dtrace: ensure that PID 0 has a psinfo struct

Test builtinvar/tst.psinfo.d lists a large amount of memory access
errors trying to read from non-existant psinfo information for PID 0.
This commit enusres that prior to dtrace doing any work, PID 0 (the
init_task) has a psinfo structure associated with it.

Orabug: 22561297
Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Acked-by: Nick Alcock <nick.alcock@oracle.com>

diff --git a/kernel/dtrace/dtrace_os.c b/kernel/dtrace/dtrace_os.c
index cb07fb10d92f23ea11109b1a8c3f9064db175bee..ff94fd9b442089b5b7f9014d370548ad861ff1be 100644 (file)
--- a/kernel/dtrace/dtrace_os.c
+++ b/kernel/dtrace/dtrace_os.c
@@ -85,6 +85,11 @@ void dtrace_os_init(void)
                                SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK,
                                NULL);
 
+       /*
+        * We need to set up a psinfo structure for PID 0 (swapper).
+        */
+       dtrace_psinfo_alloc(&init_task);
+
        dtrace_sdt_init();
        dtrace_sdt_register(dtrace_kmod);
 }