From d0724961552f2b7da89e4b822b985f3c9fd13b79 Mon Sep 17 00:00:00 2001 From: Wang Long Date: Thu, 26 Feb 2015 03:28:25 +0000 Subject: [PATCH] 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 Acked-by: Tejun Heo Signed-off-by: Jonathan Corbet --- Documentation/printk-formats.txt | 9 +++++++++ 1 file changed, 9 insertions(+) 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 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. -- 2.20.1