diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 13:47:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 13:47:37 -0700
commit30945669593df14692e933c557d00c4bb2727857 (patch)
parent5aa1c98862d3f365d9cf6d0833d5dc127d2a76e7 (diff)
parentb0d33c2bd77bcf2d7c9427d2361ac57fe5b33aa1 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
Pull fixup for trivial branch from Jiri Kosina: "Unfortunately I made a mistake when merging into for-linus branch, and omitted one pre-requisity patch for a few other patches (which have been Acked by the appropriate maintainers) in the series. Mea culpa maxima, sorry for that." The trivial branch added %pSR usage before actually teaching vsnprintf() about the 'R' part of %pSR. The 'R' causes the symbol translation to do a "__builtin_extract_return_addr()" before symbol lookup. That said, on most architectures __builtin_extract_return_addr() isn't likely to do anything special, so it probably is not normally noticeable. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: vsprintf: Add extension %pSR - print_symbol replacement
2 files changed, 15 insertions, 5 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 6e953564de0..3af5ae6c9c1 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -17,6 +17,8 @@ Symbols/Function Pointers:
%pF versatile_init+0x0/0x110
%pf versatile_init
%pS versatile_init+0x0/0x110
+ %pSR versatile_init+0x9/0x110
+ (with __builtin_extract_return_addr() translation)
%ps versatile_init
%pB prev_fn_of_versatile_init+0x88/0x88
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 0d62fd700f6..e149c641638 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);