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Tue, 5 May 2026 12:17:23 +0000 (GMT) From: Jens Remus To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Steven Rostedt , Josh Poimboeuf , Indu Bhagat , Peter Zijlstra , Dylan Hatch , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Mathieu Desnoyers , Kees Cook , Sam James Cc: Jens Remus , bpf@vger.kernel.org, linux-mm@kvack.org, Namhyung Kim , Andrii Nakryiko , "Jose E. Marchesi" , Beau Belgrave , Florian Weimer , "Carlos O'Donell" , Masami Hiramatsu , Jiri Olsa , Arnaldo Carvalho de Melo , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Heiko Carstens , Vasily Gorbik , Ilya Leoshkevich , "Steven Rostedt (Google)" Subject: [PATCH v14 07/19] unwind_user/sframe: Wire up unwind_user to sframe Date: Tue, 5 May 2026 14:17:06 +0200 Message-ID: <20260505121718.3572346-8-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260505121718.3572346-1-jremus@linux.ibm.com> References: <20260505121718.3572346-1-jremus@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: LBHznMHNrGwcMIVAjy5FTSmb0VZFbhh9 X-Proofpoint-GUID: iMK_zE08jUSeI2qYJTeWXZRqSR2k0krj X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA1MDExNCBTYWx0ZWRfXywHpJhLi2dEn P9AYd5vJFwFBj0+QRrHYpUfiE+qsWW8lwgPfGnTbYrZ00nCVd4cVw13LfK5s1O+tqWVdchKQslK P4iR3E6GuDFf42quEGZwgu2CjLxSkt2L44ESlTNYSxJQCqp9A4nS4cOAiQ2pkR5IZPE/fFk1VeH Ppl2kp2xH17XuTsAgd6F0apNsu9Pk6Uu06A9SnfxcnXeqLVLAnVq2/GzfZSeZLyRKuOQxY2/3Ey qbuRpwUyaU3cA079v56RztjzEqB6/TbBlDf7BNq6APTgO9RAmbChK+go9kOHT9muzzeRNe5F8/p OwaEq73tBWmeq+z7x0oW0x8GHFuuiUVtas0zTiKF42wcb7pK9+Rs2EO78dvX97hdm7l2EuRmrEN jdsw7wtnZLzh0qhZHZxxIRHNa4XB6tIbdx/zFRoArcVSgpGE4u38Cf+t73M0M+Bbjcw12Z1HUce 6mkwA8D02yA9a3vywMA== X-Authority-Analysis: v=2.4 cv=UbFhjqSN c=1 sm=1 tr=0 ts=69f9dfd9 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=ItKwCHsCKAUqeRWvWoIA:9 a=2JgSa4NbpEOStq-L5dxp:22 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=2026-05-05_02,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 adultscore=0 priorityscore=1501 bulkscore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605050114 X-Stat-Signature: zncqb61f53qq5goaq5e4jwyjmmde5x4m X-Rspamd-Queue-Id: 146A8160016 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1777984350-636539 X-HE-Meta: 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 Y1xSabnG S2+VEvvgCFWWRROeK+vP8IbXzYJI2GCuEJHKlK6dXsBd3fq08nGVYCNL3D3oRsSk3hiJW0J0pEMgOOOf9T8OmTOfgxJVnNEDQ3leVR9q4Gykd58xdWbntbPldbiMid5QZRfW7S77eyzvrhn4R4n0FhDFnR3kp2CjJGcHRqcpFlvZHV518TsayeGLuMG8yEldbnEDWVhWdHhZo1QzQZO+p4yNdT5gsFZCX7AR0D2GwUzq95wV3HBgvcGcAuQ+vworaS5vBBNemtbNJPAUuwFp0agnTCuq4iZzWMEFtVOtnlriBlUZE1rSeG2q2BFpHc6UTEnUD8AQjRQJgATBFLMA1ZhC62vvNDB2mgliSVQDbR0VSMrDFFQZTXB6oGMadjWmsMhF2CcwhlJ48YCpnvdp42XzVvdrQsDRUkmNo22nAUiDzh1nRNxw/b7Ge4vqvgmEsn3Z5 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Josh Poimboeuf Now that the sframe infrastructure is fully in