rhbz#563114 Make syscall.pipe sys32_pipe probe alias optional on x86_64.

Some distributions might have backported the pipe fd leak patch and removed
the sys32_pipe kernel function even before 2.6.32. So make the probe alias
optional instead of relying on a version check.

* tapset/x86_64/syscalls.stp (syscall.pipe): Make alias optional.
  (syscall.pipe.return): Likewise.

1 files changed, 3 insertions, 5 deletions

diff --git a/tapset/x86_64/syscalls.stp b/tapset/x86_64/syscalls.stp
index 79a5181e..5ad064a2 100644
--- a/tapset/x86_64/syscalls.stp
+++ b/tapset/x86_64/syscalls.stp
@@ -145,16 +145,14 @@ probe syscall.vm86_warning.return = kernel.function("sys32_vm86_warning").return
 # pipe _______________________________________________________
 #
 # long sys32_pipe(int __user *fd)
-#
-%(kernel_v < "2.6.32" %?
-probe syscall.pipe32 = kernel.function("sys32_pipe")
+# Not available in newer kernels.
+probe syscall.pipe32 = kernel.function("sys32_pipe")?
 {
 	name = "pipe"
 	argstr = sprintf("%p", $fd)
 }
-probe syscall.pipe32.return = kernel.function("sys32_pipe").return
+probe syscall.pipe32.return = kernel.function("sys32_pipe").return?
 {
 	name = "pipe"
 	retstr = returnstr(1)
 }
-%)