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Mon, 08 Dec 2025 16:02:13 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay07.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 5B8G29Wj42402068 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 8 Dec 2025 16:02:09 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 88A5920043; Mon, 8 Dec 2025 16:02:09 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 90BEF20040; Mon, 8 Dec 2025 16:02:07 +0000 (GMT) Received: from [9.43.1.23] (unknown [9.43.1.23]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 8 Dec 2025 16:02:07 +0000 (GMT) Message-ID: <8141c6eb-f2b7-4a19-b637-af699bb8d5c4@linux.ibm.com> Date: Mon, 8 Dec 2025 21:32:06 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] powerpc64: make clang cross-build friendly To: Naveen N Rao Cc: linuxppc-dev , Madhavan Srinivasan , Christophe Leroy , Michael Ellerman , linux-trace-kernel@vger.kernel.org, Mark Rutland , Steven Rostedt , Masami Hiramatsu , llvm@lists.linux.dev, Maryam Moghadas References: <20251108210405.2375472-1-hbathini@linux.ibm.com> <20251108210405.2375472-2-hbathini@linux.ibm.com> Content-Language: en-US From: Hari Bathini In-Reply-To: Content-Type: text/plain; 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On 24/11/25 11:19 am, Naveen N Rao wrote: > On Sun, Nov 09, 2025 at 02:34:03AM +0530, Hari Bathini wrote: >> ARCH_USING_PATCHABLE_FUNCTION_ENTRY depends on toolchain support for >> -fpatchable-function-entry option. The current script that checks >> for this support only handles GCC. Rename the script and extend it >> to detect support for -fpatchable-function-entry with Clang as well, >> allowing clean cross-compilation with Clang toolchains. >> >> Signed-off-by: Hari Bathini >> --- >> arch/powerpc/Kconfig | 5 +++-- >> ...-function-entry.sh => check-fpatchable-function-entry.sh} | 0 >> 2 files changed, 3 insertions(+), 2 deletions(-) >> rename arch/powerpc/tools/{gcc-check-fpatchable-function-entry.sh => check-fpatchable-function-entry.sh} (100%) >> >> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >> index 325c1171894d..dfb62e211c92 100644 >> --- a/arch/powerpc/Kconfig >> +++ b/arch/powerpc/Kconfig >> @@ -568,8 +568,9 @@ config ARCH_USING_PATCHABLE_FUNCTION_ENTRY >> depends on FUNCTION_TRACER && (PPC32 || PPC64_ELF_ABI_V2) >> depends on $(cc-option,-fpatchable-function-entry=2) >> def_bool y if PPC32 >> - def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN >> - def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh $(CC) -mbig-endian) if PPC64 && CPU_BIG_ENDIAN >> + def_bool $(success,$(srctree)/arch/powerpc/tools/check-fpatchable-function-entry.sh $(CC) -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN && CC_IS_GCC >> + def_bool $(success,$(srctree)/arch/powerpc/tools/check-fpatchable-function-entry.sh $(CC) -target ppc64le -mlittle-endian) if PPC64 && CPU_LITTLE_ENDIAN && CC_IS_CLANG > > Can you instead pass $(CLANG_FLAGS) to retain the same command across > gcc/clang? Should work, I guess. But do I need to test for any additional clang flags that may interfere with what we are trying to check here? - Hari