linux-kernel - [PATCH 2/6] syslet: asm-generic support to disable syslets

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Date:	Thu,  6 Dec 2007 15:20:15 -0800
From:	Zach Brown <zach.brown@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ulrich Drepper <drepper@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dan Williams <dan.j.williams@...il.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Simon Holm Thogersen <odie@...aau.dk>,
	suresh.b.siddha@...el.com
Subject: [PATCH 2/6] syslet: asm-generic support to disable syslets

This provides an implementation of the architecture dependent portion of
syslets which disables syslet operations.

This patch is an incomplete demonstration.  All asm-*/syslet*.h files would
include these files until their architectures provide implementations which
enable syslet support.

Signed-off-by: Zach Brown <zach.brown@...cle.com>

diff --git a/include/asm-generic/syslet-abi.h b/include/asm-generic/syslet-abi.h
new file mode 100644
index 0000000..5d19971
--- /dev/null
+++ b/include/asm-generic/syslet-abi.h
@@ -0,0 +1,11 @@
+#ifndef _ASM_GENERIC_SYSLET_ABI_H
+#define _ASM_GENERIC_SYSLET_ABI_H
+
+/*
+ * I'm assuming that a u64 ip and u64 esp won't be enough for all
+ * archs, so I just let each arch define its own.
+ */
+struct syslet_frame {
+};
+
+#endif
diff --git a/include/asm-generic/syslet.h b/include/asm-generic/syslet.h
new file mode 100644
index 0000000..de9a750
--- /dev/null
+++ b/include/asm-generic/syslet.h
@@ -0,0 +1,34 @@
+#ifndef _ASM_GENERIC_SYSLET_H
+#define _ASM_GENERIC_SYSLET_H
+
+/*
+ * This provider of the arch-specific syslet APIs is used when an architecture
+ * doesn't support syslets.
+ */
+
+/* this stops the other functions from ever being called */
+static inline int syslet_frame_valid(struct syslet_frame *frame)
+{
+	return 0;
+}
+
+static inline void set_user_frame(struct task_struct *task,
+				  struct syslet_frame *frame)
+{
+	BUG();
+}
+
+static inline void move_user_context(struct task_struct *dest,
+					struct task_struct *src)
+{
+	BUG();
+}
+
+static inline int create_syslet_thread(long (*fn)(void *),
+				       void *arg, unsigned long flags)
+{
+	BUG();
+	return 0;
+}
+
+#endif
diff --git a/include/asm-x86/syslet-abi.h b/include/asm-x86/syslet-abi.h
new file mode 100644
index 0000000..14a7182
--- /dev/null
+++ b/include/asm-x86/syslet-abi.h
@@ -0,0 +1 @@
+#include <asm-generic/syslet-abi.h>
diff --git a/include/asm-x86/syslet.h b/include/asm-x86/syslet.h
new file mode 100644
index 0000000..583d810
--- /dev/null
+++ b/include/asm-x86/syslet.h
@@ -0,0 +1 @@
+#include <asm-generic/syslet.h>
-- 
1.5.2.2

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