* [patch] i386: more vsyscall documentation
@ 2006-02-25 8:02 Chuck Ebbert
0 siblings, 0 replies; only message in thread
From: Chuck Ebbert @ 2006-02-25 8:02 UTC (permalink / raw)
To: Andrew Morton; +Cc: Albert Cahalan, linux-kernel, Linus Torvalds
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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