From: Greg Hackmann <ghackmann@google.com>
Date: Tue, 5 Aug 2014 23:14:27 +0000 (-0700)
Subject: arm64: restrict effects of ARMV7_COMPAT_CPUINFO to ARMv7 tasks
X-Git-Tag: firefly_0821_release~4090^2~205
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3868e7f8d47992922756d1aa6590f0d556c669b8;p=firefly-linux-kernel-4.4.55.git

arm64: restrict effects of ARMV7_COMPAT_CPUINFO to ARMv7 tasks

Since ARMV7_COMPAT_CPUINFO only exists to support existing ARMv7
binaries, restrict its effects to compat tasks

Bug: 16819658

Change-Id: I1092de596c7822d23f5f3f8a05b417a3cb49f593
Signed-off-by: Greg Hackmann <ghackmann@google.com>
---

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 18fcb7ca9b95..06aeec407b20 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -421,13 +421,19 @@ static int c_show(struct seq_file *m, void *v)
 		if (elf_hwcap & (1 << i))
 			seq_printf(m, "%s ", hwcap_str[i]);
 #ifdef CONFIG_ARMV7_COMPAT_CPUINFO
-	/* Print out the non-optional ARMv8 HW capabilities */
-	seq_printf(m, "wp half thumb fastmult vfp edsp neon vfpv3 tlsi ");
-	seq_printf(m, "vfpv4 idiva idivt ");
+	if (is_compat_task()) {
+		/* Print out the non-optional ARMv8 HW capabilities */
+		seq_printf(m, "wp half thumb fastmult vfp edsp neon vfpv3 tlsi ");
+		seq_printf(m, "vfpv4 idiva idivt ");
+	}
 #endif
 
 	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
-	seq_printf(m, "CPU architecture: 8\n");
+	seq_printf(m, "CPU architecture: %s\n",
+#if IS_ENABLED(CONFIG_ARMV7_COMPAT_CPUINFO)
+			is_compat_task() ? "8" :
+#endif
+			"AArch64");
 	seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
 	seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
 	seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);