arm64: Add COMPAT_HWCAP_LPAE

Commit a469abd0f868 (ARM: elf: add new hwcap for identifying atomic
ldrd/strd instructions) introduces HWCAP_ELF for 32-bit ARM
applications. As LPAE is always present on arm64, report the
corresponding compat HWCAP to user space.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org> # 3.11+
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h
index 024c461..0ad7351 100644 (file)
--- a/arch/arm64/include/asm/hwcap.h
+++ b/arch/arm64/include/asm/hwcap.h
@@ -30,6 +30,7 @@
 #define COMPAT_HWCAP_IDIVA     (1 << 17)
 #define COMPAT_HWCAP_IDIVT     (1 << 18)
 #define COMPAT_HWCAP_IDIV      (COMPAT_HWCAP_IDIVA|COMPAT_HWCAP_IDIVT)
+#define COMPAT_HWCAP_LPAE      (1 << 20)
 #define COMPAT_HWCAP_EVTSTRM   (1 << 21)
 
 #define COMPAT_HWCAP2_AES      (1 << 0)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 831c97f..2e17bd3 100644 (file)
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -73,7 +73,8 @@ EXPORT_SYMBOL_GPL(elf_hwcap);
                                 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
                                 COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
                                 COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
-                                COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
+                                COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\
+                                COMPAT_HWCAP_LPAE)
 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
 unsigned int compat_elf_hwcap2 __read_mostly;
 #endif