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authorSteven Rostedt <srostedt@redhat.com>2011-04-12 18:53:25 -0400
committerSteven Rostedt <rostedt@goodmis.org>2011-05-16 14:44:20 -0400
commitdfad3d598c4bbbaf137588e22bac1ce624529f7e (patch)
tree7df293e467f93913d1979a0e7131bb6e1977acd7 /scripts/recordmcount.c
parentffd618fa39284f8cc343894b566dd42ec6e74e77 (diff)
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ftrace/recordmcount: Add warning logic to warn on mcount not recorded
There's some sections that should not have mcount recorded and should not have modifications to the that code. But currently they waste some time by calling mcount anyway (which simply returns). As the real answer should be to either whitelist the section or have gcc ignore it fully. This change adds a option to recordmcount to warn when it finds a section that is ignored by ftrace but still contains mcount callers. This is not on by default as developers may not know if the section should be completely ignored or added to the whitelist. Cc: John Reiser <jreiser@bitwagon.com> Link: http://lkml.kernel.org/r/20110421023738.476989377@goodmis.org Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'scripts/recordmcount.c')
-rw-r--r--scripts/recordmcount.c32
1 files changed, 24 insertions, 8 deletions
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index 78054a4..0e18975 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -24,6 +24,7 @@
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
+#include <getopt.h>
#include <elf.h>
#include <fcntl.h>
#include <setjmp.h>
@@ -39,6 +40,7 @@ static char gpfx; /* prefix for global symbol name (sometimes '_') */
static struct stat sb; /* Remember .st_size, etc. */
static jmp_buf jmpenv; /* setjmp/longjmp per-file error escape */
static const char *altmcount; /* alternate mcount symbol name */
+static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */
/* setjmp() return values */
enum {
@@ -397,19 +399,33 @@ do_file(char const *const fname)
}
int
-main(int argc, char const *argv[])
+main(int argc, char *argv[])
{
const char ftrace[] = "/ftrace.o";
int ftrace_size = sizeof(ftrace) - 1;
int n_error = 0; /* gcc-4.3.0 false positive complaint */
+ int c;
+ int i;
- if (argc <= 1) {
- fprintf(stderr, "usage: recordmcount file.o...\n");
+ while ((c = getopt(argc, argv, "w")) >= 0) {
+ switch (c) {
+ case 'w':
+ warn_on_notrace_sect = 1;
+ break;
+ default:
+ fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
+ return 0;
+ }
+ }
+
+ if ((argc - optind) < 1) {
+ fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
return 0;
}
/* Process each file in turn, allowing deep failure. */
- for (--argc, ++argv; argc > 0; --argc, ++argv) {
+ for (i = optind; i < argc; i++) {
+ char *file = argv[i];
int const sjval = setjmp(jmpenv);
int len;
@@ -418,14 +434,14 @@ main(int argc, char const *argv[])
* function but does not call it. Since ftrace.o should
* not be traced anyway, we just skip it.
*/
- len = strlen(argv[0]);
+ len = strlen(file);
if (len >= ftrace_size &&
- strcmp(argv[0] + (len - ftrace_size), ftrace) == 0)
+ strcmp(file + (len - ftrace_size), ftrace) == 0)
continue;
switch (sjval) {
default:
- fprintf(stderr, "internal error: %s\n", argv[0]);
+ fprintf(stderr, "internal error: %s\n", file);
exit(1);
break;
case SJ_SETJMP: /* normal sequence */
@@ -433,7 +449,7 @@ main(int argc, char const *argv[])
fd_map = -1;
ehdr_curr = NULL;
mmap_failed = 1;
- do_file(argv[0]);
+ do_file(file);
break;
case SJ_FAIL: /* error in do_file or below */
++n_error;