From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933966AbcHJU35 (ORCPT ); Wed, 10 Aug 2016 16:29:57 -0400 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:40437 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932985AbcHJSTb (ORCPT ); Wed, 10 Aug 2016 14:19:31 -0400 From: Jisheng Zhang To: , , CC: , , Jisheng Zhang Subject: [PATCH 2/3] arm64: vdso: put read only/mostly objects into proper sections Date: Wed, 10 Aug 2016 15:19:18 +0800 Message-ID: <1470813559-2917-3-git-send-email-jszhang@marvell.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1470813559-2917-1-git-send-email-jszhang@marvell.com> References: <1470813559-2917-1-git-send-email-jszhang@marvell.com> MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-08-10_05:,, signatures=0 X-Proofpoint-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1608100080 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org vdso_pages and vdso_spec are initialized by vdso_init(), thereafter are mostly read during vdso special mapping handling. vectors_page is initialized by alloc_vectors_page(), thereafter is mostly read during aarch32 vectors special mapping handling. The fact that they are mostly read and not written to makes them candidates for __read_mostly declarations. The vm_special_mapping spec is never modified, so mark it as const. This patch also removes global vdso_pagelist. Signed-off-by: Jisheng Zhang --- arch/arm64/kernel/vdso.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index e320e8f..e62da76 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -37,8 +37,7 @@ #include extern char vdso_start, vdso_end; -static unsigned long vdso_pages; -static struct page **vdso_pagelist; +static unsigned long vdso_pages __read_mostly; /* * The vDSO data page. @@ -53,7 +52,7 @@ struct vdso_data *vdso_data = &vdso_data_store.data; /* * Create and map the vectors page for AArch32 tasks. */ -static struct page *vectors_page[1]; +static struct page *vectors_page[1] __read_mostly; static int __init alloc_vectors_page(void) { @@ -88,7 +87,7 @@ int aarch32_setup_vectors_page(struct linux_binprm *bprm, int uses_interp) { struct mm_struct *mm = current->mm; unsigned long addr = AARCH32_VECTORS_BASE; - static struct vm_special_mapping spec = { + static const struct vm_special_mapping spec = { .name = "[vectors]", .pages = vectors_page, @@ -110,11 +109,19 @@ int aarch32_setup_vectors_page(struct linux_binprm *bprm, int uses_interp) } #endif /* CONFIG_COMPAT */ -static struct vm_special_mapping vdso_spec[2]; +static struct vm_special_mapping vdso_spec[2] __read_mostly = { + { + .name = "[vvar]", + }, + { + .name = "[vdso]", + }, +}; static int __init vdso_init(void) { int i; + struct page **vdso_pagelist; if (memcmp(&vdso_start, "\177ELF", 4)) { pr_err("vDSO is not a valid ELF object!\n"); @@ -138,16 +145,8 @@ static int __init vdso_init(void) for (i = 0; i < vdso_pages; i++) vdso_pagelist[i + 1] = pfn_to_page(PHYS_PFN(__pa(&vdso_start)) + i); - /* Populate the special mapping structures */ - vdso_spec[0] = (struct vm_special_mapping) { - .name = "[vvar]", - .pages = vdso_pagelist, - }; - - vdso_spec[1] = (struct vm_special_mapping) { - .name = "[vdso]", - .pages = &vdso_pagelist[1], - }; + vdso_spec[0].pages = vdso_pagelist; + vdso_spec[1].pages = &vdso_pagelist[1]; return 0; } -- 2.8.1