{"id":2223811,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2223811/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260416091657.578429-2-tshah@linux.ibm.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.1/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/"},"msgid":"<20260416091657.578429-2-tshah@linux.ibm.com>","date":"2026-04-16T09:16:58","name":"[v2] perf dso: Fix kallsyms DSO detection with fallback logic","commit_ref":null,"pull_url":null,"state":"handled-elsewhere","archived":false,"hash":"14563f09a7b35f261d36ca98356b38cf31be5f28","submitter":{"id":93113,"url":"http://patchwork.ozlabs.org/api/1.1/people/93113/?format=json","name":"Tanushree Shah","email":"tshah@linux.ibm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260416091657.578429-2-tshah@linux.ibm.com/mbox/","series":[{"id":500119,"url":"http://patchwork.ozlabs.org/api/1.1/series/500119/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=500119","date":"2026-04-16T09:16:58","name":"[v2] perf dso: Fix kallsyms DSO detection with fallback logic","version":2,"mbox":"http://patchwork.ozlabs.org/series/500119/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2223811/comments/","check":"success","checks":"http://patchwork.ozlabs.org/api/patches/2223811/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=iP5+PhAh;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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The current check then fails to identify it as kallsyms,\ncausing build-id symlinks to not be created in ~/.debug/.build-id/ and\nperf archive to fail with \"Cannot stat\" errors.\n\nSteps to reproduce the issue:\n1. rm -rf ~/.debug/.build-id\n2. perf record sleep 1\n3. perf archive\n\nFix by falling back to matching long_name against the known kallsyms\nstrings explicitly when binary_type is not yet set\n(== DSO_BINARY_TYPE__NOT_FOUND).\n\nFixes: ebf0b332732d (\"perf dso: fix dso__is_kallsyms() check\")\nSigned-off-by: Tanushree Shah \n---\nv1 -> v2: Rename DSO__NAME_GUEST_KALLSYMS to DSO__PREFIX_GUEST_KALLSYMS\n to reflect that it is a prefix, not a full name.\n\nv1: https://lore.kernel.org/all/20260410071225.708005-2-tshah@linux.ibm.com/\n\n tools/perf/util/dso.h | 10 ++++++++++\n 1 file changed, 10 insertions(+)","diff":"diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h\nindex ede691e9a249..515ab6e95b0e 100644\n--- a/tools/perf/util/dso.h\n+++ b/tools/perf/util/dso.h\n@@ -9,6 +9,7 @@\n #include \n #include \n #include \n+#include \n #include \"build-id.h\"\n #include \"debuginfo.h\"\n #include \"mutex.h\"\n@@ -20,6 +21,7 @@ struct perf_env;\n \n #define DSO__NAME_KALLSYMS\t\"[kernel.kallsyms]\"\n #define DSO__NAME_KCORE\t\t\"[kernel.kcore]\"\n+#define DSO__PREFIX_GUEST_KALLSYMS\t\"[guest.kernel.kallsyms\"\n \n /**\n * enum dso_binary_type - The kind of DSO generally associated with a memory\n@@ -915,6 +917,14 @@ static inline bool dso__is_kallsyms(const struct dso *dso)\n {\n \tenum dso_binary_type bt = dso__binary_type(dso);\n \n+\tif (bt == DSO_BINARY_TYPE__NOT_FOUND) {\n+\t\treturn RC_CHK_ACCESS(dso)->kernel &&\n+\t\t\t((strncmp(RC_CHK_ACCESS(dso)->long_name, DSO__NAME_KALLSYMS,\n+\t\t\t\tstrlen(DSO__NAME_KALLSYMS)) == 0) ||\n+\t\t\t(strncmp(RC_CHK_ACCESS(dso)->long_name, DSO__PREFIX_GUEST_KALLSYMS,\n+\t\t\t\tstrlen(DSO__PREFIX_GUEST_KALLSYMS)) == 0));\n+\t}\n+\n \treturn bt == DSO_BINARY_TYPE__KALLSYMS || bt == DSO_BINARY_TYPE__GUEST_KALLSYMS;\n }\n \n","prefixes":["v2"]}