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Mon, 20 Apr 2026 12:35:43 +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 12:35:43 +0000 (GMT) Message-ID: <898449ac-f7eb-4d52-a4e6-ff356fcba6c5@linux.ibm.com> Date: Mon, 20 Apr 2026 14:35:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 17/18] unwind_user/sframe/x86: Enable sframe unwinding on x86 To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, Steven Rostedt Cc: Josh Poimboeuf , Masami Hiramatsu , Mathieu Desnoyers , Peter Zijlstra , Ingo Molnar , Jiri Olsa , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Andrii Nakryiko , Indu Bhagat , "Jose E. 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Howlett" , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Heiko Carstens , Vasily Gorbik , "Steven Rostedt (Google)" References: <20260127150554.2760964-1-jremus@linux.ibm.com> <20260127150554.2760964-18-jremus@linux.ibm.com> Content-Language: en-US From: Jens Remus Organization: IBM Deutschland Research & Development GmbH In-Reply-To: <20260127150554.2760964-18-jremus@linux.ibm.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: h3AoDj-44Wmt0hRRhlhEyQIgXzwjY-6V X-Proofpoint-ORIG-GUID: MG0BEFiON0tlFDeZyKyNDhb7WjUzOo-N X-Authority-Analysis: v=2.4 cv=VP7tWdPX c=1 sm=1 tr=0 ts=69e61da6 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=0MvmVg10__VCTnNSAJcA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIwMDEyMSBTYWx0ZWRfX8/lw1wSomI2y lYC/8lq7Cy/Svc0dtCcdW472D061uFnbuNoa/VGW3T9O6YaynasdmU+Q3BEZ9OAGr9MpeyHd51m Pdk19TK/gCT9lYFLfkA6QvhkEZqrsmN8Xjcs1RMYLmLi/v7+ZBKN1Qai3qh+7kO4LFMBn2YqUnh aWHiYtPLP5GUvv0BryA+d+esOkhIMMSLWXVWgpi6SAQ5Y5x7m7C/QCX+CC1yNi0WIITN8/j50Tr 1P0SC2FqvLWHjht4FX/dHzpQgyOEnqgW8ngaS5qpHnuF8ltWklHRWd/JQP4S5XYrdutFDqCNajR JA1iRSu3Ax43sZ1tVl1TF7PwkDIMlwTFy/1BXxBXoff3VzrlVYRCB8+Rk/TnVESvtR76utaCtAR 2og6LL6euZqswjLM8xhfi4x01dibDabTTkyCCcGqrPNr1Tgo8s5uDSxCwOXVyBkjc2ESjbXiTFz Eihaj9aWs4OyRFvkWDA== 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=1011 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-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 78B3140007 X-Stat-Signature: 9migwsx6eajtbhw9z6phjw97izb846dc X-Rspam-User: X-HE-Tag: 1776688580-200789 X-HE-Meta: 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 1R3u40es mVpWEz0KVHPGxeUEhF2UPTOpezNZCGFu0WZiDIQrUc+D/ba0S84axahliAuR/aX1QC+2PLxPCVWKNIvXvJftlyKon3ImEiQhHDINOgplypSAuf0KXKfdaR5PMkFUR4FdTNztZLqWbgjBgSwSbKI3uEGjDIXN02vr2Bnnrpi9Di51Rd44K6N1ZwU1UxJQCglw8at2AMkEO2JdV3aeQUeu4Y5zftXecZy7SkT/pAoqn5CY3BWgDtHw9ZCtzpMBwxa4SBZMu/cApjk5AjJRLVQrcJJxQ7zmray85l9G4PB4On0zyz3MIuuF309WOaliHpfrHDrzvwiAaEANkSe9XpdY04LqoN52S0TFOKizwPwEnmhnEnMrRDmISrxnZP+6hYQk406QDK30g6t259E3YLI92osBoMUvZknJ55MgJ/fuVks5NBs7vjNYqislPq2GzX+6HR+nqOl4/jvJGq8w= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/27/2026 4:05 PM, Jens Remus wrote: > diff --git a/arch/x86/include/asm/unwind_user.h b/arch/x86/include/asm/unwind_user.h > @@ -15,6 +15,40 @@ static inline int unwind_user_word_size(struct pt_regs *regs) > return user_64bit_mode(regs) ? 8 : 4; > } > > +static inline int unwind_user_get_reg(unsigned long *val, unsigned int regnum) > +{ > +#ifdef CONFIG_X86_64 > + const struct pt_regs *regs = task_pt_regs(current); > + > + switch (regnum) { > + /* DWARF register numbers 0..15 */ > + case 0: *val = regs->ax; break; > + case 1: *val = regs->dx; break; > + case 2: *val = regs->cx; break; > + case 3: *val = regs->bx; break; > + case 4: *val = regs->si; break; > + case 5: *val = regs->di; break; > + case 6: *val = regs->bp; break; > + case 7: *val = regs->sp; break; > + case 8: *val = regs->r8; break; > + case 9: *val = regs->r9; break; > + case 10: *val = regs->r10; break; > + case 11: *val = regs->r11; break; > + case 12: *val = regs->r12; break; > + case 13: *val = regs->r13; break; > + case 14: *val = regs->r14; break; > + case 15: *val = regs->r15; break; > + default: > + return -EINVAL; > + } > + return 0; > +#else /* !CONFIG_X86_64 */ > + return -EINVAL; > +#endif /* !CONFIG_X86_64 */ > + Nit: Superfluous empty line. > +} > +#define unwind_user_get_reg unwind_user_get_reg > + > #endif /* CONFIG_UNWIND_USER */ > > #ifdef CONFIG_HAVE_UNWIND_USER_FP 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/