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authorEmese Revfy <re.emese@gmail.com>2010-01-31 20:16:34 +0100
committerH. Peter Anvin <hpa@zytor.com>2010-02-01 11:20:43 -0800
commit3b9cfc0a99f88c0db7c72363620584a9b40b4543 (patch)
treef34b481d28eae0c04521a36c45bb50c1511cf5e6 /arch/x86/kernel/cpu/mtrr/main.c
parentab658321f32770b903a4426e2a6fae0392757755 (diff)
downloadop-kernel-dev-3b9cfc0a99f88c0db7c72363620584a9b40b4543.zip
op-kernel-dev-3b9cfc0a99f88c0db7c72363620584a9b40b4543.tar.gz
x86, mtrr: Constify struct mtrr_ops
This is part of the ops structure constification effort started by Arjan van de Ven et al. Benefits of this constification: * prevents modification of data that is shared (referenced) by many other structure instances at runtime * detects/prevents accidental (but not intentional) modification attempts on archs that enforce read-only kernel data at runtime * potentially better optimized code as the compiler can assume that the const data cannot be changed * the compiler/linker move const data into .rodata and therefore exclude them from false sharing Signed-off-by: Emese Revfy <re.emese@gmail.com> LKML-Reference: <4B65D712.3080804@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/cpu/mtrr/main.c')
-rw-r--r--arch/x86/kernel/cpu/mtrr/main.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 84e83de..fe4622e 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -60,14 +60,14 @@ static DEFINE_MUTEX(mtrr_mutex);
u64 size_or_mask, size_and_mask;
static bool mtrr_aps_delayed_init;
-static struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
+static const struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
-struct mtrr_ops *mtrr_if;
+const struct mtrr_ops *mtrr_if;
static void set_mtrr(unsigned int reg, unsigned long base,
unsigned long size, mtrr_type type);
-void set_mtrr_ops(struct mtrr_ops *ops)
+void set_mtrr_ops(const struct mtrr_ops *ops)
{
if (ops->vendor && ops->vendor < X86_VENDOR_NUM)
mtrr_ops[ops->vendor] = ops;
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