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>

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.