Test code to force a kernel_neon_end+begin sequence at every yield point,
and wipe the entire NEON state before resuming the algorithm.
---
arch/arm64/include/asm/assembler.h | 33 ++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/arch/arm64/include/asm/assembler.h
b/arch/arm64/include/asm/assembler.h
index c54e408fd5a7..7072c29b4e83 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -607,6 +607,7 @@ alternative_else_nop_endif
cmp w1, #1 // == PREEMPT_OFFSET
csel x0, x0, xzr, eq
tbnz x0, #TIF_NEED_RESCHED, 5555f // needs rescheduling?
+ b 5555f
#endif
.subsection 1
5555:
@@ -615,6 +616,38 @@ alternative_else_nop_endif
.macro do_cond_yield_neon
bl kernel_neon_end
bl kernel_neon_begin
+ movi v0.16b, #0x55
+ movi v1.16b, #0x55
+ movi v2.16b, #0x55
+ movi v3.16b, #0x55
+ movi v4.16b, #0x55
+ movi v5.16b, #0x55
+ movi v6.16b, #0x55
+ movi v7.16b, #0x55
+ movi v8.16b, #0x55
+ movi v9.16b, #0x55
+ movi v10.16b, #0x55
+ movi v11.16b, #0x55
+ movi v12.16b, #0x55
+ movi v13.16b, #0x55
+ movi v14.16b, #0x55
+ movi v15.16b, #0x55
+ movi v16.16b, #0x55
+ movi v17.16b, #0x55
+ movi v18.16b, #0x55
+ movi v19.16b, #0x55
+ movi v20.16b, #0x55
+ movi v21.16b, #0x55
+ movi v22.16b, #0x55
+ movi v23.16b, #0x55
+ movi v24.16b, #0x55
+ movi v25.16b, #0x55
+ movi v26.16b, #0x55
+ movi v27.16b, #0x55
+ movi v28.16b, #0x55
+ movi v29.16b, #0x55
+ movi v30.16b, #0x55
+ movi v31.16b, #0x55
.endm
.macro endif_yield_neon, lbl=6666f
--
2.11.0
