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-rw-r--r--arch/arm64/kernel/setup.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 67da30741a1..b105a0540d7 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -25,6 +25,7 @@
#include <linux/utsname.h>
#include <linux/initrd.h>
#include <linux/console.h>
+#include <linux/cache.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/screen_info.h>
@@ -197,6 +198,8 @@ static void __init setup_processor(void)
{
struct cpu_info *cpu_info;
u64 features, block;
+ u32 cwg;
+ int cls;
cpu_info = lookup_processor_type(read_cpuid_id());
if (!cpu_info) {
@@ -214,6 +217,18 @@ static void __init setup_processor(void)
elf_hwcap = 0;
/*
+ * Check for sane CTR_EL0.CWG value.
+ */
+ cwg = cache_type_cwg();
+ cls = cache_line_size();
+ if (!cwg)
+ pr_warn("No Cache Writeback Granule information, assuming cache line size %d\n",
+ cls);
+ if (L1_CACHE_BYTES < cls)
+ pr_warn("L1_CACHE_BYTES smaller than the Cache Writeback Granule (%d < %d)\n",
+ L1_CACHE_BYTES, cls);
+
+ /*
* ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks.
* The blocks we test below represent incremental functionality
* for non-negative values. Negative values are reserved.