[PATCH 5/8] docs: add printk lib. extensions

[Randy Dunlap]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

Add documentation in kerneldoc for new printk format extensions

This patch documents the new %pS/%pF options in printk in kernel doc.

Hope I didn't miss any other extension.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>

---
 kernel/printk.c |    2 ++
 lib/vsprintf.c  |   12 ++++++++++++
 2 files changed, 14 insertions(+)

--- linux-2.6.27-rc9-git2.orig/kernel/printk.c
+++ linux-2.6.27-rc9-git2/kernel/printk.c
@@ -593,6 +593,8 @@ static int have_callable_console(void)
  *
  * See also:
  * printf(3)
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
  */
 
 asmlinkage int printk(const char *fmt, ...)
--- linux-2.6.27-rc9-git2.orig/lib/vsprintf.c
+++ linux-2.6.27-rc9-git2/lib/vsprintf.c
@@ -565,6 +565,10 @@ static char *pointer(const char *fmt, ch
  * @fmt: The format string to use
  * @args: Arguments for the format string
  *
+ * This function follows C99 vsnprintf, but has some extensions:
+ * %pS - output the name of a text symbol
+ * %pF - output the name of a function pointer
+ *
  * The return value is the number of characters which would
  * be generated for the given input, excluding the trailing
  * '\0', as per ISO C99. If you want to have the exact
@@ -806,6 +810,8 @@ EXPORT_SYMBOL(vsnprintf);
  *
  * Call this function if you are already dealing with a va_list.
  * You probably want scnprintf() instead.
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
  */
 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 {
@@ -828,6 +834,8 @@ EXPORT_SYMBOL(vscnprintf);
  * generated for the given input, excluding the trailing null,
  * as per ISO C99.  If the return is greater than or equal to
  * @size, the resulting string is truncated.
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
  */
 int snprintf(char * buf, size_t size, const char *fmt, ...)
 {
@@ -877,6 +885,8 @@ EXPORT_SYMBOL(scnprintf);
  *
  * Call this function if you are already dealing with a va_list.
  * You probably want sprintf() instead.
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
  */
 int vsprintf(char *buf, const char *fmt, va_list args)
 {
@@ -894,6 +904,8 @@ EXPORT_SYMBOL(vsprintf);
  * The function returns the number of characters written
  * into @buf. Use snprintf() or scnprintf() in order to avoid
  * buffer overflows.
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
  */
 int sprintf(char * buf, const char *fmt, ...)
 {


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