From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752421Ab1AXE31 (ORCPT ); Sun, 23 Jan 2011 23:29:27 -0500 Received: from www.tglx.de ([62.245.132.106]:55500 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751773Ab1AXE3Y (ORCPT ); Sun, 23 Jan 2011 23:29:24 -0500 From: Sebastian Andrzej Siewior To: linux-kernel@vger.kernel.org Cc: sodaville@linutronix.de, x86@kernel.org, devicetree-discuss@lists.ozlabs.org, Sebastian Andrzej Siewior , Dirk Brandewie Subject: [PATCH TIP 01/14] x86/e820: remove conditional early mapping in parse_e820_ext Date: Mon, 24 Jan 2011 09:58:49 +0530 Message-Id: <1295843342-1122-2-git-send-email-bigeasy@linutronix.de> X-Mailer: git-send-email 1.7.3.2 In-Reply-To: <1295843342-1122-1-git-send-email-bigeasy@linutronix.de> References: <1295843342-1122-1-git-send-email-bigeasy@linutronix.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch ensures that the memory passed from parse_setup_data() is large enough to cover the complete data structure. That means that the conditional mapping in parse_e820_ext() can go. While here, I also attempt not to map two pages if the address is not aligned to a page boundary. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Dirk Brandewie --- arch/x86/include/asm/e820.h | 2 +- arch/x86/kernel/e820.c | 8 +------- arch/x86/kernel/setup.c | 18 +++++++++++++++--- 3 files changed, 17 insertions(+), 11 deletions(-) diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h index e99d55d..908b969 100644 --- a/arch/x86/include/asm/e820.h +++ b/arch/x86/include/asm/e820.h @@ -96,7 +96,7 @@ extern void e820_setup_gap(void); extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, unsigned long start_addr, unsigned long long end_addr); struct setup_data; -extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data); +extern void parse_e820_ext(struct setup_data *data); #if defined(CONFIG_X86_64) || \ (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION)) diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 294f26d..5fad626 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -667,21 +667,15 @@ __init void e820_setup_gap(void) * boot_params.e820_map, others are passed via SETUP_E820_EXT node of * linked list of struct setup_data, which is parsed here. */ -void __init parse_e820_ext(struct setup_data *sdata, unsigned long pa_data) +void __init parse_e820_ext(struct setup_data *sdata) { - u32 map_len; int entries; struct e820entry *extmap; entries = sdata->len / sizeof(struct e820entry); - map_len = sdata->len + sizeof(struct setup_data); - if (map_len > PAGE_SIZE) - sdata = early_ioremap(pa_data, map_len); extmap = (struct e820entry *)(sdata->data); __append_e820_map(extmap, entries); sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); - if (map_len > PAGE_SIZE) - early_iounmap(sdata, map_len); printk(KERN_INFO "extended physical RAM map:\n"); e820_print_map("extended"); } diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index d3cfe26..f8e7152 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -429,16 +429,28 @@ static void __init parse_setup_data(void) return; pa_data = boot_params.hdr.setup_data; while (pa_data) { - data = early_memremap(pa_data, PAGE_SIZE); + u32 data_len; + u32 map_len; + + map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK), + (u64)sizeof(struct setup_data)); + data = early_memremap(pa_data, map_len); + data_len = data->len + sizeof(struct setup_data); + if (data_len > map_len) { + early_iounmap(data, map_len); + data = early_memremap(pa_data, data_len); + map_len = data_len; + } + switch (data->type) { case SETUP_E820_EXT: - parse_e820_ext(data, pa_data); + parse_e820_ext(data); break; default: break; } pa_data = data->next; - early_iounmap(data, PAGE_SIZE); + early_iounmap(data, map_len); } } -- 1.7.3.2 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Andrzej Siewior Subject: [PATCH TIP 01/14] x86/e820: remove conditional early mapping in parse_e820_ext Date: Mon, 24 Jan 2011 09:58:49 +0530 Message-ID: <1295843342-1122-2-git-send-email-bigeasy@linutronix.de> References: <1295843342-1122-1-git-send-email-bigeasy@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1295843342-1122-1-git-send-email-bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: sodaville-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, Sebastian Andrzej Siewior List-Id: devicetree@vger.kernel.org This patch ensures that the memory passed from parse_setup_data() is large enough to cover the complete data structure. That means that the conditional mapping in parse_e820_ext() can go. While here, I also attempt not to map two pages if the address is not aligned to a page boundary. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Dirk Brandewie --- arch/x86/include/asm/e820.h | 2 +- arch/x86/kernel/e820.c | 8 +------- arch/x86/kernel/setup.c | 18 +++++++++++++++--- 3 files changed, 17 insertions(+), 11 deletions(-) diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h index e99d55d..908b969 100644 --- a/arch/x86/include/asm/e820.h +++ b/arch/x86/include/asm/e820.h @@ -96,7 +96,7 @@ extern void e820_setup_gap(void); extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, unsigned long start_addr, unsigned long long end_addr); struct setup_data; -extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data); +extern void parse_e820_ext(struct setup_data *data); #if defined(CONFIG_X86_64) || \ (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION)) diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 294f26d..5fad626 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -667,21 +667,15 @@ __init void e820_setup_gap(void) * boot_params.e820_map, others are passed via SETUP_E820_EXT node of * linked list of struct setup_data, which is parsed here. */ -void __init parse_e820_ext(struct setup_data *sdata, unsigned long pa_data) +void __init parse_e820_ext(struct setup_data *sdata) { - u32 map_len; int entries; struct e820entry *extmap; entries = sdata->len / sizeof(struct e820entry); - map_len = sdata->len + sizeof(struct setup_data); - if (map_len > PAGE_SIZE) - sdata = early_ioremap(pa_data, map_len); extmap = (struct e820entry *)(sdata->data); __append_e820_map(extmap, entries); sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); - if (map_len > PAGE_SIZE) - early_iounmap(sdata, map_len); printk(KERN_INFO "extended physical RAM map:\n"); e820_print_map("extended"); } diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index d3cfe26..f8e7152 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -429,16 +429,28 @@ static void __init parse_setup_data(void) return; pa_data = boot_params.hdr.setup_data; while (pa_data) { - data = early_memremap(pa_data, PAGE_SIZE); + u32 data_len; + u32 map_len; + + map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK), + (u64)sizeof(struct setup_data)); + data = early_memremap(pa_data, map_len); + data_len = data->len + sizeof(struct setup_data); + if (data_len > map_len) { + early_iounmap(data, map_len); + data = early_memremap(pa_data, data_len); + map_len = data_len; + } + switch (data->type) { case SETUP_E820_EXT: - parse_e820_ext(data, pa_data); + parse_e820_ext(data); break; default: break; } pa_data = data->next; - early_iounmap(data, PAGE_SIZE); + early_iounmap(data, map_len); } } -- 1.7.3.2