linux-kernel - [PATCH] Documentation: add print bitmap description

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Message-ID: <1424921305-93124-1-git-send-email-long.wanglong@huawei.com>
Date:	Thu, 26 Feb 2015 03:28:25 +0000
From:	Wang Long <long.wanglong@...wei.com>
To:	<tj@...nel.org>, <corbet@....net>
CC:	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<long.wanglong@...wei.com>, <peifeiyue@...wei.com>
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 <long.wanglong@...wei.com>
---
 Documentation/printk-formats.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 5a615c1..255a061 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.
-- 
1.8.3.4

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