From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xD15j0S7PzDrFj for ; Fri, 21 Jul 2017 03:26:16 +1000 (AEST) Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v6KHNtI1061130 for ; Thu, 20 Jul 2017 13:26:14 -0400 Received: from e24smtp05.br.ibm.com (e24smtp05.br.ibm.com [32.104.18.26]) by mx0a-001b2d01.pphosted.com with ESMTP id 2bu01a2b86-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 20 Jul 2017 13:26:13 -0400 Received: from localhost by e24smtp05.br.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 20 Jul 2017 14:26:11 -0300 Received: from d24av01.br.ibm.com (d24av01.br.ibm.com [9.8.31.91]) by d24relay02.br.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v6KHQ8nk9896234 for ; Thu, 20 Jul 2017 14:26:08 -0300 Received: from d24av01.br.ibm.com (localhost [127.0.0.1]) by d24av01.br.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v6KHQ8S1021038 for ; Thu, 20 Jul 2017 14:26:08 -0300 From: Victor Aoqui To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, aneesh.kumar@linux.vnet.ibm.com, mpe@ellerman.id.au, khandual@linux.vnet.ibm.com Cc: victora@br.ibm.com, victora@linux.vnet.ibm.com, mauricfo@linux.vnet.ibm.com Subject: [PATCH] powerpc/kernel: Avoid preemption check during iommu_range_alloc Date: Thu, 20 Jul 2017 14:26:06 -0300 Message-Id: <20170720172606.3811-1-victora@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Replaced __this_cpu_read function call by raw_cpu_read in iommu_range_alloc function. Preemption doesn't need to be disabled since any CPU can safely use IOMMU pool. Signed-off-by: Victor Aoqui --- arch/powerpc/kernel/iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index 233ca3f..0e49a45 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -208,7 +208,7 @@ static unsigned long iommu_range_alloc(struct device *dev, * We don't need to disable preemption here because any CPU can * safely use any IOMMU pool. */ - pool_nr = __this_cpu_read(iommu_pool_hash) & (tbl->nr_pools - 1); + pool_nr = raw_cpu_read(iommu_pool_hash) & (tbl->nr_pools - 1); if (largealloc) pool = &(tbl->large_pool); -- 1.8.3.1