From 87ecb582f0ac85886398dde8c3cdb2225cac7786 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Mon, 16 Mar 2020 15:47:27 +0100 Subject: [PATCH] objtool: Use sec_offset_hash() for insn_hash In preparation for find_insn_containing(), change insn_hash to use sec_offset_hash(). This actually reduces runtime; probably because mixing in the section index reduces the collisions due to text sections all starting their instructions at offset 0. Runtime on vmlinux.o from 3.1 to 2.5 seconds. Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Miroslav Benes Reviewed-by: Alexandre Chartre Acked-by: Josh Poimboeuf Link: https://lkml.kernel.org/r/20200416115119.227240432@infradead.org Signed-off-by: Ingo Molnar --- tools/objtool/check.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 87e528c..923652b 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -34,9 +34,10 @@ struct instruction *find_insn(struct objtool_file *file, { struct instruction *insn; - hash_for_each_possible(file->insn_hash, insn, hash, offset) + hash_for_each_possible(file->insn_hash, insn, hash, sec_offset_hash(sec, offset)) { if (insn->sec == sec && insn->offset == offset) return insn; + } return NULL; } @@ -282,7 +283,7 @@ static int decode_instructions(struct objtool_file *file) if (ret) goto err; - hash_add(file->insn_hash, &insn->hash, insn->offset); + hash_add(file->insn_hash, &insn->hash, sec_offset_hash(sec, insn->offset)); list_add_tail(&insn->list, &file->insn_list); nr_insns++; } -- 2.7.4