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s390/crash: make copy_oldmem_page() return number of bytes copied
Callback copy_oldmem_page() returns either error code or zero. Instead, it should return the error code or number of bytes copied. Fixes: df9694c7975f ("s390/dump: streamline oldmem copy functions") Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
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@ -233,9 +233,10 @@ ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize,
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rc = copy_oldmem_user(iter->iov->iov_base, src, csize);
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else
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rc = copy_oldmem_kernel(iter->kvec->iov_base, src, csize);
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if (!rc)
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iov_iter_advance(iter, csize);
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return rc;
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if (rc < 0)
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return rc;
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iov_iter_advance(iter, csize);
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return csize;
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}
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/*
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