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arm64: apply __ro_after_init to some objects

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These objects are set during initialization, thereafter are read only.

Previously I only want to mark vdso_pages, vdso_spec, vectors_page and
cpu_ops as __read_mostly from performance point of view. Then inspired
by Kees's patch[1] to apply more __ro_after_init for arm, I think it's
better to mark them as __ro_after_init. What's more, I find some more
objects are also read only after init. So apply __ro_after_init to all
of them.

This patch also removes global vdso_pagelist and tries to clean up
vdso_spec[] assignment code.

[1] http://www.spinics.net/lists/arm-kernel/msg523188.html

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Jisheng Zhang
2016-08-15 14:45:46 +08:00
committed by Will Deacon
parent b6d081bddf
commit 5a9e3e156e
6 changed files with 26 additions and 21 deletions
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3
arch/arm64/mm/dma-mapping.c
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@@ -20,6 +20,7 @@
#include <linux/gfp.h>
#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/cache.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/genalloc.h>
@@ -30,7 +31,7 @@
#include <asm/cacheflush.h>
static int swiotlb __read_mostly;
static int swiotlb __ro_after_init;
static pgprot_t __get_dma_pgprot(unsigned long attrs, pgprot_t prot,
bool coherent)