Merge tag 'xfs-for-linus-4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...

[sfrench/cifs-2.6.git] / Documentation / printk-formats.txt

diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 5d1128bf02824aaf2e16ef332e7cef014cccf7b6..5962949944fd7307530f26c54c65d783745a8a27 100644 (file)
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -298,6 +298,24 @@ bitmap and its derivatives such as cpumask and nodemask:
 
        Passed by reference.
 
+Flags bitfields such as page flags, gfp_flags:
+
+       %pGp    referenced|uptodate|lru|active|private
+       %pGg    GFP_USER|GFP_DMA32|GFP_NOWARN
+       %pGv    read|exec|mayread|maywrite|mayexec|denywrite
+
+       For printing flags bitfields as a collection of symbolic constants that
+       would construct the value. The type of flags is given by the third
+       character. Currently supported are [p]age flags, [v]ma_flags (both
+       expect unsigned long *) and [g]fp_flags (expects gfp_t *). The flag
+       names and print order depends on the particular type.
+
+       Note that this format should not be used directly in TP_printk() part
+       of a tracepoint. Instead, use the show_*_flags() functions from
+       <trace/events/mmflags.h>.
+
+       Passed by reference.
+
 Network device features:
 
        %pNF    0x000000000000c000