path: root/lib
diff options
authorJoe Perches <joe@perches.com>2012-12-12 10:18:50 -0800
committerJiri Kosina <jkosina@suse.cz>2013-04-30 22:31:16 +0200
commitb0d33c2bd77bcf2d7c9427d2361ac57fe5b33aa1 (patch)
tree2acb72d0e39aee019cf8aecc917685b120e506a3 /lib
parent071361d3473ebb8142907470ff12d59c59f6be72 (diff)
vsprintf: Add extension %pSR - print_symbol replacement
print_symbol takes a long and converts it to a function name and offset. %pS does something similar, but doesn't translate the address via __builtin_extract_return_addr. %pSR does the translation. This will enable replacing multiple calls like printk(...); printk_symbol(addr); printk("\n"); with a single non-interleavable in dmesg printk("... %pSR\n", (void *)addr); Update documentation too. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'lib')
1 files changed, 13 insertions, 5 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 0d62fd700f68..e149c6416384 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -534,14 +534,21 @@ char *string(char *buf, char *end, const char *s, struct printf_spec spec)
static noinline_for_stack
char *symbol_string(char *buf, char *end, void *ptr,
- struct printf_spec spec, char ext)
+ struct printf_spec spec, const char *fmt)
- unsigned long value = (unsigned long) ptr;
+ unsigned long value;
char sym[KSYM_SYMBOL_LEN];
- if (ext == 'B')
+ if (fmt[1] == 'R')
+ ptr = __builtin_extract_return_addr(ptr);
+ value = (unsigned long)ptr;
+ if (*fmt == 'B')
sprint_backtrace(sym, value);
- else if (ext != 'f' && ext != 's')
+ else if (*fmt != 'f' && *fmt != 's')
sprint_symbol(sym, value);
sprint_symbol_no_offset(sym, value);
@@ -987,6 +994,7 @@ int kptr_restrict __read_mostly;
* - 'f' For simple symbolic function names without offset
* - 'S' For symbolic direct pointers with offset
* - 's' For symbolic direct pointers without offset
+ * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
* - 'B' For backtraced symbolic direct pointers with offset
* - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
* - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
@@ -1060,7 +1068,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
case 'S':
case 's':
case 'B':
- return symbol_string(buf, end, ptr, spec, *fmt);
+ return symbol_string(buf, end, ptr, spec, fmt);
case 'R':
case 'r':
return resource_string(buf, end, ptr, spec, fmt);

Privacy Policy