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From 0dede80d25ae2005f8af7235809fc09a7c47c62e Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@arm.com>
Date: Tue, 11 Dec 2018 19:26:46 +0000
Subject: [PATCH 2/3] arm64/sve: ptrace: Fix SVE_PT_REGS_OFFSET definition

SVE_PT_REGS_OFFSET is supposed to indicate the offset for skipping
over the ptrace NT_ARM_SVE header (struct user_sve_header) to the
start of the SVE register data proper.

However, currently SVE_PT_REGS_OFFSET is defined in terms of struct
sve_context, which is wrong: that structure describes the SVE
header in the signal frame, not in the ptrace regset.

This patch fixes the definition to use the ptrace header structure
struct user_sve_header instead.

By good fortune, the to structures are the same size anyway, so
there is no functional or ABI change.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

Upstream-Status: Submitted [https://www.spinics.net/lists/arm-kernel/msg694800.html]
---
 arch/arm64/include/uapi/asm/ptrace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h
index 98c4ce55d9c3..ad64d2c92ef5 100644
--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h
@@ -130,7 +130,7 @@ struct user_sve_header {
 
 /* Offset from the start of struct user_sve_header to the register data */
 #define SVE_PT_REGS_OFFSET					\
-	((sizeof(struct sve_context) + (SVE_VQ_BYTES - 1))	\
+	((sizeof(struct user_sve_header) + (SVE_VQ_BYTES - 1))	\
 		/ SVE_VQ_BYTES * SVE_VQ_BYTES)
 
 /*
-- 
2.5.0