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Message-ID: <20161103184624.GA695@e104818-lin.cambridge.arm.com>
Date: Thu, 3 Nov 2016 18:46:25 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Artem Savkov <asavkov@...hat.com>
Cc: Suzuki K Poulose <Suzuki.Poulose@....com>,
Will Deacon <will.deacon@....com>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: arm64 build failure with CONFIG_ARM64_LSE_ATOMICS=y
On Thu, Nov 03, 2016 at 12:12:38PM +0100, Artem Savkov wrote:
> On Thu, Nov 03, 2016 at 10:39:43AM +0000, Suzuki K Poulose wrote:
> > On 02/11/16 23:28, Will Deacon wrote:
> > > On Wed, Nov 02, 2016 at 05:44:27PM +0100, Artem Savkov wrote:
> > > > Looks like your patch "efd9e03 arm64: Use static keys for CPU features"
> > > > breaks arm64 build with "CONFIG_ARM64_LSE_ATOMICS=y" because it creates a
> > > > circular dependency for asm/lse.h through jump_label.h:
[...]
> Apparently it fails with an older gcc (4.8.5), but doesn't with 6.2.0.
> The different bit is that with 4.8.5 I don't have CC_HAVE_ASM_GOTO set.
> It is reproducible with 6.2.0 if you manually remove CC_HAVE_ASM_GOTO.
-----------8<----------------
>From e27eb40cd5af38f1a5e64553a367220f00a1b5d8 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@....com>
Date: Thu, 3 Nov 2016 18:34:34 +0000
Subject: [PATCH] arm64: Fix circular include of asm/lse.h through
linux/jump_label.h
Commit efd9e03facd0 ("arm64: Use static keys for CPU features")
introduced support for static keys in asm/cpufeature.h, including
linux/jump_label.h. When CC_HAVE_ASM_GOTO is not defined, this causes a
circular dependency via linux/atomic.h, asm/lse.h and asm/cpufeature.h.
This patch moves the capability macros out out of asm/cpufeature.h into
a separate asm/cpucaps.h and modifies some of the #includes accordingly.
Fixes: efd9e03facd0 ("arm64: Use static keys for CPU features")
Reported-by: Artem Savkov <asavkov@...hat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
---
arch/arm64/include/asm/alternative.h | 2 +-
arch/arm64/include/asm/cpucaps.h | 40 ++++++++++++++++++++++++++++++++++++
arch/arm64/include/asm/cpufeature.h | 20 +-----------------
arch/arm64/include/asm/lse.h | 1 -
4 files changed, 42 insertions(+), 21 deletions(-)
create mode 100644 arch/arm64/include/asm/cpucaps.h
diff --git a/arch/arm64/include/asm/alternative.h b/arch/arm64/include/asm/alternative.h
index 39feb85a6931..6e1cb8c5af4d 100644
--- a/arch/arm64/include/asm/alternative.h
+++ b/arch/arm64/include/asm/alternative.h
@@ -1,7 +1,7 @@
#ifndef __ASM_ALTERNATIVE_H
#define __ASM_ALTERNATIVE_H
-#include <asm/cpufeature.h>
+#include <asm/cpucaps.h>
#include <asm/insn.h>
#ifndef __ASSEMBLY__
diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
new file mode 100644
index 000000000000..87b446535185
--- /dev/null
+++ b/arch/arm64/include/asm/cpucaps.h
@@ -0,0 +1,40 @@
+/*
+ * arch/arm64/include/asm/cpucaps.h
+ *
+ * Copyright (C) 2016 ARM Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CPUCAPS_H
+#define __ASM_CPUCAPS_H
+
+#define ARM64_WORKAROUND_CLEAN_CACHE 0
+#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1
+#define ARM64_WORKAROUND_845719 2
+#define ARM64_HAS_SYSREG_GIC_CPUIF 3
+#define ARM64_HAS_PAN 4
+#define ARM64_HAS_LSE_ATOMICS 5
+#define ARM64_WORKAROUND_CAVIUM_23154 6
+#define ARM64_WORKAROUND_834220 7
+#define ARM64_HAS_NO_HW_PREFETCH 8
+#define ARM64_HAS_UAO 9
+#define ARM64_ALT_PAN_NOT_UAO 10
+#define ARM64_HAS_VIRT_HOST_EXTN 11
+#define ARM64_WORKAROUND_CAVIUM_27456 12
+#define ARM64_HAS_32BIT_EL0 13
+#define ARM64_HYP_OFFSET_LOW 14
+#define ARM64_MISMATCHED_CACHE_LINE_SIZE 15
+
+#define ARM64_NCAPS 16
+
+#endif /* __ASM_CPUCAPS_H */
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index a27c3245ba21..0bc0b1de90c4 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -11,6 +11,7 @@
#include <linux/jump_label.h>
+#include <asm/cpucaps.h>
#include <asm/hwcap.h>
#include <asm/sysreg.h>
@@ -24,25 +25,6 @@
#define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap))
#define cpu_feature(x) ilog2(HWCAP_ ## x)
-#define ARM64_WORKAROUND_CLEAN_CACHE 0
-#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1
-#define ARM64_WORKAROUND_845719 2
-#define ARM64_HAS_SYSREG_GIC_CPUIF 3
-#define ARM64_HAS_PAN 4
-#define ARM64_HAS_LSE_ATOMICS 5
-#define ARM64_WORKAROUND_CAVIUM_23154 6
-#define ARM64_WORKAROUND_834220 7
-#define ARM64_HAS_NO_HW_PREFETCH 8
-#define ARM64_HAS_UAO 9
-#define ARM64_ALT_PAN_NOT_UAO 10
-#define ARM64_HAS_VIRT_HOST_EXTN 11
-#define ARM64_WORKAROUND_CAVIUM_27456 12
-#define ARM64_HAS_32BIT_EL0 13
-#define ARM64_HYP_OFFSET_LOW 14
-#define ARM64_MISMATCHED_CACHE_LINE_SIZE 15
-
-#define ARM64_NCAPS 16
-
#ifndef __ASSEMBLY__
#include <linux/kernel.h>
diff --git a/arch/arm64/include/asm/lse.h b/arch/arm64/include/asm/lse.h
index 23acc00be32d..fc756e22c84c 100644
--- a/arch/arm64/include/asm/lse.h
+++ b/arch/arm64/include/asm/lse.h
@@ -5,7 +5,6 @@
#include <linux/stringify.h>
#include <asm/alternative.h>
-#include <asm/cpufeature.h>
#ifdef __ASSEMBLER__
--
Catalin
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