lib/vsprintf: document %p parameters passed by reference

This patch series improves the documentation for printk() formats, and
adds support for printing clocks.  The latter has always been a hassle if
you wanted to support both the common and legacy clock frameworks.

  - '%pC' and '%pCn' print the name (Common Clock Framework) or address
    (legacy clock framework) of a clock,
  - '%pCr' prints the current clock rate.

This patch (of 3):

Make sure all %p extensions that take parameters by references are
documented to do so.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 5a615c14f75d..71438f3eb0c0 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -54,6 +54,7 @@ Struct Resources:
 
         For printing struct resources. The 'R' and 'r' specifiers result in a
         printed resource with ('R') or without ('r') a decoded flags member.
+        Passed by reference.
 
 Physical addresses types phys_addr_t:
 
@@ -132,6 +133,8 @@ MAC/FDDI addresses:
         specifier to use reversed byte order suitable for visual interpretation
         of Bluetooth addresses which are in the little endian order.
 
+        Passed by reference.
+
 IPv4 addresses:
 
         %pI4    1.2.3.4
@@ -146,6 +149,8 @@ IPv4 addresses:
         host, network, big or little endian order addresses respectively. Where
         no specifier is provided the default network/big endian order is used.
 
+        Passed by reference.
+
 IPv6 addresses:
 
         %pI6    0001:0002:0003:0004:0005:0006:0007:0008
@@ -160,6 +165,8 @@ IPv6 addresses:
         print a compressed IPv6 address as described by
         http://tools.ietf.org/html/rfc5952
 
+        Passed by reference.
+
 IPv4/IPv6 addresses (generic, with port, flowinfo, scope):
 
         %pIS    1.2.3.4         or 0001:0002:0003:0004:0005:0006:0007:0008
@@ -186,6 +193,8 @@ IPv4/IPv6 addresses (generic, with port, flowinfo, scope):
         specifiers can be used as well and are ignored in case of an IPv6
         address.
 
+        Passed by reference.
+
         Further examples:
 
         %pISfc          1.2.3.4         or [1:2:3:4:5:6:7:8]/123456789
@@ -207,6 +216,8 @@ UUID/GUID addresses:
         Where no additional specifiers are used the default little endian
         order with lower case hex characters will be printed.
 
+        Passed by reference.
+
 dentry names:
         %pd{,2,3,4}
         %pD{,2,3,4}
@@ -216,6 +227,8 @@ dentry names:
         equivalent of %s dentry->d_name.name we used to use, %pd<n> prints
         n last components.  %pD does the same thing for struct file.
 
+        Passed by reference.
+
 struct va_format:
 
         %pV
@@ -231,6 +244,8 @@ struct va_format:
         Do not use this feature without some mechanism to verify the
         correctness of the format string and va_list arguments.
 
+        Passed by reference.
+
 u64 SHOULD be printed with %llu/%llx:
 
         printk("%llu", u64_var);