ftrace/recordmcount: Add warning logic to warn on mcount not recorded

[linux-2.6-microblaze.git] / scripts / recordmcount.h

diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
index 657dbed..22033d5 100644 (file)
--- a/scripts/recordmcount.h
+++ b/scripts/recordmcount.h
@@ -313,7 +313,8 @@ static uint_t *sift_rel_mcount(uint_t *mlocp,
  * 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 @@ static void nop_mcount(Elf_Shdr const *const relhdr,
 
        unsigned mcountsym = 0;
        unsigned t;
+       int once = 0;
 
        for (t = nrel; t; --t) {
                int ret = -1;
@@ -353,8 +355,18 @@ static void nop_mcount(Elf_Shdr const *const relhdr,
                                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 @@ do_func(Elf_Ehdr *const ehdr, char const *const fname, unsigned const reltype)
                        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) {