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s390/maccess: remove dead DAT-off code 

As the kernel is executed in DAT-on mode only, remove
unnecessary DAT bit check together with the dead code.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2022-12-02 19:23:11 +01:00 committed by Heiko Carstens
parent bb1520d581
commit 12cf6473d2
1 changed files with 5 additions and 9 deletions
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14
arch/s390/mm/maccess.c
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@ -68,15 +68,11 @@ notrace void *s390_kernel_write(void *dst, const void *src, size_t size)
long copied;
spin_lock_irqsave(&s390_kernel_write_lock, flags);
if (!(flags & PSW_MASK_DAT)) {
memcpy(dst, src, size);
} else {
while (size) {
copied = s390_kernel_write_odd(tmp, src, size);
tmp += copied;
src += copied;
size -= copied;
}
while (size) {
copied = s390_kernel_write_odd(tmp, src, size);
tmp += copied;
src += copied;
size -= copied;
}
spin_unlock_irqrestore(&s390_kernel_write_lock, flags);