linux-kernel - [RFC PATCH 4/4] arm64: advertise CPU features using module aliases

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Date:	Thu,  7 Nov 2013 18:17:37 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, catalin.marinas@....com,
	will.deacon@....com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, steve.capper@...aro.org,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [RFC PATCH 4/4] arm64: advertise CPU features using module aliases

This enables the generic implementation in drivers/base/cpu.c
that allows modules to be loaded automatically based on the
optional features supported (and advertised) by the CPU.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
 arch/arm64/Kconfig        | 3 +++
 arch/arm64/kernel/setup.c | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c044548..50cd97f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -202,6 +202,9 @@ config ARCH_WANT_HUGE_PMD_SHARE
 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	def_bool y
 
+config ARCH_HAS_CPU_AUTOPROBE
+	def_bool y
+
 source "mm/Kconfig"
 
 config XEN_DOM0
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 780a7aa..90d5277 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -403,3 +403,5 @@ const struct seq_operations cpuinfo_op = {
 	.stop	= c_stop,
 	.show	= c_show
 };
+
+extern u32 cpu_features __attribute__((alias("elf_hwcap")));
-- 
1.8.3.2

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