Re: [PATCH v3 1/7] Documentation: dynamic-debug: Add description of level bitmask

Matthew Wilcox
2020-06-09T11:09:13Z

On Tue, Jun 09, 2020 at 01:45:58PM +0300, Stanimir Varbanov wrote:
> +level
> + The given level will be a bitmask ANDed with the level of the each ``pr_debug()``
> + callsite. This will allow to group debug messages and show only those of the
> + same level. The -p flag takes precedence over the given level. Note that we can
> + have up to five groups of debug messages.

That doesn't sound like a "level". printk has levels. If you ask for
"level 3" messages, you get messages from levels 0, 1, 2, and 3. These
seem like "types" or "groups" or something.

> + // enable all messages in file with 0x01 level bitmask
> + nullarbor:~ # echo -n 'file foo.c level 0x01 +p' >
> + <debugfs>/dynamic_debug/control