Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S938953AbcLVJlE (ORCPT ); Thu, 22 Dec 2016 04:41:04 -0500 Received: from mailapp01.imgtec.com ([195.59.15.196]:47578 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755631AbcLVJlC (ORCPT ); Thu, 22 Dec 2016 04:41:02 -0500 From: Marcin Nowakowski To: Arnd Bergmann , CC: Nicholas Piggin Subject: [PATCH 1/2] kbuild: keep __mcount_loc table through dead code elimination Date: Thu, 22 Dec 2016 09:51:46 +0100 Message-ID: <1482396707-14349-2-git-send-email-marcin.nowakowski@imgtec.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1482396707-14349-1-git-send-email-marcin.nowakowski@imgtec.com> References: <1482396707-14349-1-git-send-email-marcin.nowakowski@imgtec.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.80.2.5] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 916 Lines: 27 When CONFIG_LD_DEAD_CODE_DATA_ELIMINATION is enabled we must ensure __mcount_loc is preserved, as otherwise there are no valid entries for ftrace to work with. Fixes: 4b89b7f7aad5 ('kbuild: keep data tables through dead code elimination') Signed-off-by: Marcin Nowakowski Acked-by: Nicholas Piggin --- include/asm-generic/vmlinux.lds.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 0968d13..f492aa4 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -89,7 +89,7 @@ #ifdef CONFIG_FTRACE_MCOUNT_RECORD #define MCOUNT_REC() . = ALIGN(8); \ VMLINUX_SYMBOL(__start_mcount_loc) = .; \ - *(__mcount_loc) \ + KEEP(*(__mcount_loc)) \ VMLINUX_SYMBOL(__stop_mcount_loc) = .; #else #define MCOUNT_REC() -- 2.7.4