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From: Pavo Banicevic <pavo.banicevic@sartura.hr>
To: linux@armlinux.org.uk, ast@kernel.org, daniel@iogearbox.net,
	andrii@kernel.org, kafai@fb.com, songliubraving@fb.com,
	yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org,
	nathan@kernel.org, ndesaulniers@google.com,
	ivan.khoronzhuk@linaro.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, clang-built-linux@googlegroups.com,
	matt.redfearn@mips.com, mingo@kernel.org, dvlasenk@redhat.com,
	juraj.vijtiuk@sartura.hr, robert.marko@sartura.hr,
	luka.perkov@sartura.hr, jakov.petrina@sartura.hr
Subject: [PATCH 2/3] arm: include: asm: unified: mask .syntax unified for clang
Date: Tue, 27 Jul 2021 16:11:18 +0200	[thread overview]
Message-ID: <20210727141119.19812-3-pavo.banicevic@sartura.hr> (raw)
In-Reply-To: <20210727141119.19812-1-pavo.banicevic@sartura.hr>

From: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>

The samples/bpf reuses linux headers, with clang -emit-llvm,
so this w/a is only for samples/bpf (samples/bpf/Makefile CLANG-bpf).

It allows to build samples/bpf for arm on target board.
In another way clang -emit-llvm generates errors like:

<inline asm>:1:1: error: unknown directive
.syntax unified

I have verified it on clang 5, 6, 7, 8, 9, 10
as on native platform as for cross-compiling. This decision is
arguable, but it doesn't have impact on samples/bpf so it's easier
just ignore it for clang, at least for now...

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
 arch/arm/include/asm/unified.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/unified.h b/arch/arm/include/asm/unified.h
index 1e2c3eb04353..8718f313e7c4 100644
--- a/arch/arm/include/asm/unified.h
+++ b/arch/arm/include/asm/unified.h
@@ -11,7 +11,9 @@
 #if defined(__ASSEMBLY__)
 	.syntax unified
 #else
-__asm__(".syntax unified");
+
+#ifndef __clang__
+	__asm__(".syntax unified");
 #endif
 
 #ifdef CONFIG_CPU_V7M
-- 
2.32.0


  parent reply	other threads:[~2021-07-27 14:12 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27 14:11 [PATCH 0/3] Address compilation of eBPF related software with clang compiler on arm architecture Pavo Banicevic
2021-07-27 14:11 ` [PATCH 1/3] arm: include: asm: swab: mask rev16 instruction for clang Pavo Banicevic
2021-07-27 15:46   ` Yonghong Song
2021-07-27 17:53   ` Nick Desaulniers
2021-07-27 21:43     ` Andrii Nakryiko
2021-07-27 14:11 ` Pavo Banicevic [this message]
2021-07-27 17:55   ` [PATCH 2/3] arm: include: asm: unified: mask .syntax unified " Nick Desaulniers
2021-07-27 14:11 ` [PATCH 3/3] include/uapi/linux/swab: Fix potentially missing __always_inline Pavo Banicevic
2021-07-28 13:49   ` Petr Vaněk

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