From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758322AbXK0AOz (ORCPT ); Mon, 26 Nov 2007 19:14:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756943AbXK0AOb (ORCPT ); Mon, 26 Nov 2007 19:14:31 -0500 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:45344 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756871AbXK0AOa (ORCPT ); Mon, 26 Nov 2007 19:14:30 -0500 Message-Id: <20071127001429.395567674@sgi.com> References: <20071127001407.859743255@sgi.com> User-Agent: quilt/0.46-1 Date: Mon, 26 Nov 2007 16:14:08 -0800 From: Christoph Lameter To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers Subject: [patch 01/14] Modules: Handle symbols that have a zero value Content-Disposition: inline; filename=weaky Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org The module subsystem cannot handle symbols that are zero. If symbols are present that have a zero value then the module resolver prints out a message that these symbols are unresolved. [patch already in mm] Cc: Mathieu Desnoyers Signed-off-by: Christoph Lameter --- kernel/module.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) Index: linux-2.6/kernel/module.c =================================================================== --- linux-2.6.orig/kernel/module.c 2007-11-21 12:58:33.095608448 -0800 +++ linux-2.6/kernel/module.c 2007-11-21 13:00:30.199108674 -0800 @@ -285,7 +285,7 @@ static unsigned long __find_symbol(const } } DEBUGP("Failed to find symbol %s\n", name); - return 0; + return -ENOENT; } /* Search for module by name: must hold module_mutex. */ @@ -756,7 +756,7 @@ void __symbol_put(const char *symbol) const unsigned long *crc; preempt_disable(); - if (!__find_symbol(symbol, &owner, &crc, 1)) + if (IS_ERR_VALUE(__find_symbol(symbol, &owner, &crc, 1))) BUG(); module_put(owner); preempt_enable(); @@ -902,7 +902,8 @@ static inline int check_modstruct_versio const unsigned long *crc; struct module *owner; - if (!__find_symbol("struct_module", &owner, &crc, 1)) + if (IS_ERR_VALUE(__find_symbol("struct_module", + &owner, &crc, 1))) BUG(); return check_version(sechdrs, versindex, "struct_module", mod, crc); @@ -955,7 +956,7 @@ static unsigned long resolve_symbol(Elf_ /* use_module can fail due to OOM, or module unloading */ if (!check_version(sechdrs, versindex, name, mod, crc) || !use_module(mod, owner)) - ret = 0; + ret = -EINVAL; } return ret; } @@ -1348,14 +1349,16 @@ static int verify_export_symbols(struct const unsigned long *crc; for (i = 0; i < mod->num_syms; i++) - if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) { + if (!IS_ERR_VALUE(__find_symbol(mod->syms[i].name, + &owner, &crc, 1))) { name = mod->syms[i].name; ret = -ENOEXEC; goto dup; } for (i = 0; i < mod->num_gpl_syms; i++) - if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) { + if (!IS_ERR_VALUE(__find_symbol(mod->gpl_syms[i].name, + &owner, &crc, 1))) { name = mod->gpl_syms[i].name; ret = -ENOEXEC; goto dup; @@ -1405,7 +1408,7 @@ static int simplify_symbols(Elf_Shdr *se strtab + sym[i].st_name, mod); /* Ok if resolved. */ - if (sym[i].st_value != 0) + if (!IS_ERR_VALUE(sym[i].st_value)) break; /* Ok if weak. */ if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) --