Hmm, interesting. Twice 'sparse' in the same subject line with different
meanings :-)
This is another sparse error I get with drivers/media/v4l2-core/v4l2-ioctl.c:
drivers/media/v4l2-core/v4l2-ioctl.c:424:9: error: cannot size expression
(there are more of those in drivers/media, all with the same cause).
This sparse (the tool) error occurs because of sparse (C language) array
initialization
in combination with ARRAY_SIZE:
static const char *v4l2_memory_names[] = {
[V4L2_MEMORY_MMAP] = "mmap",
[V4L2_MEMORY_USERPTR] = "userptr",
[V4L2_MEMORY_OVERLAY] = "overlay",
[V4L2_MEMORY_DMABUF] = "dmabuf",
};
#define prt_names(a, arr) (((unsigned)(a)) < ARRAY_SIZE(arr) ? arr[a] :
"unknown")
static void v4l_print_requestbuffers(const void *arg, bool write_only)
{
const struct v4l2_requestbuffers *p = arg;
pr_cont("count=%d, type=%s, memory=%s\n",
p->count,
prt_names(p->type, v4l2_type_names),
prt_names(p->memory, v4l2_memory_names));
}
I could change v4l2_memory_names to:
static const char *v4l2_memory_names[V4L2_MEMORY_DMABUF + 1] = {
and the error goes away.
I'm actually not sure if this is a sparse bug or a feature.
If it is a feature then the error message is definitely wrong, since the size is
perfectly well defined. As an aside: the error message is pretty vague IMHO.
Regards,
Hans
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