Constify two static structs which are never modified to allow the compiler to put them in read-only memory.
The only usage of norm_params is only read from it in usbtv_configure_for_norm(). Making it const shrinks the resulting ko-file with 300 bytes (tested with gcc 10). The only usage of usbtv_ioctl_ops is to put its address to the ioctl_ops field in the video_device struct. Making it const moves ~1kb to read-only memory. Signed-off-by: Rikard Falkeborn <[email protected]> --- drivers/media/usb/usbtv/usbtv-video.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/media/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbtv/usbtv-video.c index 3b4a2e769230..a714ad77ca8e 100644 --- a/drivers/media/usb/usbtv/usbtv-video.c +++ b/drivers/media/usb/usbtv/usbtv-video.c @@ -47,7 +47,7 @@ #include "usbtv.h" -static struct usbtv_norm_params norm_params[] = { +static const struct usbtv_norm_params norm_params[] = { { .norm = V4L2_STD_525_60, .cap_width = 720, @@ -63,7 +63,7 @@ static struct usbtv_norm_params norm_params[] = { static int usbtv_configure_for_norm(struct usbtv *usbtv, v4l2_std_id norm) { int i, ret = 0; - struct usbtv_norm_params *params = NULL; + const struct usbtv_norm_params *params = NULL; for (i = 0; i < ARRAY_SIZE(norm_params); i++) { if (norm_params[i].norm & norm) { @@ -685,7 +685,7 @@ static int usbtv_s_input(struct file *file, void *priv, unsigned int i) return usbtv_select_input(usbtv, i); } -static struct v4l2_ioctl_ops usbtv_ioctl_ops = { +static const struct v4l2_ioctl_ops usbtv_ioctl_ops = { .vidioc_querycap = usbtv_querycap, .vidioc_enum_input = usbtv_enum_input, .vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap, -- 2.30.0
