From: Chuck Ebbert <76306.1226@CompuServe.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Albert Cahalan <acahalan@gmail.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@osdl.org>
Subject: [patch] i386: more vsyscall documentation
Date: Sat, 25 Feb 2006 03:02:42 -0500 [thread overview]
Message-ID: <200602250306_MC3-1-B93A-6757@compuserve.com> (raw)
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
reply other threads:[~2006-02-25 8:14 UTC|newest]
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