LGPG 2.1) hash function
* From: http://www.azillionmonkeys.com/qed/hash.html
*/
#define get16bits(d) (*((const __u16 *) (d)))
static __always_inline
__u32 SuperFastHash (const char *data, int len, __u32 initval) {
__u32 hash = initval;
__u32 tmp;
int rem;
if (len <= 0 || data == NULL) return 0;
rem = len & 3;
len >>= 2;
/* Main loop */
#pragma clang loop unroll(full)
for (;len > 0; len--) {
hash += get16bits (data);
tmp = (get16bits (data+2) << 11) ^ hash;
hash = (hash << 16) ^ tmp;
data += 2*sizeof (__u16);
hash += hash >> 11;
}
/* Handle end cases */
switch (rem) {
case 3: hash += get16bits (data);
hash ^= hash << 16;
hash ^= ((signed char)data[sizeof (__u16)]) << 18;
hash += hash >> 11;
break;
case 2: hash += get16bits (data);
hash ^= hash << 11;
hash += hash >> 17;
break;
case 1: hash += (signed char)*data;
hash ^= hash << 10;
hash += hash >> 1;
}
/* Force "avalanching" of final 127 bits */
hash ^= hash << 3;
hash += hash >> 5;
hash ^= hash << 4;
hash += hash >> 17;
hash ^= hash << 25;
hash += hash >> 6;
return hash;
}
![swh spinner](/static/img/swh-spinner.gif)
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