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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 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 3VoYZ8OBYWh4UKYG15cGMyvtUlt8UbYU X-Proofpoint-ORIG-GUID: 3VoYZ8OBYWh4UKYG15cGMyvtUlt8UbYU X-Authority-Analysis: v=2.4 cv=AdS83nXG c=1 sm=1 tr=0 ts=6936f686 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=9ecn0eQcEfoHkOsjxl0A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjA2MDAwMCBTYWx0ZWRfX20e1KMPfjCzU sl1Tls4Skrmeb8cKZrsTRMO82pcOBFOy2K7eaqqzNwgfJxiADrmBb8NqkNw+k8ZVHCDG694L4jJ CEkZUevYquiDMYLX1+KSvM0wd5WcEylRDOxRo2G+h5HvYQHv80eYsI14E9GA0Jf16LC3VUmjHuc rd/NF48SiutBsbtVVCOcFks53nIG7JMsN2YVnDiFyOp4Fx/+Rf+EGxg9u7DjCVLaN/hU4MsM+aa ZPwkO+N6ccEk8by9KSTMq1EVi6GuV6WGgLIqyIOe5hwTA7oy0DnvYKJ7ZikEfWFNC19mqQBYfYr Vv3fcotaJ6bZ+AqcbAL7xFQlZ7kFss01JFKy9zrmEtcI8jm/uXRvqp5+hrJ8UOdcGmyUKzDeUtX u1h+L3DDvtN1zMnOgRSYLvbSNUNrEA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-06_02,2025-12-04_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 priorityscore=1501 spamscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 malwarescore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2512060000 Thanks for the review, Naveen. 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