[#include <linux/swap.h>],
[lru_cache_add_file(NULL);])
+dnl Linux 4.6 introduced in_compat_syscall as replacement for is_compat_task
+dnl for certain platforms.
+AC_CHECK_LINUX_FUNC([in_compat_syscall],
+ [#include <linux/compat.h>],
+ [in_compat_syscall();])
+
dnl lru_cache_add exported in Linux 5.8
dnl replaces lru_cache_add_file
AC_CHECK_LINUX_FUNC([lru_cache_add],