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vmbus: constify parameters where possible

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Functions that just query state of ring buffer can have parameters
marked const.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger 2017-02-11 23:02:24 -07:00 committed by Greg Kroah-Hartman
parent 6e47dd3e29
commit e4165a0fad
3 changed files with 19 additions and 21 deletions
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6
drivers/hv/hyperv_vmbus.h
View file

@ -283,14 +283,14 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
int hv_ringbuffer_write(struct vmbus_channel *channel,
struct kvec *kv_list, u32 kv_count);
const struct kvec *kv_list, u32 kv_count);
int hv_ringbuffer_read(struct vmbus_channel *channel,
void *buffer, u32 buflen, u32 *buffer_actual_len,
u64 *requestid, bool raw);
void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info);
void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info);
/*
* Maximum channels is determined by the size of the interrupt page

22
drivers/hv/ring_buffer.c
View file

@ -96,11 +96,9 @@ hv_set_next_write_location(struct hv_ring_buffer_info *ring_info,
/* Get the next read location for the specified ring buffer. */
static inline u32
hv_get_next_read_location(struct hv_ring_buffer_info *ring_info)
hv_get_next_read_location(const struct hv_ring_buffer_info *ring_info)
{
u32 next = ring_info->ring_buffer->read_index;
return next;
return ring_info->ring_buffer->read_index;
}
/*
@ -108,8 +106,8 @@ hv_get_next_read_location(struct hv_ring_buffer_info *ring_info)
* This allows the caller to skip.
*/
static inline u32
hv_get_next_readlocation_withoffset(struct hv_ring_buffer_info *ring_info,
u32 offset)
hv_get_next_readlocation_withoffset(const struct hv_ring_buffer_info *ring_info,
u32 offset)
{
u32 next = ring_info->ring_buffer->read_index;
@ -130,7 +128,7 @@ hv_set_next_read_location(struct hv_ring_buffer_info *ring_info,
/* Get the size of the ring buffer. */
static inline u32
hv_get_ring_buffersize(struct hv_ring_buffer_info *ring_info)
hv_get_ring_buffersize(const struct hv_ring_buffer_info *ring_info)
{
return ring_info->ring_datasize;
}
@ -147,7 +145,7 @@ hv_get_ring_bufferindices(struct hv_ring_buffer_info *ring_info)
* Assume there is enough room. Handles wrap-around in src case only!!
*/
static u32 hv_copyfrom_ringbuffer(
struct hv_ring_buffer_info *ring_info,
const struct hv_ring_buffer_info *ring_info,
void *dest,
u32 destlen,
u32 start_read_offset)
@ -171,7 +169,7 @@ static u32 hv_copyfrom_ringbuffer(
static u32 hv_copyto_ringbuffer(
struct hv_ring_buffer_info *ring_info,
u32 start_write_offset,
void *src,
const void *src,
u32 srclen)
{
void *ring_buffer = hv_get_ring_buffer(ring_info);
@ -186,8 +184,8 @@ static u32 hv_copyto_ringbuffer(
}
/* Get various debug metrics for the specified ring buffer. */
void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info)
void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info)
{
u32 bytes_avail_towrite;
u32 bytes_avail_toread;
@ -264,7 +262,7 @@ void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info)
/* Write to the ring buffer. */
int hv_ringbuffer_write(struct vmbus_channel *channel,
struct kvec *kv_list, u32 kv_count)
const struct kvec *kv_list, u32 kv_count)
{
int i = 0;
u32 bytes_avail_towrite;

12
include/linux/hyperv.h
View file

@ -138,8 +138,8 @@ struct hv_ring_buffer_info {
* for the specified ring buffer
*/
static inline void
hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
u32 *read, u32 *write)
hv_get_ringbuffer_availbytes(const struct hv_ring_buffer_info *rbi,
u32 *read, u32 *write)
{
u32 read_loc, write_loc, dsize;
@ -153,7 +153,7 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
*read = dsize - *write;
}
static inline u32 hv_get_bytes_to_read(struct hv_ring_buffer_info *rbi)
static inline u32 hv_get_bytes_to_read(const struct hv_ring_buffer_info *rbi)
{
u32 read_loc, write_loc, dsize, read;
@ -167,7 +167,7 @@ static inline u32 hv_get_bytes_to_read(struct hv_ring_buffer_info *rbi)
return read;
}
static inline u32 hv_get_bytes_to_write(struct hv_ring_buffer_info *rbi)
static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi)
{
u32 read_loc, write_loc, dsize, write;
@ -1448,9 +1448,9 @@ void vmbus_set_event(struct vmbus_channel *channel);
/* Get the start of the ring buffer. */
static inline void *
hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
hv_get_ring_buffer(const struct hv_ring_buffer_info *ring_info)
{
return (void *)ring_info->ring_buffer->buffer;
return ring_info->ring_buffer->buffer;
}
/*