Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index 3ef1b48..327b728 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -1,12 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
  * James Leu (jleu@mindspring.net).
  * Copyright (C) 2001 by various other people who didn't put their name here.
- * Licensed under the GPL.
  */
 
-#include <linux/bootmem.h>
+#include <linux/memblock.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/inetdevice.h>
@@ -137,8 +137,6 @@
 		schedule_work(&lp->work);
 		goto out;
 	}
-	reactivate_fd(lp->fd, UM_ETH_IRQ);
-
 out:
 	spin_unlock(&lp->lock);
 	return IRQ_HANDLED;
@@ -650,7 +648,10 @@
 		return 1;
 	}
 
-	new = alloc_bootmem(sizeof(*new));
+	new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
+	if (!new)
+		panic("%s: Failed to allocate %zu bytes\n", __func__,
+		      sizeof(*new));
 
 	INIT_LIST_HEAD(&new->list);
 	new->index = n;