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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Jens Axboe , Florian Weimer , Sam James Subject: [RFC PATCH v1 05/16] s390/vdso: Keep function symbols in vDSO Date: Thu, 10 Jul 2025 18:35:11 +0200 Message-ID: <20250710163522.3195293-6-jremus@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250710163522.3195293-1-jremus@linux.ibm.com> References: <20250710163522.3195293-1-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-ORIG-GUID: w_vmXR7S9YdXTkDzv2pYjcLu7v7plaOd X-Authority-Analysis: v=2.4 cv=MLRgmNZl c=1 sm=1 tr=0 ts=686febd2 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=Wb1JkmetP80A:10 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=VnNF1IyMAAAA:8 a=Y8jfv7Xf8eAsT8039CcA:9 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-GUID: w_vmXR7S9YdXTkDzv2pYjcLu7v7plaOd X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzEwMDEzOSBTYWx0ZWRfXxOKx7UHyHkId T4tAryGvOwhw/TbQwCgUNBSao0VwPmRjlSThv6EtRG7tQUtm0y94rqNGfehfXWsvcQ4lRUiLU/O z9oxjr2OxFaR7L/Ld5bmITYcCHLzpmH6NNgriERz+bnSfy+bL8EYAq1EWKYqMHdrKczgeOcwFYr 0I31Yp+885CtihhhhMwtwoB0whdwRFBTJ2MlAgcDLZl3QdVzY57CbibUsivHZuEafQY3f0nqk7L +qStTMVRwV2ylbBgg7fiCRRjhkSTE3c4vsBpIHdINt2QwSM4l3w3LYOpCeeZlzoemilz8iGehUT 8ep+Zp9/m/W37up6t+akUqAjII4wwaA40UQ8nQPSumSt6ceYysuQVYzw100/H2OcCGrauhrqPQl /dVwy3JNVUwdGSsRblMpvPWTjV2TkEL4VsJkK924ZHRERNhRg6AueSC0ogpvzb1jantl0c2T X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-10_04,2025-07-09_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 suspectscore=0 adultscore=0 priorityscore=1501 mlxscore=0 clxscore=1015 impostorscore=0 malwarescore=0 mlxlogscore=862 lowpriorityscore=0 phishscore=0 spamscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507100139 Content-Type: text/plain; charset="utf-8" Keep all function symbols in the vDSO .symtab for stack trace purposes. This enables perf to lookup these function symbols in addition to those already exported in vDSO .dynsym. Signed-off-by: Jens Remus --- Notes (jremus): Alternatively use objcopy option -g instead of -S (and the -w -K filters), as Josh did in "x86/vdso: Enable sframe generation in VDSO": https://lore.kernel.org/all/20250425024023.173709192@goodmis.org/ =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 script may use a stale copy without .symtab. Resolve by deleting ~/.debug/. arch/s390/kernel/vdso64/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Mak= efile index e96156b9c4df..067753352697 100644 --- a/arch/s390/kernel/vdso64/Makefile +++ b/arch/s390/kernel/vdso64/Makefile @@ -58,7 +58,7 @@ $(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) $(o= bj-cvdso64) FORCE $(call if_changed,vdso_and_check) =20 # strip rule for the .so file -$(obj)/%.so: OBJCOPYFLAGS :=3D -S +$(obj)/%.so: OBJCOPYFLAGS :=3D -S -w -K "__arch_*" -K "__cvdso_*" -K "__s3= 90_vdso_*" $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy) =20 --=20 2.48.1