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authorMartin Kletzander <mkletzan@redhat.com>2015-11-06 16:30:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 17:50:42 -0800
commit5e4ee7b13b522d07196e737f399843c58569604d (patch)
tree7f5b7b73d3b5548ef681f35b29363fdf4fc93205 /lib
parent3e406b1d7c1e5c14c84a71eb4bee5f46ba690401 (diff)
downloadleg-kernel-5e4ee7b13b522d07196e737f399843c58569604d.tar.gz
printk: synchronize %p formatting documentation
Move all pointer-formatting documentation to one place in the code and one place in the documentation instead of keeping it in three places with different level of completeness. Documentation/printk-formats.txt has detailed information about each modifier, docstring above pointer() has short descriptions of them (as that is the function dealing with %p) and docstring above vsprintf() is removed as redundant. Both docstrings in the code that were modified are updated with a reminder of updating the documentation upon any further change. [akpm@linux-foundation.org: fix comment] Signed-off-by: Martin Kletzander <mkletzan@redhat.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/vsprintf.c40
1 files changed, 8 insertions, 32 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 95cd63b43b99..e966a45e2f00 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1448,6 +1448,9 @@ int kptr_restrict __read_mostly;
* - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
* (legacy clock framework) of the clock
* - 'Cr' For a clock, it prints the current rate of the clock
+ * - 'n' For ignored argument
+ *
+ * ** Please update also Documentation/printk-formats.txt when making changes **
*
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
* function pointers are really function descriptors, which contain a
@@ -1812,40 +1815,13 @@ qualifier:
* @args: Arguments for the format string
*
* This function follows C99 vsnprintf, but has some extensions:
- * %pS output the name of a text symbol with offset
- * %ps output the name of a text symbol without offset
- * %pF output the name of a function pointer with its offset
- * %pf output the name of a function pointer without its offset
- * %pB output the name of a backtrace symbol with its offset
- * %pR output the address range in a struct resource with decoded flags
- * %pr output the address range in a struct resource with raw flags
- * %pb output the bitmap with field width as the number of bits
- * %pbl output the bitmap as range list with field width as the number of bits
- * %pM output a 6-byte MAC address with colons
- * %pMR output a 6-byte MAC address with colons in reversed order
- * %pMF output a 6-byte MAC address with dashes
- * %pm output a 6-byte MAC address without colons
- * %pmR output a 6-byte MAC address without colons in reversed order
- * %pI4 print an IPv4 address without leading zeros
- * %pi4 print an IPv4 address with leading zeros
- * %pI6 print an IPv6 address with colons
- * %pi6 print an IPv6 address without colons
- * %pI6c print an IPv6 address as specified by RFC 5952
- * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
- * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
- * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
- * case.
- * %*pE[achnops] print an escaped buffer
- * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
- * bytes of the input)
- * %pC output the name (Common Clock Framework) or address (legacy clock
- * framework) of a clock
- * %pCn output the name (Common Clock Framework) or address (legacy clock
- * framework) of a clock
- * %pCr output the current rate of a clock
* %n is ignored
+ * %p* is handled by pointer()
+ *
+ * See pointer() or Documentation/printk-formats.txt for more
+ * extensive description.
*
- * ** Please update Documentation/printk-formats.txt when making changes **
+ * ** Please update the documentation in both places when making changes **
*
* The return value is the number of characters which would
* be generated for the given input, excluding the trailing