arm64: capabilities: Use linear array for detection and verification

task #25552995

commit 606f8e7b27bfe30376348f8bc09cba17626dc24c upstream

Use the sorted list of capability entries for the detection and
verification.
Reviewed-by: NVladimir Murzin <vladimir.murzin@arm.com>
Tested-by: NVladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: NSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NZou Cao <zoucao@linux.alibaba.com>
Reviewed-by: Nluanshi <zhangliguang@linux.alibaba.com>

arch/arm64/kernel/cpufeature.c

@@ -1491,28 +1491,25 @@ static void __init setup_elf_hwcaps(const struct arm64_cpu_capabilities *hwcaps)
 			cap_set_elf_hwcap(hwcaps);
 }
 
-static void __update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
-				      u16 scope_mask, const char *info)
+static void update_cpu_capabilities(u16 scope_mask)
 {
+	int i;
+	const struct arm64_cpu_capabilities *caps;
+
 	scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
-	for (; caps->matches; caps++) {
-		if (!(caps->type & scope_mask) ||
+	for (i = 0; i < ARM64_NCAPS; i++) {
+		caps = cpu_hwcaps_ptrs[i];
+		if (!caps || !(caps->type & scope_mask) ||
+		    cpus_have_cap(caps->capability) ||
 		    !caps->matches(caps, cpucap_default_scope(caps)))
 			continue;
 
-		if (!cpus_have_cap(caps->capability) && caps->desc)
-			pr_info("%s %s\n", info, caps->desc);
+		if (caps->desc)
+			pr_info("detected: %s\n", caps->desc);
 		cpus_set_cap(caps->capability);
 	}
 }
 
-static void update_cpu_capabilities(u16 scope_mask)
-{
-	__update_cpu_capabilities(arm64_errata, scope_mask,
-				  "enabling workaround for");
-	__update_cpu_capabilities(arm64_features, scope_mask, "detected:");
-}
-
 static int __enable_cpu_capability(void *arg)
 {
 	const struct arm64_cpu_capabilities *cap = arg;
@@ -1576,16 +1573,17 @@ static void __init enable_cpu_capabilities(u16 scope_mask)
  *
  * Returns "false" on conflicts.
  */
-static bool
-__verify_local_cpu_caps(const struct arm64_cpu_capabilities *caps,
-			u16 scope_mask)
+static bool verify_local_cpu_caps(u16 scope_mask)
 {
+	int i;
 	bool cpu_has_cap, system_has_cap;
+	const struct arm64_cpu_capabilities *caps;
 
 	scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
 
-	for (; caps->matches; caps++) {
-		if (!(caps->type & scope_mask))
+	for (i = 0; i < ARM64_NCAPS; i++) {
+		caps = cpu_hwcaps_ptrs[i];
+		if (!caps || !(caps->type & scope_mask))
 			continue;
 
 		cpu_has_cap = caps->matches(caps, SCOPE_LOCAL_CPU);
@@ -1616,7 +1614,7 @@ __verify_local_cpu_caps(const struct arm64_cpu_capabilities *caps,
 		}
 	}
 
-	if (caps->matches) {
+	if (i < ARM64_NCAPS) {
 		pr_crit("CPU%d: Detected conflict for capability %d (%s), System: %d, CPU: %d\n",
 			smp_processor_id(), caps->capability,
 			caps->desc, system_has_cap, cpu_has_cap);
@@ -1626,12 +1624,6 @@ __verify_local_cpu_caps(const struct arm64_cpu_capabilities *caps,
 	return true;
 }
 
-static bool verify_local_cpu_caps(u16 scope_mask)
-{
-	return __verify_local_cpu_caps(arm64_errata, scope_mask) &&
-	       __verify_local_cpu_caps(arm64_features, scope_mask);
-}
-
 /*
  * Check for CPU features that are used in early boot
  * based on the Boot CPU value.