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author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-30 13:47:37 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-30 13:47:37 -0700 |
commit | 30945669593df14692e933c557d00c4bb2727857 (patch) | |
tree | 69dee0556b482898ae95f1bdfa25c63f4ce16f57 /lib | |
parent | 5aa1c98862d3f365d9cf6d0833d5dc127d2a76e7 (diff) | |
parent | b0d33c2bd77bcf2d7c9427d2361ac57fe5b33aa1 (diff) | |
download | lwn-30945669593df14692e933c557d00c4bb2727857.tar.gz lwn-30945669593df14692e933c557d00c4bb2727857.zip |
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
Diffstat (limited to 'lib')
-rw-r--r-- | lib/vsprintf.c | 18 |
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; #ifdef CONFIG_KALLSYMS char sym[KSYM_SYMBOL_LEN]; - if (ext == 'B') +#endif + + if (fmt[1] == 'R') + ptr = __builtin_extract_return_addr(ptr); + value = (unsigned long)ptr; + +#ifdef CONFIG_KALLSYMS + if (*fmt == 'B') sprint_backtrace(sym, value); - else if (ext != 'f' && ext != 's') + else if (*fmt != 'f' && *fmt != 's') sprint_symbol(sym, value); else 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); |