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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch Subject: [PATCH v4 03/12] s390/vdso: Keep function symbols in vDSO Date: Tue, 27 Jan 2026 16:19:16 +0100 Message-ID: <20260127151926.2805123-4-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260127151926.2805123-1-jremus@linux.ibm.com> References: <20260127151926.2805123-1-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: TOYoFOrvGBo3XdukcZDhpQGLAq2TyU_B X-Authority-Analysis: v=2.4 cv=Uptu9uwB c=1 sm=1 tr=0 ts=6978d78a cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=VnNF1IyMAAAA:8 a=jnAA27LldM3NCp0g0JkA:9 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-ORIG-GUID: 4puAM-DtEJJ45pjh5iMT5mNi_AO2fhtR X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyMSBTYWx0ZWRfX5KKO9kgPsI5c uYa3XNUhw2ynyRt8TgveCWbQXdfcaDKTtkeexwdG+TwTcnOy5tNP12F9nktkVxb+guzFHpxesik rpfO11Vp/ZjnMHVl0vFd39GCeX5sZJUw0eqCDfsmxHSRxDcrUNnnJJs9X6jak3Fr0xH60Y4cqj4 CWjTskvlmDmOAK1V035XdgQ9UU2E5lRVZEUo9WbqKsA5NdfbLaNjMNjh+1u5q3SH6O5Opow6Juk ni5fEwpIanz8KSJ43nrUWb42nQrOwEpnwbw58doPvSvlfXqJHUTdh/QaSzwtyq5MW0bY79Dofan eibkawwNWUORaaStNEiSOWO/MoVUPYf9SjpoCKoXvEghKIFHurGPeS3NOcKDIvaEz9BrFCzVSXf IA93X5MdJiNx51Pae7x9J4O8Br7JJhY7/REoc+E7lMR1nV49hGIWTzC/wyx4owq+XUs9CoOx8su 1a+o2EoHciMdXBJ3VtA== 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 malwarescore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 phishscore=0 adultscore=0 impostorscore=0 bulkscore=0 spamscore=0 suspectscore=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" Keep all function symbols in the vDSO .symtab for stack trace purposes. This enables a stack tracer, such as perf, to lookup these function symbols in addition to those already exported in vDSO .dynsym. Signed-off-by: Jens Remus --- Notes (jremus): Changes in RFC v2: - Use objcopy flag "-g" instead of "-S" with the cumbersome filter "-w -K "__arch_*" -K "__cvdso_*" -K "__s390_vdso_*" to keep the function symbols, as Josh did in "x86/vdso: Enable sframe generation in VDSO": https://lore.kernel.org/all/20250425024023.173709192@goodmis.org/ - Reword commit message. =20 Note that unlike Josh I did not squash this into the subsequent patch "s390/vdso: Enable SFrame generation in vDSO", as this change is unrelated to enabling the use of SFrame. perf report/script do also benefit from this change when using perf record --call-graph dwarf. =20 Note that this change does not cause the vDSO build-id to change. perf record may therefore not dump an updated copy of the vDSO to ~/.debug/[vdso]//vdso, so that perf report/script may use a stale copy without .symtab. Resolve by deleting ~/.debug/. arch/s390/kernel/vdso/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/kernel/vdso/Makefile b/arch/s390/kernel/vdso/Makefile index 2fa12d4ac106..3a8bde5716f4 100644 --- a/arch/s390/kernel/vdso/Makefile +++ b/arch/s390/kernel/vdso/Makefile @@ -50,7 +50,7 @@ $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) $(obj-cvd= so) FORCE $(call if_changed,vdso_and_check) =20 # strip rule for the .so file -$(obj)/%.so: OBJCOPYFLAGS :=3D -S +$(obj)/%.so: OBJCOPYFLAGS :=3D -g $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy) =20 --=20 2.51.0