linux-kernel - Re: [PATCHv2 2/7] acpi: change the topo of acpi_table

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Date:   Fri, 11 Jan 2019 13:30:37 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Pingfan Liu <kernelfans@...il.com>
CC:     <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Yinghai Lu <yinghai@...nel.org>,
        Tejun Heo <tj@...nel.org>, Baoquan He <bhe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>, <x86@...nel.org>,
        <linux-acpi@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCHv2 2/7] acpi: change the topo of acpi_table_upgrade()

On Fri, Jan 11, 2019 at 01:12:52PM +0800, Pingfan Liu wrote:
>The current acpi_table_upgrade() relies on initrd_start, but this var is
>only valid after relocate_initrd(). There is requirement to extract the
>acpi info from initrd before memblock-allocator can work(see [2/4]), hence
>acpi_table_upgrade() need to accept the input param directly.
>
>Signed-off-by: Pingfan Liu <kernelfans@...il.com>
>Acked-by: "Rafael J. Wysocki" <rjw@...ysocki.net>
>Cc: Thomas Gleixner <tglx@...utronix.de>
>Cc: Ingo Molnar <mingo@...hat.com>
>Cc: Borislav Petkov <bp@...en8.de>
>Cc: "H. Peter Anvin" <hpa@...or.com>
>Cc: Dave Hansen <dave.hansen@...ux.intel.com>
>Cc: Andy Lutomirski <luto@...nel.org>
>Cc: Peter Zijlstra <peterz@...radead.org>
>Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
>Cc: Len Brown <lenb@...nel.org>
>Cc: Yinghai Lu <yinghai@...nel.org>
>Cc: Tejun Heo <tj@...nel.org>
>Cc: Chao Fan <fanc.fnst@...fujitsu.com>
>Cc: Baoquan He <bhe@...hat.com>
>Cc: Juergen Gross <jgross@...e.com>
>Cc: Andrew Morton <akpm@...ux-foundation.org>
>Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
>Cc: Vlastimil Babka <vbabka@...e.cz>
>Cc: Michal Hocko <mhocko@...e.com>
>Cc: x86@...nel.org
>Cc: linux-acpi@...r.kernel.org
>Cc: linux-mm@...ck.org
>---
> arch/arm64/kernel/setup.c | 2 +-
> arch/x86/kernel/setup.c   | 2 +-
> drivers/acpi/tables.c     | 4 +---
> include/linux/acpi.h      | 4 ++--
> 4 files changed, 5 insertions(+), 7 deletions(-)
>
>diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
>index f4fc1e0..bc4b47d 100644
>--- a/arch/arm64/kernel/setup.c
>+++ b/arch/arm64/kernel/setup.c
>@@ -315,7 +315,7 @@ void __init setup_arch(char **cmdline_p)
> 	paging_init();
> 	efi_apply_persistent_mem_reservations();
> 
>-	acpi_table_upgrade();
>+	acpi_table_upgrade((void *)initrd_start, initrd_end - initrd_start);
> 
> 	/* Parse the ACPI tables for possible boot-time configuration */
> 	acpi_boot_table_init();
>diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
>index ac432ae..dc8fc5d 100644
>--- a/arch/x86/kernel/setup.c
>+++ b/arch/x86/kernel/setup.c
>@@ -1172,8 +1172,8 @@ void __init setup_arch(char **cmdline_p)
> 
> 	reserve_initrd();
> 
>-	acpi_table_upgrade();
> 
I wonder whether this will cause two blank lines together.

Thanks,
Chao Fan

>+	acpi_table_upgrade((void *)initrd_start, initrd_end - initrd_start);
> 	vsmp_init();
> 
> 	io_delay_init();
>diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
>index 61203ee..84e0a79 100644
>--- a/drivers/acpi/tables.c
>+++ b/drivers/acpi/tables.c
>@@ -471,10 +471,8 @@ static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
> 
> #define MAP_CHUNK_SIZE   (NR_FIX_BTMAPS << PAGE_SHIFT)
> 
>-void __init acpi_table_upgrade(void)
>+void __init acpi_table_upgrade(void *data, size_t size)
> {
>-	void *data = (void *)initrd_start;
>-	size_t size = initrd_end - initrd_start;
> 	int sig, no, table_nr = 0, total_offset = 0;
> 	long offset = 0;
> 	struct acpi_table_header *table;
>diff --git a/include/linux/acpi.h b/include/linux/acpi.h
>index ed80f14..0b6e0b6 100644
>--- a/include/linux/acpi.h
>+++ b/include/linux/acpi.h
>@@ -1254,9 +1254,9 @@ acpi_graph_get_remote_endpoint(const struct fwnode_handle *fwnode,
> #endif
> 
> #ifdef CONFIG_ACPI_TABLE_UPGRADE
>-void acpi_table_upgrade(void);
>+void acpi_table_upgrade(void *data, size_t size);
> #else
>-static inline void acpi_table_upgrade(void) { }
>+static inline void acpi_table_upgrade(void *data, size_t size) { }
> #endif
> 
> #if defined(CONFIG_ACPI) && defined(CONFIG_ACPI_WATCHDOG)
>-- 
>2.7.4
>
>
>