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authorChuck Ebbert <76306.1226@compuserve.com>2006-03-23 05:59:48 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 10:38:06 -0500
commitbe0a39120cb6b88bd085a3a280f5c769a3ed85ad (patch)
tree39a882518d67f22894cdec615db32aad2b070f73
parent635cf99a80f4ebee59d70eb64bb85ce829e4591f (diff)
[PATCH] i386: more vsyscall documentation
Document a limitation of vsyscall-sysenter, since patches to fix it have been rejected. Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/kernel/vsyscall-sysenter.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/i386/kernel/vsyscall-sysenter.S b/arch/i386/kernel/vsyscall-sysenter.S
index 76b728159403..3b62baa6a371 100644
--- a/arch/i386/kernel/vsyscall-sysenter.S
+++ b/arch/i386/kernel/vsyscall-sysenter.S
@@ -21,6 +21,9 @@
21 * instruction clobbers %esp, the user's %esp won't even survive entry 21 * instruction clobbers %esp, the user's %esp won't even survive entry
22 * into the kernel. We store %esp in %ebp. Code in entry.S must fetch 22 * into the kernel. We store %esp in %ebp. Code in entry.S must fetch
23 * arg6 from the stack. 23 * arg6 from the stack.
24 *
25 * You can not use this vsyscall for the clone() syscall because the
26 * three dwords on the parent stack do not get copied to the child.
24 */ 27 */
25 .text 28 .text
26 .globl __kernel_vsyscall 29 .globl __kernel_vsyscall