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arm64: avoid -Woverride-init warning 

The icache_policy_str[] definition causes a warning when extra
warning flags are enabled:

arch/arm64/kernel/cpuinfo.c:38:26: warning: initialized field overwritten [-Woverride-init]
   38 |  [ICACHE_POLICY_VIPT]  = "VIPT",
      |                          ^~~~~~
arch/arm64/kernel/cpuinfo.c:38:26: note: (near initialization for 'icache_policy_str[2]')
arch/arm64/kernel/cpuinfo.c:39:26: warning: initialized field overwritten [-Woverride-init]
   39 |  [ICACHE_POLICY_PIPT]  = "PIPT",
      |                          ^~~~~~
arch/arm64/kernel/cpuinfo.c:39:26: note: (near initialization for 'icache_policy_str[3]')
arch/arm64/kernel/cpuinfo.c:40:27: warning: initialized field overwritten [-Woverride-init]
   40 |  [ICACHE_POLICY_VPIPT]  = "VPIPT",
      |                           ^~~~~~~
arch/arm64/kernel/cpuinfo.c:40:27: note: (near initialization for 'icache_policy_str[0]')

There is no real need for the default initializer here, as printing a
NULL string is harmless. Rewrite the logic to have an explicit
reserved value for the only one that uses the default value.

This partially reverts the commit that removed ICACHE_POLICY_AIVIVT.

Fixes: 155433cb36 ("arm64: cache: Remove support for ASID-tagged VIVT I-caches")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20201026193807.3816388-1-arnd@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Arnd Bergmann 2020-10-26 20:37:46 +01:00 committed by Will Deacon
parent 1de111b51b
commit 332576e69a
2 changed files with 5 additions and 3 deletions
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1
arch/arm64/include/asm/cache.h
View File

@ -24,6 +24,7 @@
#define CTR_L1IP(ctr) (((ctr) >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK)
#define ICACHE_POLICY_VPIPT 0
#define ICACHE_POLICY_RESERVED 1
#define ICACHE_POLICY_VIPT 2
#define ICACHE_POLICY_PIPT 3

7
arch/arm64/kernel/cpuinfo.c
View File

@ -34,10 +34,10 @@ DEFINE_PER_CPU(struct cpuinfo_arm64, cpu_data);
static struct cpuinfo_arm64 boot_cpu_data;
static const char *icache_policy_str[] = {
[0 ... ICACHE_POLICY_PIPT] = "RESERVED/UNKNOWN",
[ICACHE_POLICY_VPIPT] = "VPIPT",
[ICACHE_POLICY_RESERVED] = "RESERVED/UNKNOWN",
[ICACHE_POLICY_VIPT] = "VIPT",
[ICACHE_POLICY_PIPT] = "PIPT",
[ICACHE_POLICY_VPIPT] = "VPIPT",
};
unsigned long __icache_flags;
@ -334,10 +334,11 @@ static void cpuinfo_detect_icache_policy(struct cpuinfo_arm64 *info)
case ICACHE_POLICY_VPIPT:
set_bit(ICACHEF_VPIPT, &__icache_flags);
break;
default:
case ICACHE_POLICY_RESERVED:
case ICACHE_POLICY_VIPT:
/* Assume aliasing */
set_bit(ICACHEF_ALIASING, &__icache_flags);
break;
}
pr_info("Detected %s I-cache on CPU%d\n", icache_policy_str[l1ip], cpu);