Printing bitfields in the kernel (Re: [PATCH] drm: Parse Colorimetry data block from EDID)
Joe Perches
joe at perches.com
Fri Aug 28 00:58:22 EDT 2020
On Thu, 2020-08-27 at 10:34 +0300, Pekka Paalanen wrote:
> On Wed, 26 Aug 2020 22:23:28 +0800
> Algea Cao <algea.cao at rock-chips.com> wrote:
>
> > CEA 861.3 spec adds colorimetry data block for HDMI.
> > Parsing the block to get the colorimetry data from
> > panel.
If flags are int, I could imagine another %p<foo> extension
where %*p<foo> is used like:
printk("flags: %*p<foo>n", flags, bitstrings)
where flags is:
BIT(0)
BIT(1)
...
BIT(last)
and
char *bitstrings[] = {
"bit 0 description",
"bit 1 description",
...
"last bit description"
};
Or define YA struct with 2 entries as the struct members
and use that.
struct foo {
unsigned long flags,
char ** descriptions,
};
struct foo bar = {.flags = <flags> .descriptions = bitstrings};
printk("flags: %p<foo>\n, &bar);
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