[PATCH v2] objtool: Move objtool_file struct off the stack

[Josh Poimboeuf]

Objtool uses over 512k of stack, thanks to the hash table embedded in
the objtool_file struct.  This causes an unnecessarily large stack
allocation and breaks users with low stack limits.

Move the struct off the stack.

Fixes: 042ba73fe7eb ("objtool: Add several performance improvements")
Reported-by: Vassili Karpov <moos...@gmail.com>
Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
---
 tools/objtool/check.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 0414a0d52262..5dde107083c6 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2184,9 +2184,10 @@ static void cleanup(struct objtool_file *file)
        elf_close(file->elf);
 }
 
+static struct objtool_file file;
+
 int check(const char *_objname, bool orc)
 {
-       struct objtool_file file;
        int ret, warnings = 0;
 
        objname = _objname;
-- 
2.17.2