From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753068AbcEIUvh (ORCPT ); Mon, 9 May 2016 16:51:37 -0400 Received: from mga11.intel.com ([192.55.52.93]:21216 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752948AbcEIUvP (ORCPT ); Mon, 9 May 2016 16:51:15 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,601,1455004800"; d="scan'208";a="100071046" From: Yu-cheng Yu To: linux-kernel@vger.kernel.org, x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar Cc: Dave Hansen , Andy Lutomirski , Borislav Petkov , Sai Praneeth Prakhya , "Ravi V. Shankar" , Fenghua Yu , Yu-cheng Yu Subject: [PATCH v5 11/13] x86/xsaves: Add WARN_ON_FPU() when a disabled xstate component offset is requested for a compacted format Date: Mon, 9 May 2016 13:46:08 -0700 Message-Id: X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a warning in case a disabled (not existing) xstate component offset is requested. Signed-off-by: Yu-cheng Yu --- arch/x86/kernel/fpu/xstate.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index 350814c..2e6dbfe 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -756,6 +756,7 @@ void *__raw_xsave_addr(struct xregs_state *xsave, int xstate_feature_mask) { int feature_nr = fls64(xstate_feature_mask) - 1; + WARN_ON_FPU(using_compacted_format() && !xfeature_enabled(feature_nr)); return (void *)xsave + xstate_comp_offsets[feature_nr]; } -- 1.9.1