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Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull objtool fix from Thomas Gleixner:
 "A single fix for objtool to address a bug in handling the cold
  subfunction detection for aliased functions which was added recently.
  The bug causes objtool to enter an infinite loop"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool: Support GCC 8 '-fnoreorder-functions'
This commit is contained in:
Linus Torvalds 2018-07-08 11:57:40 -07:00
commit f5c926b99e
1 changed files with 26 additions and 11 deletions
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37
tools/objtool/elf.c
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@ -302,19 +302,34 @@ static int read_symbols(struct elf *elf)
continue;
sym->pfunc = sym->cfunc = sym;
coldstr = strstr(sym->name, ".cold.");
if (coldstr) {
coldstr[0] = '\0';
pfunc = find_symbol_by_name(elf, sym->name);
coldstr[0] = '.';
if (!coldstr)
continue;
if (!pfunc) {
WARN("%s(): can't find parent function",
sym->name);
goto err;
}
coldstr[0] = '\0';
pfunc = find_symbol_by_name(elf, sym->name);
coldstr[0] = '.';
sym->pfunc = pfunc;
pfunc->cfunc = sym;
if (!pfunc) {
WARN("%s(): can't find parent function",
sym->name);
goto err;
}
sym->pfunc = pfunc;
pfunc->cfunc = sym;
/*
* Unfortunately, -fnoreorder-functions puts the child
* inside the parent. Remove the overlap so we can
* have sane assumptions.
*
* Note that pfunc->len now no longer matches
* pfunc->sym.st_size.
*/
if (sym->sec == pfunc->sec &&
sym->offset >= pfunc->offset &&
sym->offset + sym->len == pfunc->offset + pfunc->len) {
pfunc->len -= sym->len;
}
}
}