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| author | Wang Long <long.wanglong@huawei.com> | 2015-02-26 03:28:25 +0000 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2015-03-20 07:41:55 -0600 |
| commit | d0724961552f2b7da89e4b822b985f3c9fd13b79 (patch) | |
| tree | 0fdcb4567e61e6313109c55e4acce7f43d21342f /Documentation/printk-formats.txt | |
| parent | ad4a6ebeffd2767bdcdec9e1acea7ffc00d5be2d (diff) | |
| download | lwn-d0724961552f2b7da89e4b822b985f3c9fd13b79.tar.gz lwn-d0724961552f2b7da89e4b822b985f3c9fd13b79.zip | |
Documentation: add print bitmap description
as the commit: "lib/vsprintf: implement bitmap printing through
'%*pb[l]'" add an easy way to print bitmaps. so printk-formats.txt
should reflect it.
Signed-off-by: Wang Long <long.wanglong@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/printk-formats.txt')
| -rw-r--r-- | Documentation/printk-formats.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt index 5a615c14f75d..255a061e4309 100644 --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -239,6 +239,15 @@ s64 SHOULD be printed with %lld/%llx: printk("%lld", s64_var); +bitmap and its derivatives such as cpumask and nodemask: + + %*pb 0779 + %*pbl 0,3-6,8-10 + + For printing bitmap and its derivatives such as cpumask and nodemask, + %*pb output the bitmap with field width as the number of bits and %*pbl + output the bitmap as range list with field width as the number of bits. + If <type> is dependent on a config option for its size (e.g., sector_t, blkcnt_t) or is architecture-dependent for its size (e.g., tcflag_t), use a format specifier of its largest possible type and explicitly cast to it. |