s390/maccess: add no DAT mode to kernel_write
[ Upstream commit d6df52e999
]
To be able to patch kernel code before paging is initialized do plain
memcpy if DAT is off. This is required to enable early jump label
initialization.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
parent
627d15eecb
commit
1a70857590
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@ -62,11 +62,15 @@ notrace void *s390_kernel_write(void *dst, const void *src, size_t size)
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long copied;
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spin_lock_irqsave(&s390_kernel_write_lock, flags);
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while (size) {
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copied = s390_kernel_write_odd(tmp, src, size);
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tmp += copied;
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src += copied;
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size -= copied;
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if (!(flags & PSW_MASK_DAT)) {
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memcpy(dst, src, size);
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} else {
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while (size) {
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copied = s390_kernel_write_odd(tmp, src, size);
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tmp += copied;
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src += copied;
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size -= copied;
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}
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}
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spin_unlock_irqrestore(&s390_kernel_write_lock, flags);
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