A couple of MIPS fixes that should have ideally made it for v4.19, but

hey-ho here they are now:
 
   - A fix for potential poor stack placement introduced in v4.19-rc8.
 
   - A fix for a warning introduced in use of TURBOchannel devices by DMA
     changes in v4.16.
 -----BEGIN PGP SIGNATURE-----
 
 iIsEABYIADMWIQRgLjeFAZEXQzy86/s+p5+stXUA3QUCW9JT+BUccGF1bC5idXJ0
 b25AbWlwcy5jb20ACgkQPqefrLV1AN04kAD+J5UyiYrjfp1cdKmO5uHpd/3+eMXy
 K+yt1fLI3u8dkS4A/3gFW+fY9ZWFXHKTtmIFt0cvg6nn1cI9XWAPSxuIl/UO
 =SilC
 -----END PGP SIGNATURE-----

Merge tag 'mips_fixes_4.20_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

Pull MIPS fixes from Paul Burton:
 "A couple of MIPS fixes that should have ideally made it for v4.19, but
  hey-ho here they are now:

   - A fix for potential poor stack placement introduced in v4.19-rc8.

   - A fix for a warning introduced in use of TURBOchannel devices by
     DMA changes in v4.16"

* tag 'mips_fixes_4.20_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  MIPS: VDSO: Reduce VDSO_RANDOMIZE_SIZE to 64MB for 64bit
  TC: Set DMA masks for devices

arch/mips/include/asm/processor.h

@@ -81,7 +81,7 @@ extern unsigned int vced_count, vcei_count;
 
 #endif
 
-#define VDSO_RANDOMIZE_SIZE	(TASK_IS_32BIT_ADDR ? SZ_1M : SZ_256M)
+#define VDSO_RANDOMIZE_SIZE	(TASK_IS_32BIT_ADDR ? SZ_1M : SZ_64M)
 
 extern unsigned long mips_stack_top(void);
 #define STACK_TOP		mips_stack_top()

drivers/tc/tc.c

@@ -2,7 +2,7 @@
  *	TURBOchannel bus services.
  *
  *	Copyright (c) Harald Koerfgen, 1998
- *	Copyright (c) 2001, 2003, 2005, 2006  Maciej W. Rozycki
+ *	Copyright (c) 2001, 2003, 2005, 2006, 2018  Maciej W. Rozycki
  *	Copyright (c) 2005  James Simmons
  *
  *	This file is subject to the terms and conditions of the GNU
@@ -10,6 +10,7 @@
  *	directory of this archive for more details.
  */
 #include <linux/compiler.h>
+#include <linux/dma-mapping.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
@@ -92,6 +93,11 @@ static void __init tc_bus_add_devices(struct tc_bus *tbus)
 		tdev->dev.bus = &tc_bus_type;
 		tdev->slot = slot;
 
+		/* TURBOchannel has 34-bit DMA addressing (16GiB space). */
+		tdev->dma_mask = DMA_BIT_MASK(34);
+		tdev->dev.dma_mask = &tdev->dma_mask;
+		tdev->dev.coherent_dma_mask = DMA_BIT_MASK(34);
+
 		for (i = 0; i < 8; i++) {
 			tdev->firmware[i] =
 				readb(module + offset + TC_FIRM_VER + 4 * i);

include/linux/tc.h

@@ -84,6 +84,7 @@ struct tc_dev {
 					   device. */
 	struct device	dev;		/* Generic device interface. */
 	struct resource	resource;	/* Address space of this device. */
+	u64		dma_mask;	/* DMA addressable range. */
 	char		vendor[9];
 	char		name[9];
 	char		firmware[9];