[PATCH v2 19/19] DO NOT MERGE
From: Ard Biesheuvel <hidden>
Date: 2017-12-04 12:27:55
Also in:
linux-arm-kernel, linux-rt-users
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
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 917b026d3e00..dfee20246592 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h@@ -549,6 +549,7 @@ alternative_else_nop_endif cmp w1, #1 // == PREEMPT_OFFSET csel x0, x0, xzr, eq tbnz x0, #TIF_NEED_RESCHED, 5555f // needs rescheduling? + b 5555f 4444: #endif .subsection 1
@@ -558,6 +559,38 @@ alternative_else_nop_endif .macro yield_neon_post, lbl:req 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 b \lbl .previous .endm
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2.11.0