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authorSteven Rostedt <srostedt@redhat.com>2009-09-17 04:03:06 +0400
committerSteven Rostedt <rostedt@goodmis.org>2009-09-17 23:53:14 +0400
commit91adcd2c4b104a8ce2973e6e84b01fd48735ffc6 (patch)
tree18a97957e7881ef3e4405be940c0ebfc61873b41 /lib
parent45bd00d31de886f8425b4dd33204b911b0a466a9 (diff)
downloadlinux-91adcd2c4b104a8ce2973e6e84b01fd48735ffc6.tar.xz
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/vsprintf.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index cb8a112030bb..c8f3ed62cee1 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