vsprintf: add %ps that is the same as %pS but is like %pf

On PowerPC64 function pointers do not point directly at the functions,
but instead point to pointers to the functions. The output of %pF expects
to point to a pointer to the function, whereas %pS will show the function
itself.

mcount returns the direct pointer to the function and not the pointer to
the pointer. Thus %pS must be used to show this. The function tracer
requires printing of the functions without offsets and uses the %pf
instead.

 %pF produces run_local_timers+0x4/0x1f
 %pf produces just run_local_timers

For PowerPC64, we need to use the direct pointer, and we only have
%pS which will produce .run_local_timers+0x4/0x1f

This patch creates a %ps that matches the %pf as %pS matches %pF.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Zhao Lei <zhaolei@cn.fujitsu.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index cb8a112030b..c8f3ed62cee 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -581,7 +581,7 @@ static char *symbol_string(char *buf, char *end, void *ptr,
         unsigned long value = (unsigned long) ptr;
 #ifdef CONFIG_KALLSYMS
         char sym[KSYM_SYMBOL_LEN];
-        if (ext != 'f')
+        if (ext != 'f' && ext != 's')
                 sprint_symbol(sym, value);
         else
                 kallsyms_lookup(value, NULL, NULL, NULL, sym);
@@ -822,6 +822,7 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
         case 'F':
         case 'f':
                 ptr = dereference_function_descriptor(ptr);
+        case 's':
                 /* Fallthrough */
         case 'S':
                 return symbol_string(buf, end, ptr, spec, *fmt);
@@ -1063,7 +1064,8 @@ qualifier:
  * @args: Arguments for the format string
  *
  * This function follows C99 vsnprintf, but has some extensions:
- * %pS output the name of a text symbol
+ * %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
  * %pR output the address range in a struct resource