From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753977AbcBWJI4 (ORCPT ); Tue, 23 Feb 2016 04:08:56 -0500 Received: from terminus.zytor.com ([198.137.202.10]:57560 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751644AbcBWJIv (ORCPT ); Tue, 23 Feb 2016 04:08:51 -0500 Date: Tue, 23 Feb 2016 01:01:01 -0800 From: =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=@zytor.com Message-ID: Cc: acme@kernel.org, brgerst@gmail.com, hpa@zytor.com, bp@alien8.de, mingo@kernel.org, linux-kernel@vger.kernel.org, dvlasenk@redhat.com, bp@suse.de, jpoimboe@redhat.com, palves@redhat.com, namhyung@gmail.com, chris.j.arges@canonical.com, luto@kernel.org, tglx@linutronix.de, mmarek@suse.cz, torvalds@linux-foundation.org, luto@amacapital.net, akpm@linux-foundation.org, jslaby@suse.cz, peterz@infradead.org, bernd@petrovitsch.priv.at Reply-To: dvlasenk@redhat.com, bp@suse.de, linux-kernel@vger.kernel.org, palves@redhat.com, jpoimboe@redhat.com, brgerst@gmail.com, acme@kernel.org, hpa@zytor.com, bp@alien8.de, mingo@kernel.org, jslaby@suse.cz, akpm@linux-foundation.org, peterz@infradead.org, bernd@petrovitsch.priv.at, luto@kernel.org, chris.j.arges@canonical.com, namhyung@gmail.com, tglx@linutronix.de, mmarek@suse.cz, torvalds@linux-foundation.org, luto@amacapital.net In-Reply-To: References: To: =?UTF-8?B?bGludXgtdGlwLWNvbW1pdHNAdmdlci5rZXJuZWwub3Jn?=@zytor.com Subject: =?UTF-8?B?W3RpcDp4ODYvZGVidWddIHg4Ni9hc206IENyZWF0ZSBzdGFjayBmcmFtZXMgaW4=?= =?UTF-8?B?IHJ3c2VtIGZ1bmN0aW9ucw==?= Git-Commit-ID: =?UTF-8?B?ODU3NmNmNzYyYjZhYjlkNTNiNDQ0MjYyZTJkM2JhMmE3ZDM4MWMxOA==?= X-Mailer: =?UTF-8?B?dGlwLWdpdC1sb2ctZGFlbW9u?= Robot-ID: =?UTF-8?B?PHRpcC1ib3QuZ2l0Lmtlcm5lbC5vcmc+?= Robot-Unsubscribe: =?UTF-8?B?Q29udGFjdCA8bWFpbHRvOmhwYUBrZXJuZWwub3JnPiB0byBnZXQgYmxhY2tsaXM=?= =?UTF-8?B?dGVkIGZyb20gdGhlc2UgZW1haWxz?= MIME-Version: =?UTF-8?B?MS4w?= Content-Transfer-Encoding: =?UTF-8?B?OGJpdA==?= Content-Type: =?UTF-8?B?dGV4dC9wbGFpbjsgY2hhcnNldD1VVEYtOA==?= Content-Disposition: =?UTF-8?B?aW5saW5l?= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 8576cf762b6ab9d53b444262e2d3ba2a7d381c18 Gitweb: http://git.kernel.org/tip/8576cf762b6ab9d53b444262e2d3ba2a7d381c18 Author: Josh Poimboeuf AuthorDate: Thu, 21 Jan 2016 16:49:22 -0600 Committer: Ingo Molnar CommitDate: Tue, 23 Feb 2016 09:03:58 +0100 x86/asm: Create stack frames in rwsem functions rwsem.S has several callable non-leaf functions which don't honor CONFIG_FRAME_POINTER, which can result in bad stack traces. Create stack frames for them when CONFIG_FRAME_POINTER is enabled. Signed-off-by: Josh Poimboeuf Reviewed-by: Borislav Petkov Cc: Andrew Morton Cc: Andy Lutomirski Cc: Andy Lutomirski Cc: Arnaldo Carvalho de Melo Cc: Bernd Petrovitsch Cc: Borislav Petkov Cc: Brian Gerst Cc: Chris J Arges Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Jiri Slaby Cc: Linus Torvalds Cc: Michal Marek Cc: Namhyung Kim Cc: Pedro Alves Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/ad0932bbead975b15f9578e4f2cf2ee5961eb840.1453405861.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/lib/rwsem.S | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/x86/lib/rwsem.S b/arch/x86/lib/rwsem.S index 40027db..be110ef 100644 --- a/arch/x86/lib/rwsem.S +++ b/arch/x86/lib/rwsem.S @@ -15,6 +15,7 @@ #include #include +#include #define __ASM_HALF_REG(reg) __ASM_SEL(reg, e##reg) #define __ASM_HALF_SIZE(inst) __ASM_SEL(inst##w, inst##l) @@ -84,24 +85,29 @@ /* Fix up special calling conventions */ ENTRY(call_rwsem_down_read_failed) + FRAME_BEGIN save_common_regs __ASM_SIZE(push,) %__ASM_REG(dx) movq %rax,%rdi call rwsem_down_read_failed __ASM_SIZE(pop,) %__ASM_REG(dx) restore_common_regs + FRAME_END ret ENDPROC(call_rwsem_down_read_failed) ENTRY(call_rwsem_down_write_failed) + FRAME_BEGIN save_common_regs movq %rax,%rdi call rwsem_down_write_failed restore_common_regs + FRAME_END ret ENDPROC(call_rwsem_down_write_failed) ENTRY(call_rwsem_wake) + FRAME_BEGIN /* do nothing if still outstanding active readers */ __ASM_HALF_SIZE(dec) %__ASM_HALF_REG(dx) jnz 1f @@ -109,15 +115,18 @@ ENTRY(call_rwsem_wake) movq %rax,%rdi call rwsem_wake restore_common_regs -1: ret +1: FRAME_END + ret ENDPROC(call_rwsem_wake) ENTRY(call_rwsem_downgrade_wake) + FRAME_BEGIN save_common_regs __ASM_SIZE(push,) %__ASM_REG(dx) movq %rax,%rdi call rwsem_downgrade_wake __ASM_SIZE(pop,) %__ASM_REG(dx) restore_common_regs + FRAME_END ret ENDPROC(call_rwsem_downgrade_wake)