arm64: change compat_elf_hwcap and compat_elf_hwcap2 prefix to a32

maillist inclusion
category: feature
bugzilla: 46790
CVE: NA

Reference: https://github.com/norov/linux/commits/ilp32-5.2

--------------------------------

ILP32 patch series introduces new type of binaries which is also compat.
So rename existung aarch32 compat_elf_hwcap's helps to avoid confusing.
Signed-off-by: NYury Norov <ynorov@caviumnetworks.com>
Signed-off-by: NYury Norov <ynorov@marvell.com>

 Conflicts:
	arch/arm64/kernel/cpuinfo.c
	drivers/clocksource/arm_arch_timer.c
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>

arch/arm64/include/asm/arch_timer.h

@@ -235,7 +235,7 @@ static inline void arch_timer_set_evtstrm_feature(void)
 {
 	cpu_set_named_feature(EVTSTRM);
 #ifdef CONFIG_AARCH32_EL0
-	compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
+	a32_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
 #endif
 }
 

arch/arm64/include/asm/hwcap.h

@@ -114,7 +114,7 @@
 #define ELF_HWCAP2		cpu_get_elf_hwcap2()
 
 #ifdef CONFIG_AARCH32_EL0
-extern unsigned int compat_elf_hwcap, compat_elf_hwcap2;
+extern unsigned int a32_elf_hwcap, a32_elf_hwcap2;
 #endif
 
 enum {

arch/arm64/kernel/binfmt_elf32.c

@@ -20,8 +20,8 @@
 })
 
 #define COMPAT_ARCH_DLINFO
-#define COMPAT_ELF_HWCAP		(compat_elf_hwcap)
-#define COMPAT_ELF_HWCAP2		(compat_elf_hwcap2)
+#define COMPAT_ELF_HWCAP		(a32_elf_hwcap)
+#define COMPAT_ELF_HWCAP2		(a32_elf_hwcap2)
 
 #define compat_arch_setup_additional_pages \
 					aarch32_setup_additional_pages

arch/arm64/kernel/cpufeature.c

@@ -85,13 +85,13 @@
 static unsigned long elf_hwcap __read_mostly;
 
 #ifdef CONFIG_AARCH32_EL0
-#define COMPAT_ELF_HWCAP_DEFAULT	\
+#define AARCH32_EL0_ELF_HWCAP_DEFAULT	\
 				(COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
 				 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
 				 COMPAT_HWCAP_TLS|COMPAT_HWCAP_IDIV|\
 				 COMPAT_HWCAP_LPAE)
-unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
-unsigned int compat_elf_hwcap2 __read_mostly;
+unsigned int a32_elf_hwcap __read_mostly = AARCH32_EL0_ELF_HWCAP_DEFAULT;
+unsigned int a32_elf_hwcap2 __read_mostly;
 #endif
 
 DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
@@ -2306,10 +2306,10 @@ static void __init cap_set_elf_hwcap(const struct arm64_cpu_capabilities *cap)
 		break;
 #ifdef CONFIG_AARCH32_EL0
 	case CAP_COMPAT_HWCAP:
-		compat_elf_hwcap |= (u32)cap->hwcap;
+		a32_elf_hwcap |= (u32)cap->hwcap;
 		break;
 	case CAP_COMPAT_HWCAP2:
-		compat_elf_hwcap2 |= (u32)cap->hwcap;
+		a32_elf_hwcap2 |= (u32)cap->hwcap;
 		break;
 #endif
 	default:
@@ -2329,10 +2329,10 @@ static bool cpus_have_elf_hwcap(const struct arm64_cpu_capabilities *cap)
 		break;
 #ifdef CONFIG_AARCH32_EL0
 	case CAP_COMPAT_HWCAP:
-		rc = (compat_elf_hwcap & (u32)cap->hwcap) != 0;
+		rc = (a32_elf_hwcap & (u32)cap->hwcap) != 0;
 		break;
 	case CAP_COMPAT_HWCAP2:
-		rc = (compat_elf_hwcap2 & (u32)cap->hwcap) != 0;
+		rc = (a32_elf_hwcap2 & (u32)cap->hwcap) != 0;
 		break;
 #endif
 	default:

arch/arm64/kernel/cpuinfo.c

@@ -136,7 +136,7 @@ static const char *const compat_hwcap2_str[] = {
 static int c_show(struct seq_file *m, void *v)
 {
 	int i, j;
-	bool compat = personality(current->personality) == PER_LINUX32;
+	bool aarch32 = personality(current->personality) == PER_LINUX32;
 
 	for_each_online_cpu(i) {
 		struct cpuinfo_arm64 *cpuinfo = &per_cpu(cpu_data, i);
@@ -148,7 +148,7 @@ static int c_show(struct seq_file *m, void *v)
 		 * "processor".  Give glibc what it expects.
 		 */
 		seq_printf(m, "processor\t: %d\n", i);
-		if (compat)
+		if (aarch32)
 			seq_printf(m, "model name\t: ARMv8 Processor rev %d (%s)\n",
 				   MIDR_REVISION(midr), COMPAT_ELF_PLATFORM);
 
@@ -163,10 +163,10 @@ static int c_show(struct seq_file *m, void *v)
 		 * software which does already (at least for 32-bit).
 		 */
 		seq_puts(m, "Features\t:");
-		if (compat) {
+		if (aarch32) {
 #ifdef CONFIG_AARCH32_EL0
 			for (j = 0; j < ARRAY_SIZE(compat_hwcap_str); j++) {
-				if (compat_elf_hwcap & (1 << j)) {
+				if (a32_elf_hwcap & (1 << j)) {
 					/*
 					 * Warn once if any feature should not
 					 * have been present on arm64 platform.
@@ -179,7 +179,7 @@ static int c_show(struct seq_file *m, void *v)
 			}
 
 			for (j = 0; j < ARRAY_SIZE(compat_hwcap2_str); j++)
-				if (compat_elf_hwcap2 & (1 << j))
+				if (a32_elf_hwcap2 & (1 << j))
 					seq_printf(m, " %s", compat_hwcap2_str[j]);
 #endif /* CONFIG_AARCH32_EL0 */
 		} else {