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Mon, 20 Apr 2026 12:44:12 +0000 (GMT) Received: from [9.111.165.155] (unknown [9.111.165.155]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 20 Apr 2026 12:44:12 +0000 (GMT) Message-ID: Date: Mon, 20 Apr 2026 14:44:12 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/8] arm64, unwind: build kernel with sframe V3 info To: Dylan Hatch , Roman Gushchin , Weinan Liu , Will Deacon , Josh Poimboeuf , Indu Bhagat , Peter Zijlstra , Steven Rostedt , Catalin Marinas , Jiri Kosina Cc: Mark Rutland , Prasanna Kumar T S M , Puranjay Mohan , Song Liu , joe.lawrence@redhat.com, linux-toolchains@vger.kernel.org, linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Heiko Carstens References: <20260406185000.1378082-1-dylanbhatch@google.com> <20260406185000.1378082-3-dylanbhatch@google.com> Content-Language: en-US From: Jens Remus Organization: IBM Deutschland Research & Development GmbH In-Reply-To: <20260406185000.1378082-3-dylanbhatch@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: sYb2gOO-Kty_hcHJ4lggRM0jGT1GRwgl X-Proofpoint-ORIG-GUID: N0mT8Q_-HvWlkK3pou6GvGjoGn0eYW_j X-Authority-Analysis: v=2.4 cv=VP7tWdPX c=1 sm=1 tr=0 ts=69e61fa1 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=1XWaLZrsAAAA:8 a=yMhMjlubAAAA:8 a=ArCyXBQMZrod6OsQSOkA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIwMDEyMSBTYWx0ZWRfX70pvcDTs/5Fc Z4vrNYCmOf8wb89We6H2dW95tzwZuREzf5DAE7Cc1ReDjcbpNu7Y1Aisap+RYg0pW/wfOcc1ezg AKypvWmbIoigyi81EtHGrMPZYB8po7uuSVWZnVR4gjEXjVcYeP7IX2+h949i/23Ji7TsrDWhoNW 3Lra4fs3xUqvYvN+CJU7TYhn+fNPw0wczl9EQU+3om+5X5CZyrE2NceAUyZQw6TGRCAABZi6Eyd lvLJcdvNGErwYSzfGTGa+lF+UaEFZ0nXphNSkmZglegaZmN5/XfJtSrKakT+SdSjW+ShSreuCzQ 9IxyMusxMfpapu6jjfe4v5qCIOICJZjtuUtOXhJKr+S0lFmeXX4a3aUK/NHKLZMAVndxa5ibbuS q0GmAXlwPvSJFStVr8czU1mbaj73r0G4h+t/zgVTcx0XSgdEWmF6peSv3Pt0+/Df4AS9wXUqFvd MZlHVt5uuzCBpgcgRLg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-20_02,2026-04-17_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 suspectscore=0 priorityscore=1501 adultscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604200121 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260420_054435_729043_83402C99 X-CRM114-Status: GOOD ( 14.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 4/6/2026 8:49 PM, Dylan Hatch wrote: > Build with -Wa,--gsframe-3 flags to generate a .sframe section. This > will be used for in-kernel reliable stacktrace in cases where the frame > pointer alone is insufficient. > > Currently, the sframe format only supports arm64, x86_64 and s390x > architectures. > > Signed-off-by: Weinan Liu > Signed-off-by: Dylan Hatch > Reviewed-by: Prasanna Kumar T S M > diff --git a/arch/arm64/include/asm/unwind_sframe.h b/arch/arm64/include/asm/unwind_sframe.h > @@ -0,0 +1,12 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +#ifndef _ASM_ARM64_UNWIND_SFRAME_H > +#define _ASM_ARM64_UNWIND_SFRAME_H > + > +#ifdef CONFIG_ARM64 Nit: If I am not mistaken above guard for CONFIG_ARM64 is superfluous, as this resides in arch/arm64/ anyway. x86 needs to guard with CONFIG_X86_64, as only x86 64-bit supports SFrame (and not x86 32-bit nor x86 X32). > + > +#define SFRAME_REG_SP 31 > +#define SFRAME_REG_FP 29 > + > +#endif > + > +#endif /* _ASM_ARM64_UNWIND_SFRAME_H */ Regards, Jens -- Jens Remus Linux on Z Development (D3303) jremus@de.ibm.com / jremus@linux.ibm.com IBM Deutschland Research & Development GmbH; Vorsitzender des Aufsichtsrats: Wolfgang Wendt; Geschäftsführung: David Faller; Sitz der Gesellschaft: Ehningen; Registergericht: Amtsgericht Stuttgart, HRB 243294 IBM Data Privacy Statement: https://www.ibm.com/privacy/