Drivers: hv: ring_buffer: use wrap around mappings in hv_copy{from, to}_ringbuffer()
With wrap around mappings for ring buffers we can always use a single memcpy() to do the job. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Tested-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -172,18 +172,7 @@ static u32 hv_copyfrom_ringbuffer(
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void *ring_buffer = hv_get_ring_buffer(ring_info);
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u32 ring_buffer_size = hv_get_ring_buffersize(ring_info);
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u32 frag_len;
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/* wrap-around detected at the src */
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if (destlen > ring_buffer_size - start_read_offset) {
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frag_len = ring_buffer_size - start_read_offset;
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memcpy(dest, ring_buffer + start_read_offset, frag_len);
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memcpy(dest + frag_len, ring_buffer, destlen - frag_len);
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} else
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memcpy(dest, ring_buffer + start_read_offset, destlen);
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memcpy(dest, ring_buffer + start_read_offset, destlen);
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start_read_offset += destlen;
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start_read_offset %= ring_buffer_size;
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@ -204,15 +193,8 @@ static u32 hv_copyto_ringbuffer(
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{
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void *ring_buffer = hv_get_ring_buffer(ring_info);
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u32 ring_buffer_size = hv_get_ring_buffersize(ring_info);
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u32 frag_len;
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/* wrap-around detected! */
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if (srclen > ring_buffer_size - start_write_offset) {
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frag_len = ring_buffer_size - start_write_offset;
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memcpy(ring_buffer + start_write_offset, src, frag_len);
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memcpy(ring_buffer, src + frag_len, srclen - frag_len);
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} else
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memcpy(ring_buffer + start_write_offset, src, srclen);
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memcpy(ring_buffer + start_write_offset, src, srclen);
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start_write_offset += srclen;
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start_write_offset %= ring_buffer_size;
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