place, make it work by hooking it up to the unwind_user interface. [ Jens Remus: Remove unused pt_regs from unwind_user_next_common() and its callers. Simplify unwind_user_next_sframe(). ] Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) Reviewed-by: Indu Bhagat Signed-off-by: Jens Remus --- arch/Kconfig | 1 + include/linux/unwind_user_types.h | 4 +++- kernel/unwind/user.c | 23 +++++++++++++++++++++++ 3 files changed, 27 insertions(+), 1 deletion(-) diff --git a/arch/Kconfig b/arch/Kconfig index 94b2d5e8e529..37549832bd1f 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -488,6 +488,7 @@ config HAVE_UNWIND_USER_FP config HAVE_UNWIND_USER_SFRAME bool + select UNWIND_USER config HAVE_PERF_REGS bool diff --git a/include/linux/unwind_user_types.h b/include/linux/unwind_user_types.h index 412729a269bc..43e4b160883f 100644 --- a/include/linux/unwind_user_types.h +++ b/include/linux/unwind_user_types.h @@ -9,7 +9,8 @@ * available. */ enum unwind_user_type_bits { - UNWIND_USER_TYPE_FP_BIT = 0, + UNWIND_USER_TYPE_SFRAME_BIT = 0, + UNWIND_USER_TYPE_FP_BIT = 1, NR_UNWIND_USER_TYPE_BITS, }; @@ -17,6 +18,7 @@ enum unwind_user_type_bits { enum unwind_user_type { /* Type "none" for the start of stack walk iteration. */ UNWIND_USER_TYPE_NONE = 0, + UNWIND_USER_TYPE_SFRAME = BIT(UNWIND_USER_TYPE_SFRAME_BIT), UNWIND_USER_TYPE_FP = BIT(UNWIND_USER_TYPE_FP_BIT), }; diff --git a/kernel/unwind/user.c b/kernel/unwind/user.c index 90ab3c1a205e..1fb272419733 100644 --- a/kernel/unwind/user.c +++ b/kernel/unwind/user.c @@ -7,6 +7,7 @@ #include #include #include +#include #define for_each_user_frame(state) \ for (unwind_user_start(state); !(state)->done; unwind_user_next(state)) @@ -82,6 +83,16 @@ static int unwind_user_next_fp(struct unwind_user_state *state) return unwind_user_next_common(state, &fp_frame); } +static int unwind_user_next_sframe(struct unwind_user_state *state) +{ + struct unwind_user_frame frame; + + /* sframe expects the frame to be local storage */ + if (sframe_find(state->ip, &frame)) + return -ENOENT; + return unwind_user_next_common(state, &frame); +} + static int unwind_user_next(struct unwind_user_state *state) { unsigned long iter_mask = state->available_types; @@ -95,6 +106,16 @@ static int unwind_user_next(struct unwind_user_state *state) state->current_type = type; switch (type) { + case UNWIND_USER_TYPE_SFRAME: + switch (unwind_user_next_sframe(state)) { + case 0: + return 0; + case -ENOENT: + continue; /* Try next method. */ + default: + state->done = true; + } + break; case UNWIND_USER_TYPE_FP: if (!unwind_user_next_fp(state)) return 0; @@ -123,6 +144,8 @@ static int unwind_user_start(struct unwind_user_state *state) return -EINVAL; } + if (current_has_sframe()) + state->available_types |= UNWIND_USER_TYPE_SFRAME; if (IS_ENABLED(CONFIG_HAVE_UNWIND_USER_FP)) state->available_types |= UNWIND_USER_TYPE_FP; -- 2.51.0