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s390/checksum: use register pair instead of register asm

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Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-06-09 22:59:13 +02:00 committed by Vasily Gorbik
parent 3c45a07bee
commit a29a6b5a92
1 changed files with 6 additions and 4 deletions
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10
arch/s390/include/asm/checksum.h
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@ -29,13 +29,15 @@
*/
static inline __wsum csum_partial(const void *buff, int len, __wsum sum)
{
register unsigned long reg2 asm("2") = (unsigned long) buff;
register unsigned long reg3 asm("3") = (unsigned long) len;
union register_pair rp = {
.even = (unsigned long) buff,
.odd = (unsigned long) len,
};
asm volatile(
"0: cksm %0,%1\n" /* do checksum on longs */
"0: cksm %[sum],%[rp]\n"
" jo 0b\n"
: "+d" (sum), "+d" (reg2), "+d" (reg3) : : "cc", "memory");
: [sum] "+&d" (sum), [rp] "+&d" (rp.pair) : : "cc", "memory");
return sum;
}