Remove kernel version check

The kernel version check is used to avoid glibc to run on older
kernels where some syscall are not available and fallback code are
not enabled to handle graciously fail.  However, it does not prevent
if the kernel does not correctly advertise its version through
vDSO note, uname or procfs.

Also kernel version checks are sometime not desirable by users,
where they want to deploy on different system with different kernel
version knowing the minimum set of syscall is always presented on
such systems.

The kernel version check has been removed along with the
LD_ASSUME_KERNEL environment variable.  The minimum kernel used to
built glibc is still provided through NT_GNU_ABI_TAG ELF note and
also printed when libc.so is issued.

Checked on x86_64-linux-gnu.

1 files changed, 0 insertions, 6 deletions

diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 5d0369358d..9ae450414e 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -552,8 +552,6 @@ struct rtld_global_ro
 /* These two are used only internally.  */
 #define DL_DEBUG_HELP       (1 << 10)
 
-  /* OS version.  */
-  EXTERN unsigned int _dl_osversion;
   /* Platform name.  */
   EXTERN const char *_dl_platform;
   EXTERN size_t _dl_platformlen;
@@ -701,10 +699,6 @@ struct rtld_global_ro
      dlopen.  */
   int (*_dl_find_object) (void *, struct dl_find_object *);
 
-#ifdef HAVE_DL_DISCOVER_OSVERSION
-  int (*_dl_discover_osversion) (void);
-#endif
-
   /* Dynamic linker operations used after static dlopen.  */
   const struct dlfcn_hook *_dl_dlfcn_hook;