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authorLeonid Yegoshin <Leonid.Yegoshin@imgtec.com>2017-06-19 17:50:10 +0200
committerRalf Baechle <ralf@linux-mips.org>2017-06-29 02:42:24 +0200
commit3daf281f2ce3b80cc1abf04f355f066e37f69451 (patch)
tree34807b215de12dc3e6928f2da765ad935dc27f59 /arch/mips/lib
parent21855a6e5b44999fb9f5493cc2c8c9eed5f32876 (diff)
MIPS: R6: Fix PREF instruction usage by memcpy for MIPS R6
Disable usage of PREF instruction usage by memcpy for MIPS R6. MIPS R6 redefines PREF instruction with smaller offset than ordinary MIPS. However, the memcpy code uses PREF instruction with offsets bigger than +-256 bytes. Malta kernels already disable usage of PREF for memcpy. This was found during adaptation of MIPS R6 for virtual board used by Android emulator. Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com> Signed-off-by: Goran Ferenc <goran.ferenc@imgtec.com> Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtech.com> Cc: James.Hogan@imgtec.com Cc: Paul.Burton@imgtec.com Cc: Raghu.Gandham@imgtec.com Cc: Leonid.Yegoshin@imgtec.com Cc: Douglas.Leung@imgtec.com Cc: Petar.Jovanovic@imgtec.com Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/16510/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/lib')
-rw-r--r--arch/mips/lib/memcpy.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/mips/lib/memcpy.S b/arch/mips/lib/memcpy.S
index 3114a2ed1f4e..03e3304d6ae5 100644
--- a/arch/mips/lib/memcpy.S
+++ b/arch/mips/lib/memcpy.S
@@ -28,6 +28,9 @@
#ifdef CONFIG_MIPS_MALTA
#undef CONFIG_CPU_HAS_PREFETCH
#endif
+#ifdef CONFIG_CPU_MIPSR6
+#undef CONFIG_CPU_HAS_PREFETCH
+#endif
#include <asm/asm.h>
#include <asm/asm-offsets.h>