MIPS: Malta: Select 32bit DMA zone for 64-bit kernels

Enable the 32-bit DMA zone for 64-bit Malta kernels so that devices with
32-bit coherent DMA masks aren't constrained to the low 16MB DMA zone,
which can easily be exhausted when there is lots of static kernel data
due to lock and RCU debugging.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9890/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 2424ddc43a77..0ee59e8cdb57 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -440,6 +440,7 @@ config MIPS_MALTA
         select SYS_SUPPORTS_MULTITHREADING
         select SYS_SUPPORTS_SMARTMIPS
         select SYS_SUPPORTS_ZBOOT
+        select ZONE_DMA32 if 64BIT
         help
           This enables support for the MIPS Technologies Malta evaluation
           board.