linux-kernel - [PATCH 2/3] arm: include: asm: unified: mask .syntax unified for clang

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Date:   Tue, 27 Jul 2021 16:11:18 +0200
From:   Pavo Banicevic <pavo.banicevic@...tura.hr>
To:     linux@...linux.org.uk, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com, ivan.khoronzhuk@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        clang-built-linux@...glegroups.com, matt.redfearn@...s.com,
        mingo@...nel.org, dvlasenk@...hat.com, juraj.vijtiuk@...tura.hr,
        robert.marko@...tura.hr, luka.perkov@...tura.hr,
        jakov.petrina@...tura.hr
Subject: [PATCH 2/3] arm: include: asm: unified: mask .syntax unified for clang

From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.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@...aro.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