From nobody Fri Dec 26 11:18:33 2025 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD77A328B3 for ; Fri, 5 Jan 2024 16:37:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="iPcTdpyM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1704472638; x=1736008638; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=nNShzR6tVlt8MP2GEm4twbSrn0rdHKZew4twsigGRgc=; b=iPcTdpyM5oDb3a9mJ9Wwa7KTc9/1yj5pV+pzMgzW2X6E+3IUPYTJrcqW ZAGGKgjKRTX40rZ0c5Lul7JTyZcvgRL7V8NrLKLPDdoRAtHbH/99CUs4U BdS0R+BdozZhC/vzcbwQ5QBmcSSCtKEQjL1zso621RXTzxMDjTGiCO3EQ uzuaOw5lgITxrYQ5oiYeGuj9mzWch7CNYRNVn9qU4AH5VbHL45nW6adZf WToPgcFgfeVtUy3ui4jDre2zfMBtwv60DUsYiWNL+qtL6pmx0slwbthja ZzmSlgbneg4J8DHcSRjMHH5tjoUehdh+97z1AeuYYHWzfVeAtQAhycdgJ g==; X-IronPort-AV: E=McAfee;i="6600,9927,10944"; a="463931765" X-IronPort-AV: E=Sophos;i="6.04,334,1695711600"; d="scan'208";a="463931765" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jan 2024 08:37:18 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10944"; a="953991189" X-IronPort-AV: E=Sophos;i="6.04,334,1695711600"; d="scan'208";a="953991189" Received: from tassilo.jf.intel.com ([10.54.38.190]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jan 2024 08:37:18 -0800 From: Andi Kleen To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Andi Kleen Subject: [PATCH] x86/mtrr: Check if fixed MTRRs exist before saving them Date: Fri, 5 Jan 2024 08:37:11 -0800 Message-ID: <20240105163711.9278-1-ak@linux.intel.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This one place forgot to check the fixed capability. Signed-off-by: Andi Kleen --- arch/x86/kernel/cpu/mtrr/mtrr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.c b/arch/x86/kernel/cpu/mtrr/mtr= r.c index 767bf1c71aad..2a2fc14955cd 100644 --- a/arch/x86/kernel/cpu/mtrr/mtrr.c +++ b/arch/x86/kernel/cpu/mtrr/mtrr.c @@ -609,7 +609,7 @@ void mtrr_save_state(void) { int first_cpu; =20 - if (!mtrr_enabled()) + if (!mtrr_enabled() || !mtrr_state.have_fixed) return; =20 first_cpu =3D cpumask_first(cpu_online_mask); --=20 2.43.0