From: Frank Ch. Eigler <fche@redhat.com>
Date: Mon, 1 Nov 2021 14:08:13 +0000 (-0400)
Subject: runtime: port to kernel 5.15-rc
X-Git-Tag: release-4.6~19
X-Git-Url: https://sourceware.org/git/?a=commitdiff_plain;h=a0ecbdf1fce79af43626074f46cbd8479f40a39c;p=systemtap.git

runtime: port to kernel 5.15-rc

get_mm_exe_file got unexported.  Deal with it the usual way.
---

diff --git a/buildrun.cxx b/buildrun.cxx
index 086ecca61..2a18fe3b7 100644
--- a/buildrun.cxx
+++ b/buildrun.cxx
@@ -370,7 +370,7 @@ compile_pass (systemtap_session& s)
   output_exportconf(s, o2, "synchronize_sched", "STAPCONF_SYNCHRONIZE_SCHED");
   output_autoconf(s, o, cs, "autoconf-task-uid.c", "STAPCONF_TASK_UID", NULL);
   output_autoconf(s, o, cs, "autoconf-from_kuid_munged.c", "STAPCONF_FROM_KUID_MUNGED", NULL);
-  output_exportconf(s, o2, "get_mm_exe_file", "STAPCONF_GET_MM_EXE_FILE");
+  output_exportconf(s, o2, "get_mm_exe_file", "STAPCONF_GET_MM_EXE_FILE_EXPORTED");
   output_dual_exportconf(s, o2, "alloc_vm_area", "free_vm_area", "STAPCONF_VM_AREA");
   output_autoconf(s, o, cs, "autoconf-procfs-owner.c", "STAPCONF_PROCFS_OWNER", NULL);
   output_autoconf(s, o, cs, "autoconf-alloc-percpu-align.c", "STAPCONF_ALLOC_PERCPU_ALIGN", NULL);
diff --git a/runtime/linux/runtime.h b/runtime/linux/runtime.h
index 880c1fa4a..77291f092 100644
--- a/runtime/linux/runtime.h
+++ b/runtime/linux/runtime.h
@@ -255,6 +255,9 @@ static void *kallsyms_signal_wake_up;
 #if !defined(STAPCONF___LOCK_TASK_SIGHAND_EXPORTED)
 static void *kallsyms___lock_task_sighand;
 #endif
+#if !defined(STAPCONF_GET_MM_EXE_FILE_EXPORTED)
+static void *kallsyms_get_mm_exe_file;
+#endif
 
 #include "access_process_vm.h"
 #include "loc2c-runtime.h"
diff --git a/runtime/task_finder_vma.c b/runtime/task_finder_vma.c
index 81a96c7cf..134df8c50 100644
--- a/runtime/task_finder_vma.c
+++ b/runtime/task_finder_vma.c
@@ -420,8 +420,14 @@ stap_find_exe_file(struct mm_struct* mm)
 	// still use our own code. The original get_mm_exe_file() can
 	// sleep (since it calls down_read()), so we'll have to roll
 	// our own.
-#if defined(STAPCONF_DPATH_PATH) && (LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0))
+#if defined(STAPCONF_GET_MM_EXE_FILE_EXPORTED) && (LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0))
 	return get_mm_exe_file(mm);
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0))
+        typedef typeof(&get_mm_exe_file) get_mm_exe_file_fn;
+        if (kallsyms_get_mm_exe_file == NULL)
+          return NULL; /* can't happen; _stp_handle_start would abort before this point */
+        else
+          return (* (get_mm_exe_file_fn) kallsyms_get_mm_exe_file)(mm);
 #else
 	struct file *exe_file = NULL;
 
diff --git a/runtime/transport/transport.c b/runtime/transport/transport.c
index 9b9d6cbe2..3e128c92c 100644
--- a/runtime/transport/transport.c
+++ b/runtime/transport/transport.c
@@ -363,6 +363,13 @@ static int _stp_handle_kallsyms_lookups(void)
                 goto err0;
         }
 #endif
+#if !defined(STAPCONF_GET_MM_EXE_FILE_EXPORTED) && (LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0))
+        kallsyms_get_mm_exe_file = (void*) kallsyms_lookup_name ("get_mm_exe_file");
+        if (kallsyms_get_mm_exe_file == NULL) {
+                _stp_error("Can't resolve get_mm_exe_file!");
+                goto err0;
+        }
+#endif
 #endif
 #if defined(CONFIG_KALLSYMS) && !defined(STAPCONF_KALLSYMS_LOOKUP_NAME_EXPORTED)
         {