[PATCH] vsprintf: introduce %pf

Frederic Weisbecker
2009-04-15T00:01:20Z

If I remember well, a format which could let us to print a pure
function name has been suggested by Andrew Morton some monthes ago.

The current %pF is very convenient to print a function symbol, but
often we only want to print the name of the function, without
its asm offset.

That's what does %pf in this patch.
The lowecase f has been chosen for its intuitive sense of a weak kind
of %pF

The support for this new format would be welcome for the tracing tree
where the need to print pure function names is often needed and also
on other parts:

$ git-grep -E "kallsyms_lookup\(.+?\)"
arch/blackfin/kernel/traps.c: symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
arch/powerpc/xmon/xmon.c: name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr);
arch/sh/kernel/cpu/sh5/unwind.c: sym = kallsyms_lookup(pc, NULL, &offset, NULL, namebuf);
arch/x86/kernel/ftrace.c: kallsyms_lookup((unsigned long) syscall, NULL, NULL, NULL, str);
kernel/kprobes.c: sym = kallsyms_lookup((unsigned long)p->addr, NULL,
kernel/lockdep.c: return kallsyms_lookup((unsigned long)key, NULL, NULL, NULL, str);
kernel/trace/ftrace.c: kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
kernel/trace/ftrace.c: kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
kernel/trace/ftrace.c: kallsyms_lookup((unsigned long)rec->ops->func, NULL, NULL, NULL, str);
kernel/trace/ftrace.c: kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
kernel/trace/ftrace.c: kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
kernel/trace/ftrace.c: kallsyms_lookup(rec->ip, NULL, NULL, &modname, str);
kernel/trace/ftrace.c: kallsyms_lookup(*ptr, NULL, NULL, NULL, str);
kernel/trace/trace_functions.c: kallsyms_lookup(ip, NULL, NULL, NULL, str);
kernel/trace/trace_output.c: kallsyms_lookup(address, NULL, NULL, NULL, str);

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
lib/vsprintf.c | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index b56f6d0..15c9094 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -575,12 +575,15 @@ static char *string(char *buf, char *end, char *s, struct printf_spec spec)
}

static char *symbol_string(char *buf, char *end, void *ptr,
- struct printf_spec spec)
+ struct printf_spec spec, char ext)
{
unsigned long value = (unsigned long) ptr;
#ifdef CONFIG_KALLSYMS
char sym[KSYM_SYMBOL_LEN];
- sprint_symbol(sym, value);
+ if (ext != 'f')
+ sprint_symbol(sym, value);
+ else
+ kallsyms_lookup(value, NULL, NULL, NULL, sym);
return string(buf, end, sym, spec);
#else
spec.field_width = 2*sizeof(void *);
@@ -692,7 +695,8 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr,
*
* Right now we handle:
*
- * - 'F' For symbolic function descriptor pointers
+ * - 'F' For symbolic function descriptor pointers with asm offset
+ * - 'f' For simple function symbol
* - 'S' For symbolic direct pointers
* - 'R' For a struct resource pointer, it prints the range of
* addresses (not the name nor the flags)
@@ -715,10 +719,11 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,

switch (*fmt) {
case 'F':
+ case 'f':
ptr = dereference_function_descriptor(ptr);
/* Fallthrough */
case 'S':
- return symbol_string(buf, end, ptr, spec);
+ return symbol_string(buf, end, ptr, spec, *fmt);
case 'R':
return resource_string(buf, end, ptr, spec);
case 'm':
--
1.6.1