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>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 2424ddc43a77b6b7b8bd78117f84d320008a80e3..0ee59e8cdb5747d8850a8f2fe9c6d5b81d9d5092 100644 (file)
--- 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.