linux-kernel - [PATCH 12/10] powerpc: unbreak DYNAMIC

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Message-Id: <20190426190603.5982-2-linux@rasmusvillemoes.dk>
Date:   Fri, 26 Apr 2019 21:06:03 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     linuxppc-dev@...ts.ozlabs.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jason Baron <jbaron@...mai.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH 12/10] powerpc: unbreak DYNAMIC_DEBUG=y build with clang

Current versions of clang does not like the %c modifier in inline
assembly for targets other than x86, so any DYNAMIC_DEBUG=y build
fails on ppc64. A fix is likely to land in 9.0 (see
https://github.com/ClangBuiltLinux/linux/issues/456), but unbreak the
build for older versions.

Fixes: powerpc: select DYNAMIC_DEBUG_RELATIVE_POINTERS for PPC64
Reported-by: Nathan Chancellor <natechancellor@...il.com>
Reported-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
Andrew, please apply and/or fold into 10/10.

 arch/powerpc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 6821c8ae1d62..8511137ab963 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -155,7 +155,7 @@ config PPC
 	select BUILDTIME_EXTABLE_SORT
 	select CLONE_BACKWARDS
 	select DCACHE_WORD_ACCESS		if PPC64 && CPU_LITTLE_ENDIAN
-	select DYNAMIC_DEBUG_RELATIVE_POINTERS	if PPC64
+	select DYNAMIC_DEBUG_RELATIVE_POINTERS	if PPC64 && (CC_IS_GCC || CLANG_VERSION >= 90000)
 	select DYNAMIC_FTRACE			if FUNCTION_TRACER
 	select EDAC_ATOMIC_SCRUB
 	select EDAC_SUPPORT
-- 
2.20.1