From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yx0-f188.google.com ([209.85.210.188]:39818 "EHLO mail-yx0-f188.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752522Ab0AGGpn (ORCPT ); Thu, 7 Jan 2010 01:45:43 -0500 Received: by yxe26 with SMTP id 26so17437143yxe.4 for ; Wed, 06 Jan 2010 22:45:42 -0800 (PST) From: Cheng Renquan Subject: [PATCH] kallsyms: skip kernel symbols when lookup in module Date: Thu, 7 Jan 2010 14:43:46 +0800 Message-Id: <1262846626-27109-1-git-send-email-crquan@gmail.com> Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: Michal Marek Cc: linux-kbuild@vger.kernel.org kernel symbols lookup is expensive, when we know it's a lookup in module, we can skip the heavy kernel symbols. Signed-off-by: Cheng Renquan --- kernel/kallsyms.c | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c index 8e5288a..bb9fdc5 100644 --- a/kernel/kallsyms.c +++ b/kernel/kallsyms.c @@ -173,12 +173,16 @@ unsigned long kallsyms_lookup_name(const char *name) unsigned long i; unsigned int off; - for (i = 0, off = 0; i < kallsyms_num_syms; i++) { - off = kallsyms_expand_symbol(off, namebuf); + /* if a colon ':' found, skip the heavy kernel symbols */ + if (strchr(name, ':') == NULL) { + for (i = 0, off = 0; i < kallsyms_num_syms; i++) { + off = kallsyms_expand_symbol(off, namebuf); - if (strcmp(namebuf, name) == 0) - return kallsyms_addresses[i]; + if (strcmp(namebuf, name) == 0) + return kallsyms_addresses[i]; + } } + return module_kallsyms_lookup_name(name); } EXPORT_SYMBOL_GPL(kallsyms_lookup_name); -- 1.6.5