[patch 36/56] openmosix/openmosix-allow-migration-on-syscall-careful-return.patch

[patch 36/56] 
openmosix/openmosix-allow-migration-on-syscall-careful-return.patch 
sysret_carefull hook

This patch allow a process to migrate on the return of a syscall
since for now openmosix is hijacking the TIF_NEEDRESCHED for it's
own purpose, the call to openmosix_pre_usermode must be called
before any schedule() call (since schedule() would clear the
TIF_NEEDRESCHED flag ... )

This patch is already present on tab's git repository (thanks tab)

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[patch @num@/@total@] @name@ sysret_carefull hook

This patch allow a process to migrate on the return of a syscall
since for now openmosix is hijacking the TIF_NEEDRESCHED for it's
own purpose, the call to openmosix_pre_usermode must be called
before any schedule() call (since schedule() would clear the
TIF_NEEDRESCHED flag ... )

This patch is already present on tab's git repository (thanks tab)

Index: linux/arch/x86_64/kernel/entry.S
===================================================================
--- linux.orig/arch/x86_64/kernel/entry.S	2006-11-02 22:52:21.000000000 +0100
+++ linux/arch/x86_64/kernel/entry.S	2006-11-02 22:52:28.000000000 +0100
@@ -270,6 +270,13 @@
 	call schedule
 	popq  %rdi
 	CFI_ADJUST_CFA_OFFSET -8
+#ifdef CONFIG_OPENMOSIX
+	cli
+	SAVE_REST
+	call openmosix_pre_usermode
+	RESTORE_REST
+#endif /* CONFIG_OPENMOSIX */
+
 	jmp sysret_check
 
 	/* Handle a signal */