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>
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 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 @@
}
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 @@
* 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 @@
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;
diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
index 657dbed..22033d5 100644
--- a/scripts/recordmcount.h
+++ b/scripts/recordmcount.h
@@ -313,7 +313,8 @@
* into nops.
*/
static void nop_mcount(Elf_Shdr const *const relhdr,
- Elf_Ehdr const *const ehdr)
+ Elf_Ehdr const *const ehdr,
+ const char *const txtname)
{
Elf_Shdr *const shdr0 = (Elf_Shdr *)(_w(ehdr->e_shoff)
+ (void *)ehdr);
@@ -336,6 +337,7 @@
unsigned mcountsym = 0;
unsigned t;
+ int once = 0;
for (t = nrel; t; --t) {
int ret = -1;
@@ -353,8 +355,18 @@
mcountsym = Elf_r_sym(relp);
}
- if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp))
- ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset);
+ if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) {
+ if (make_nop)
+ ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset);
+ if (warn_on_notrace_sect && !once) {
+ printf("Section %s has mcount callers being ignored\n",
+ txtname);
+ once = 1;
+ /* just warn? */
+ if (!make_nop)
+ return;
+ }
+ }
/*
* If we successfully removed the mcount, mark the relocation
@@ -501,12 +513,12 @@
mlocp = sift_rel_mcount(mlocp,
(void *)mlocp - (void *)mloc0, &mrelp,
relhdr, ehdr, recsym, recval, reltype);
- } else if (make_nop && txtname) {
+ } else if (txtname && (warn_on_notrace_sect || make_nop)) {
/*
* This section is ignored by ftrace, but still
* has mcount calls. Convert them to nops now.
*/
- nop_mcount(relhdr, ehdr);
+ nop_mcount(relhdr, ehdr, txtname);
}
}
if (mloc0 != mlocp) {