Date: Sat, 25 Feb 2006 03:02:42 -0500
From: Chuck Ebbert <76306.1226@CompuServe.com>
Subject: [patch] i386: more vsyscall documentation
To: Andrew Morton <akpm@osdl.org>
Cc: Albert Cahalan <acahalan@gmail.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@osdl.org>
Message-ID: <200602250306_MC3-1-B93A-6757@compuserve.com>
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Document a limitation of vsyscall-sysenter, since patches to fix it
have been rejected.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>

--- 2.6.16-rc4-64.orig/arch/i386/kernel/vsyscall-sysenter.S
+++ 2.6.16-rc4-64/arch/i386/kernel/vsyscall-sysenter.S
@@ -21,6 +21,9 @@
  * instruction clobbers %esp, the user's %esp won't even survive entry
  * into the kernel. We store %esp in %ebp. Code in entry.S must fetch
  * arg6 from the stack.
+ *
+ * You can not use this vsyscall for the clone() syscall because the
+ * three dwords on the parent stack do not get copied to the child.
  */
 	.text
 	.globl __kernel_vsyscall
-- 
Chuck
"Equations are the Devil's sentences."  --Stephen Colbert
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