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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch Subject: [RFC PATCH v2 06/15] s390/vdso: Keep function symbols in vDSO Date: Fri, 5 Dec 2025 18:14:37 +0100 Message-ID: <20251205171446.2814872-7-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251205171446.2814872-1-jremus@linux.ibm.com> References: <20251205171446.2814872-1-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: rbC8D40I834cE8LCNvIl0TcXcM7u1qgW X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI5MDAxNiBTYWx0ZWRfX0JrIZUXQ+e1a TKYGVFY0yJzn+ZFIGLPnP5Gn5xRL0qOjVfoOi56Z011d5yekavFTVfOTR9jvFIQFp1mFl36zvIK jokT8uhkE5eTU7/JYrpL2YTYJKZ5DMhzkNgy5yIuzbP13GtXeRuialGj1IDUE3kTlr9HVSxLkmt 6aJovOwQ9FuLES4glfBTA8B2yABUUSZ8ltgtEvN7vwESszi+rHSh/PFDFOwZSeePeE1GPNJo659 bLXWEC9rVATDaGurhCmqj9e1/5wkuvBHmAFs1AHv5d48TRrUEf8s8dNsqA9+7Vqp/F5Mn8knn2b tgYjl+mDle6aV+9daJBR7W+Fqczz5A4412g4TPs+qlegiLUg2TZ5tSuSiOJp8ZT2feh1pvnP1a7 ZtNRO0w9KetX8/grQkj74mjdeCVmow== X-Authority-Analysis: v=2.4 cv=UO7Q3Sfy c=1 sm=1 tr=0 ts=69331310 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=VnNF1IyMAAAA:8 a=BBANP_1BnTx_iyBG_wsA:9 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-GUID: -pY_xVkp3jvLOrp7z4Vh2HR3elIvWtnH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-05_06,2025-12-04_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 adultscore=0 priorityscore=1501 impostorscore=0 spamscore=0 phishscore=0 clxscore=1015 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511290016 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/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 d8f0df742809..8e78dc3ba025 100644 --- a/arch/s390/kernel/vdso64/Makefile +++ b/arch/s390/kernel/vdso64/Makefile @@ -53,7 +53,7 @@ $(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 -g $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy) =20 --=20 2.51.0