[PATCH] docs: core-api/printk-formats.rst: Clarify formatting {cpu,node}mask

[Geert Uytterhoeven]

Clarify how to pass the field width for bitmaps, and mention the helper
macros that are available to ease printing cpumask and nodemask.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
 Documentation/core-api/printk-formats.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index 6d26c5c6ac485cec..160e710d992f3a36 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -531,7 +531,9 @@ For printing bitmap and its derivatives such as cpumask and nodemask,
 %*pb outputs 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.
 
-Passed by reference.
+The field width is passed by value, the bitmap is passed by reference.
+Helper macros cpumask_pr_args() and nodemask_pr_args() are available to ease
+printing cpumask and nodemask.
 
 Flags bitfields such as page flags, gfp_flags
 ---------------------------------------------
-- 
2.25.1