linux-kernel - [PATCH v4 20/20] DO NOT MERGE

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Date:   Tue, 26 Dec 2017 10:29:40 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Mark Rutland <mark.rutland@....com>,
        linux-rt-users@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v4 20/20] DO NOT MERGE

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 575d0f065d28..295937b2f39b 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -622,6 +622,7 @@ alternative_else_nop_endif
 	cmp		w1, #PREEMPT_DISABLE_OFFSET
 	csel		x0, x0, xzr, eq
 	tbnz		x0, #TIF_NEED_RESCHED, .Lyield_\@	// needs rescheduling?
+	b		.Lyield_\@
 #endif
 	/* fall through to endif_yield_neon */
 	.subsection	1
@@ -631,6 +632,38 @@ 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
-- 
2.11.0