[Xenomai-core] [PATCH] fix swsusp for gatekeeper thread

[Xenomai-core] [PATCH] fix swsusp for gatekeeper thread

[Jan Kiszka]

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Hi,

this is a convenience patch for people like me running Xenomai on their workstation or notebook. It fixes a crash that occurs on suspend to disk/ram via swsusp because the gatekeeper is woken up by the suspension code but has nothing to migrate then.

With this patch applied, you can now suspend your machine as long as no skin is loaded, i.e. the nucleus is passive. When skins are loaded, the system hangs on resume, maybe due to wrong hardware re-initialisation.

Jan


 include/asm-generic/wrappers.h |    3 +++
 ksrc/nucleus/shadow.c          |    2 ++
 2 files changed, 5 insertions(+)

Index: include/asm-generic/wrappers.h
===================================================================
--- include/asm-generic/wrappers.h      (Revision 1281)
+++ include/asm-generic/wrappers.h      (Arbeitskopie)
@@ -161,6 +161,9 @@ struct task_struct;
 void show_stack(struct task_struct *task,
                unsigned long *sp);

+/* Process suspension */
+#define PF_NOFREEZE 0
+
 #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) */

 /* VM */
Index: ksrc/nucleus/shadow.c
===================================================================
--- ksrc/nucleus/shadow.c       (Revision 1281)
+++ ksrc/nucleus/shadow.c       (Arbeitskopie)
@@ -53,6 +53,7 @@
 #include <nucleus/ppd.h>
 #include <nucleus/trace.h>
 #include <asm/xenomai/features.h>
+#include <asm/xenomai/wrappers.h>

 int nkthrptd;

@@ -2023,6 +2024,7 @@ int xnshadow_mount(void)
                gk->server =
                    kthread_create(&gatekeeper_thread, gk, "gatekeeper/%d",
                                   cpu);
+               gk->server->flags |= PF_NOFREEZE;
                wake_up_process(gk->server);
                down(&gk->sync);
        }




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Re: [Xenomai-core] [PATCH] fix swsusp for gatekeeper thread

[Philippe Gerum]

On Wed, 2006-07-05 at 09:20 +0200, Jan Kiszka wrote:
> Hi,
> 
> this is a convenience patch for people like me running Xenomai on their workstation or notebook. It fixes a crash that occurs on suspend to disk/ram via swsusp because the gatekeeper is woken up by the suspension code but has nothing to migrate then.
> 
> With this patch applied, you can now suspend your machine as long as no skin is loaded, i.e. the nucleus is passive. When skins are loaded, the system hangs on resume, maybe due to wrong hardware re-initialisation.
> 

Merged, thanks.

-- 
Philippe.