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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch , Borislav Petkov , Dave Hansen , David Hildenbrand , "H. Peter Anvin" , "Liam R. Howlett" , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Heiko Carstens , Vasily Gorbik , "Steven Rostedt (Google)" Subject: [PATCH v13 06/18] unwind_user/sframe: Wire up unwind_user to sframe Date: Tue, 27 Jan 2026 16:05:41 +0100 Message-ID: <20260127150554.2760964-7-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260127150554.2760964-1-jremus@linux.ibm.com> References: <20260127150554.2760964-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: _vLn3dmPI5jstfJPr09Re077zRhGt_j9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyMSBTYWx0ZWRfX+tZzNgx3Girk Q34EgBlH4RYHuj+XZucDOKvQxGt4E0LCZryiltuHy6cdxj3HbbjhLtaM+MLF6hiiSrC53ON2nzu 0LALSK+Sb2K3hhHMluJZWm7NJGlcYK3ZZ+zGGTy60ARHu8sjrds8wPq5S8GDayOGjTfYVPo5YYI UBdgqOkMj+3ySFviF9UqmzIeJWA6C3hrZwvtvhxNWW9dMjIbW/BAcemAzGSfJnVpXP2hl71IQ55 Fju4zEWnuyVyCehGPSStd8sEHlZguyyrN5mMR4P3qAYyCqf5Dk0n/R2GaI4EGlS8kZ3z019FBNk +p2ShdClPrTtBIIf2gEn7cGpI+A+m6NBGQmDJregnenEEQSfZrCM6e5TpwJeZxFVvQBHdUUl7/K eJuMKh9W5YzhsJSEgqh+rS5Ug1Zgq40cAJ+ILSihLjdwRlm5JLcil46mM6cAC9Ixe9knCvWqOiK 2y1cTo0isDWxo4h6OMQ== X-Authority-Analysis: v=2.4 cv=Zs3g6t7G c=1 sm=1 tr=0 ts=6978d45d cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=7d_E57ReAAAA:8 a=JfrnYn6hAAAA:8 a=yPCof4ZbAAAA:8 a=mDV3o1hIAAAA:8 a=yMhMjlubAAAA:8 a=VnNF1IyMAAAA:8 a=Z4Rwk6OoAAAA:8 a=20KFwNOVAAAA:8 a=7mOBRU54AAAA:8 a=meVymXHHAAAA:8 a=ZumjT3II3fW-INSmAFwA:9 a=jhqOcbufqs7Y1TYCrUUU:22 a=1CNFftbPRP8L7MoqJWF3:22 a=HkZW87K1Qel5hWWM3VKY:22 a=wa9RWnbW_A1YIeRBVszw:22 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-ORIG-GUID: 93xmvXR5SG-tXz1DxtBs637NzhJoO2U1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-27_03,2026-01-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 adultscore=0 phishscore=0 suspectscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601270121 Content-Type: text/plain; charset="utf-8" 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(). ] Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Jiri Olsa Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: Thomas Gleixner Cc: Andrii Nakryiko Cc: Indu Bhagat Cc: "Jose E. Marchesi" Cc: Beau Belgrave Cc: Jens Remus Cc: Linus Torvalds Cc: Andrew Morton Cc: Florian Weimer Cc: Sam James Cc: Kees Cook Cc: "Carlos O'Donell" Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) 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 7d5517364d8b..2ece3df821b5 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -488,6 +488,7 @@ config HAVE_UNWIND_USER_FP =20 config HAVE_UNWIND_USER_SFRAME bool + select UNWIND_USER =20 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 =3D 0, + UNWIND_USER_TYPE_SFRAME_BIT =3D 0, + UNWIND_USER_TYPE_FP_BIT =3D 1, =20 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 =3D 0, + UNWIND_USER_TYPE_SFRAME =3D BIT(UNWIND_USER_TYPE_SFRAME_BIT), UNWIND_USER_TYPE_FP =3D BIT(UNWIND_USER_TYPE_FP_BIT), }; =20 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 =20 #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); } =20 +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 =3D state->available_types; @@ -95,6 +106,16 @@ static int unwind_user_next(struct unwind_user_state *s= tate) =20 state->current_type =3D 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 =3D 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; } =20 + if (current_has_sframe()) + state->available_types |=3D UNWIND_USER_TYPE_SFRAME; if (IS_ENABLED(CONFIG_HAVE_UNWIND_USER_FP)) state->available_types |=3D UNWIND_USER_TYPE_FP; =20 --=20 2.51.0