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Message-Id: <1253576808.7103.167.camel@pasglop>
Date: Tue, 22 Sep 2009 09:46:48 +1000
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Tim Abbott <tabbott@...lice.com>
Cc: Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Haavard Skinnemoen <hskinnemoen@...el.com>,
Paul Mackerras <paulus@...ba.org>,
Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH v4 4/4] Use macros for .data.page_aligned section.
On Sun, 2009-09-20 at 18:14 -0400, Tim Abbott wrote:
> This patch changes the remaining direct references to
> .data.page_aligned in C and assembly code to use the macros in
> include/linux/linkage.h.
>
> Signed-off-by: Tim Abbott <tabbott@...lice.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Haavard Skinnemoen <hskinnemoen@...el.com>
Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Sam Ravnborg <sam@...nborg.org>
> ---
> arch/avr32/mm/init.c | 4 +---
> arch/powerpc/kernel/vdso.c | 3 ++-
> arch/powerpc/kernel/vdso32/vdso32_wrapper.S | 3 ++-
> arch/powerpc/kernel/vdso64/vdso64_wrapper.S | 3 ++-
> arch/s390/kernel/vdso.c | 2 +-
> arch/s390/kernel/vdso32/vdso32_wrapper.S | 3 ++-
> arch/s390/kernel/vdso64/vdso64_wrapper.S | 3 ++-
> arch/x86/include/asm/cache.h | 4 +++-
> arch/x86/kernel/head_32.S | 2 +-
> 9 files changed, 16 insertions(+), 11 deletions(-)
>
> diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c
> index e819fa6..cc60d10 100644
> --- a/arch/avr32/mm/init.c
> +++ b/arch/avr32/mm/init.c
> @@ -24,11 +24,9 @@
> #include <asm/setup.h>
> #include <asm/sections.h>
>
> -#define __page_aligned __attribute__((section(".data.page_aligned")))
> -
> DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
>
> -pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned;
> +pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_data;
>
> struct page *empty_zero_page;
> EXPORT_SYMBOL(empty_zero_page);
> diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
> index a0abce2..3faaf29 100644
> --- a/arch/powerpc/kernel/vdso.c
> +++ b/arch/powerpc/kernel/vdso.c
> @@ -1,3 +1,4 @@
> +
> /*
> * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
> * <benh@...nel.crashing.org>
> @@ -74,7 +75,7 @@ static int vdso_ready;
> static union {
> struct vdso_data data;
> u8 page[PAGE_SIZE];
> -} vdso_data_store __attribute__((__section__(".data.page_aligned")));
> +} vdso_data_store __page_aligned_data;
> struct vdso_data *vdso_data = &vdso_data_store.data;
>
> /* Format of the patch table */
> diff --git a/arch/powerpc/kernel/vdso32/vdso32_wrapper.S b/arch/powerpc/kernel/vdso32/vdso32_wrapper.S
> index 556f0ca..6e8f507 100644
> --- a/arch/powerpc/kernel/vdso32/vdso32_wrapper.S
> +++ b/arch/powerpc/kernel/vdso32/vdso32_wrapper.S
> @@ -1,7 +1,8 @@
> #include <linux/init.h>
> +#include <linux/linkage.h>
> #include <asm/page.h>
>
> - .section ".data.page_aligned"
> + __PAGE_ALIGNED_DATA
>
> .globl vdso32_start, vdso32_end
> .balign PAGE_SIZE
> diff --git a/arch/powerpc/kernel/vdso64/vdso64_wrapper.S b/arch/powerpc/kernel/vdso64/vdso64_wrapper.S
> index 0529cb9..b8553d6 100644
> --- a/arch/powerpc/kernel/vdso64/vdso64_wrapper.S
> +++ b/arch/powerpc/kernel/vdso64/vdso64_wrapper.S
> @@ -1,7 +1,8 @@
> #include <linux/init.h>
> +#include <linux/linkage.h>
> #include <asm/page.h>
>
> - .section ".data.page_aligned"
> + __PAGE_ALIGNED_DATA
>
> .globl vdso64_start, vdso64_end
> .balign PAGE_SIZE
> diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
> index 45e1708..45a3e9a 100644
> --- a/arch/s390/kernel/vdso.c
> +++ b/arch/s390/kernel/vdso.c
> @@ -75,7 +75,7 @@ __setup("vdso=", vdso_setup);
> static union {
> struct vdso_data data;
> u8 page[PAGE_SIZE];
> -} vdso_data_store __attribute__((__section__(".data.page_aligned")));
> +} vdso_data_store __page_aligned_data;
> struct vdso_data *vdso_data = &vdso_data_store.data;
>
> /*
> diff --git a/arch/s390/kernel/vdso32/vdso32_wrapper.S b/arch/s390/kernel/vdso32/vdso32_wrapper.S
> index 61639a8..ae42f8c 100644
> --- a/arch/s390/kernel/vdso32/vdso32_wrapper.S
> +++ b/arch/s390/kernel/vdso32/vdso32_wrapper.S
> @@ -1,7 +1,8 @@
> #include <linux/init.h>
> +#include <linux/linkage.h>
> #include <asm/page.h>
>
> - .section ".data.page_aligned"
> + __PAGE_ALIGNED_DATA
>
> .globl vdso32_start, vdso32_end
> .balign PAGE_SIZE
> diff --git a/arch/s390/kernel/vdso64/vdso64_wrapper.S b/arch/s390/kernel/vdso64/vdso64_wrapper.S
> index d8e2ac1..c245842 100644
> --- a/arch/s390/kernel/vdso64/vdso64_wrapper.S
> +++ b/arch/s390/kernel/vdso64/vdso64_wrapper.S
> @@ -1,7 +1,8 @@
> #include <linux/init.h>
> +#include <linux/linkage.h>
> #include <asm/page.h>
>
> - .section ".data.page_aligned"
> + __PAGE_ALIGNED_DATA
>
> .globl vdso64_start, vdso64_end
> .balign PAGE_SIZE
> diff --git a/arch/x86/include/asm/cache.h b/arch/x86/include/asm/cache.h
> index 5d367ca..549860d 100644
> --- a/arch/x86/include/asm/cache.h
> +++ b/arch/x86/include/asm/cache.h
> @@ -1,6 +1,8 @@
> #ifndef _ASM_X86_CACHE_H
> #define _ASM_X86_CACHE_H
>
> +#include <linux/linkage.h>
> +
> /* L1 cache line size */
> #define L1_CACHE_SHIFT (CONFIG_X86_L1_CACHE_SHIFT)
> #define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
> @@ -13,7 +15,7 @@
> #ifdef CONFIG_SMP
> #define __cacheline_aligned_in_smp \
> __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT)))) \
> - __attribute__((__section__(".data.page_aligned")))
> + __page_aligned_data
> #endif
> #endif
>
> diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
> index 1dac239..218aad7 100644
> --- a/arch/x86/kernel/head_32.S
> +++ b/arch/x86/kernel/head_32.S
> @@ -626,7 +626,7 @@ ENTRY(empty_zero_page)
> * This starts the data section.
> */
> #ifdef CONFIG_X86_PAE
> -.section ".data.page_aligned","wa"
> +__PAGE_ALIGNED_DATA
> /* Page-aligned for the benefit of paravirt? */
> .align PAGE_SIZE_asm
> ENTRY(swapper_pg_dir)
--
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