diff --git a/config/kernel-totalram-pages-func.m4 b/config/kernel-totalram-pages-func.m4
new file mode 100644
index 0000000000..a6eac64543
--- /dev/null
+++ b/config/kernel-totalram-pages-func.m4
@@ -0,0 +1,18 @@
+dnl #
+dnl # Linux 5.0: totalram_pages is no longer a global variable, and must be
+dnl # read via the totalram_pages() helper function.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_TOTALRAM_PAGES_FUNC], [
+	AC_MSG_CHECKING([whether totalram_pages() exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/mm.h>
+	],[
+		unsigned long pages __attribute__ ((unused));
+		pages = totalram_pages();
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_TOTALRAM_PAGES_FUNC, 1, [kernel has totalram_pages()])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
diff --git a/config/kernel.m4 b/config/kernel.m4
index ea04d85b6c..e4d0e3393b 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -163,6 +163,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_USERNS_CAPABILITIES
 	ZFS_AC_KERNEL_IN_COMPAT_SYSCALL
 	ZFS_AC_KERNEL_KTIME_GET_COARSE_REAL_TS64
+	ZFS_AC_KERNEL_TOTALRAM_PAGES_FUNC
 
 	AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
 		KERNEL_MAKE="$KERNEL_MAKE O=$LINUX_OBJ"
diff --git a/include/spl/sys/vmsystm.h b/include/spl/sys/vmsystm.h
index 2b48fe0e36..6bdfc852ac 100644
--- a/include/spl/sys/vmsystm.h
+++ b/include/spl/sys/vmsystm.h
@@ -33,8 +33,14 @@
 #include <sys/types.h>
 #include <asm/uaccess.h>
 
+#ifdef HAVE_TOTALRAM_PAGES_FUNC
+#define	zfs_totalram_pages	totalram_pages()
+#else
+#define	zfs_totalram_pages	totalram_pages
+#endif
+
 #define	membar_producer()		smp_wmb()
-#define	physmem				totalram_pages
+#define	physmem				zfs_totalram_pages
 #define	freemem			(nr_free_pages() + \
 				global_page_state(NR_INACTIVE_FILE) + \
 				global_page_state(NR_INACTIVE_ANON) + \
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 7e09633345..f5d94cbf90 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -4821,9 +4821,9 @@ arc_all_memory(void)
 {
 #ifdef _KERNEL
 #ifdef CONFIG_HIGHMEM
-	return (ptob(totalram_pages - totalhigh_pages));
+	return (ptob(zfs_totalram_pages - totalhigh_pages));
 #else
-	return (ptob(totalram_pages));
+	return (ptob(zfs_totalram_pages));
 #endif /* CONFIG_HIGHMEM */
 #else
 	return (ptob(physmem) / 2);