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>>>>> Ulrich Drepper writes:
> tb@MIT.EDU (Thomas Bushnell, BSG) writes:
>> That's fine; I thought you were talking about checking a compile-time
>> constant.
> At compile time you provide configure with the minimal supported
> kernel version and this will be enforced at runtime. With Andreas'
> information we can restrict the use of LDT on kernel 2.3.49 and later
> and enable the feature only if such a kernel is the minimum
> requirement.
Here's a patch to do so. Shall I commit it?
Andreas
For linuxthreads:
2000-05-24 Andreas Jaeger <aj@suse.de>
* sysdeps/i386/i686/pt-machine.h: Only use LDT on newer kernels.
Normal ChangeLog:
2000-05-24 Andreas Jaeger <aj@suse.de>
* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_LDT_WORKS):
Define it for newer kernels.
============================================================
Index: linuxthreads/sysdeps/i386/i686/pt-machine.h
--- linuxthreads/sysdeps/i386/i686/pt-machine.h 2000/04/27 20:16:31 1.10
+++ linuxthreads/sysdeps/i386/i686/pt-machine.h 2000/05/24 06:47:04
@@ -22,8 +22,8 @@
#ifndef PT_EI
# define PT_EI extern inline
#endif
+#include "kernel-features.h"
-
/* Get some notion of the current stack. Need not be exactly the top
of the stack, just something somewhere in the current frame. */
#define CURRENT_STACK_FRAME stack_pointer
@@ -61,6 +61,7 @@
: "memory");
return ret;
}
-
+#if __ASSUME_LDT_WORKS > 0
#include "../useldt.h"
+#endif
============================================================
Index: sysdeps/unix/sysv/linux/kernel-features.h
--- sysdeps/unix/sysv/linux/kernel-features.h 2000/01/27 23:40:47 1.11
+++ sysdeps/unix/sysv/linux/kernel-features.h 2000/05/24 06:47:04
@@ -117,3 +117,14 @@
# define __ASSUME_SETRESUID_SYSCALL 1
# endif
#endif
+
+/* We can use the LDTs for threading with Linux 2.3.99 and newer. */
+#if __LINUX_KERNEL_VERSION >= 131939
+# define __ASSUME_LDT_WORKS 1
+#endif
--
Andreas Jaeger
SuSE Labs aj@suse.de
private aj@arthur.inka.de
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