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Tue, 28 Oct 2025 08:58:52 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4086720043; Tue, 28 Oct 2025 08:58:52 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2969C20040; Tue, 28 Oct 2025 08:58:50 +0000 (GMT) Received: from [9.98.111.108] (unknown [9.98.111.108]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTPS; Tue, 28 Oct 2025 08:58:49 +0000 (GMT) Message-ID: <14872f86-43d4-42af-b3c0-233d220757ba@linux.ibm.com> Date: Tue, 28 Oct 2025 14:28:48 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] powerpc/vmlinux.lds: Drop .interp description To: Vishal Chourasia , Nathan Chancellor Cc: Michael Ellerman , Nicholas Piggin , Christophe Leroy , Nick Desaulniers , Bill Wendling , Justin Stitt , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev References: <20251018-ppc-fix-lld-interp-v1-1-a083de6dccc9@kernel.org> Content-Language: en-US From: Madhavan Srinivasan In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=JqL8bc4C c=1 sm=1 tr=0 ts=690085cf cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=CCpqsmhAAAAA:8 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=ZHSnkM3jP7rn7XZgXOwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=ul9cdbp4aOFLsgKbc677:22 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-GUID: JhZA-HjLs4FesaqE-SdsyT7TJQidPFYA X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDI1MDAxOSBTYWx0ZWRfX+e5rNKalrEtu sstqnuW7/EWyOgklSY5o+3DCvntg0HMNPUXxaHc5tGpvDPze7NkZ9E3q4zZzFhHRvdD8dsBHlTb bzI6w6JK9rTF9fPaNMGkJZ+NXHqM6xQnUlo4EK3eR8QkhtBr0V4qYPHJIGEFgi7PAKJwie6V7Ig RacVWAnwtHNUl9bgFMqmXCMsdpBfDcLmg1fSwDBLMHorqmglajh35XRH+gGJAz91FfMP0hkuGvq TbqEWsl0BFrrlw6a8HJjHXPG52R/6HRD5oXLkNHo+2ITSViKmXI5uPP7TjkaXkILMx9Xx7/XOmT 4b+BuKuUNCXH3hNACAjhXBMJ3jV2FtVePhoRbj3E/0gvQS1QPlcKEyj3SdIoxTwhw6bcNjLPa10 6QO1yyfpxh7KyNNjMMBFBt1jVW/thg== X-Proofpoint-ORIG-GUID: cxNoZzKk-Ut4WXoJsD0wx_seiJzDlGA1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-28_03,2025-10-22_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1011 lowpriorityscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 spamscore=0 adultscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510250019 Will pick it up. Thanks Maddy On 10/27/25 1:16 PM, Vishal Chourasia wrote: > ping. > > what's the status for this patch? > > vishalc > > > On Tue, Oct 21, 2025 at 01:48:31PM +0530, Vishal Chourasia wrote: >> On Sat, Oct 18, 2025 at 06:52:40PM +0100, Nathan Chancellor wrote: >>> Commit da30705c4621 ("arch/powerpc: Remove .interp section in vmlinux") >>> intended to drop the .interp section from vmlinux but even with this >>> change, relocatable kernels linked with ld.lld contain an empty .interp >>> section, which ends up causing crashes in GDB [1]. >>> >>> $ make -skj"$(nproc)" ARCH=powerpc LLVM=1 clean pseries_le_defconfig vmlinux >>> >>> $ llvm-readelf -S vmlinux | grep interp >>> [44] .interp PROGBITS c0000000021ddb34 21edb34 000000 00 A 0 0 1 >>> >>> There appears to be a subtle difference between GNU ld and ld.lld when >>> it comes to discarding sections that specify load addresses [2]. >>> >>> Since '--no-dynamic-linker' prevents emission of the .interp section, >>> there is no need to describe it in the output sections of the vmlinux >>> linker script. Drop the .interp section description from vmlinux.lds.S >>> to avoid this issue altogether. >>> >>> Link: https://sourceware.org/bugzilla/show_bug.cgi?id=33481 [1] >>> Link: https://github.com/ClangBuiltLinux/linux/issues/2137 [2] >>> Reported-by: Vishal Chourasia >>> Closes: https://lore.kernel.org/20251013040148.560439-1-vishalc@linux.ibm.com/ >>> Signed-off-by: Nathan Chancellor >>> --- >>> arch/powerpc/kernel/vmlinux.lds.S | 1 - >>> 1 file changed, 1 deletion(-) >>> >>> diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S >>> index de6ee7d35cff..15850296c0a9 100644 >>> --- a/arch/powerpc/kernel/vmlinux.lds.S >>> +++ b/arch/powerpc/kernel/vmlinux.lds.S >>> @@ -330,7 +330,6 @@ SECTIONS >>> } >>> .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) } >>> .gnu.hash : AT(ADDR(.gnu.hash) - LOAD_OFFSET) { *(.gnu.hash) } >>> - .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) } >>> .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET) >>> { >>> __rela_dyn_start = .; >>> >>> --- >>> base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787 >>> change-id: 20251018-ppc-fix-lld-interp-1a78c361cd42 >>> >> With this patch, I don't see .interp section being emitted the final >> vmlinux binary. >> >> ``` >> (i) ❯ make LLVM=1 vmlinux >> (i) ❯ llvm-readelf -p .comment vmlinux >> >> String dump of section '.comment': >> [ 1] clang version 22.0.0git (https://github.com/llvm/llvm-project.git 7314565281ec28b745502c3f429fd431e16673eb) >> [ 6d] Linker: LLD 22.0.0 (https://github.com/llvm/llvm-project.git 7314565281ec28b745502c3f429fd431e16673eb) >> >> (i) ❯ llvm-readelf -p .interp vmlinux >> llvm-readelf: warning: 'vmlinux': could not find section '.interp' >> ``` >> >> Tested-by: Vishal Chourasia