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x86/mtrr: Allocate mtrr_value array dynamically

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The mtrr_value[] array is a static variable which is used only in a few
configurations. Consuming 6kB is ridiculous for this case, especially as
the array doesn't need to be that large and it can easily be allocated
dynamically.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20230502120931.20719-10-jgross@suse.com
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
This commit is contained in:
Juergen Gross 2023-05-02 14:09:24 +02:00 committed by Borislav Petkov (AMD)
parent b5d3c72829
commit 961c6a4326
1 changed files with 7 additions and 1 deletions
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8
arch/x86/kernel/cpu/mtrr/legacy.c
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@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/syscore_ops.h>
#include <asm/cpufeature.h>
#include <asm/mtrr.h>
@ -38,12 +39,15 @@ struct mtrr_value {
unsigned long lsize;
};
static struct mtrr_value mtrr_value[MTRR_MAX_VAR_RANGES];
static struct mtrr_value *mtrr_value;
static int mtrr_save(void)
{
int i;
if (!mtrr_value)
return -ENOMEM;
for (i = 0; i < num_var_ranges; i++) {
mtrr_if->get(i, &mtrr_value[i].lbase,
&mtrr_value[i].lsize,
@ -72,6 +76,8 @@ static struct syscore_ops mtrr_syscore_ops = {
void mtrr_register_syscore(void)
{
mtrr_value = kcalloc(num_var_ranges, sizeof(*mtrr_value), GFP_KERNEL);
/*
* The CPU has no MTRR and seems to not support SMP. They have
* specific drivers, we use a tricky method to support