linux-kernel - [PATCH v2] arm64: Fix task tracing

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Message-Id: <1365510814-21343-1-git-send-email-cov@codeaurora.org>
Date:	Tue,  9 Apr 2013 08:33:34 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	Christopher Covington <cov@...eaurora.org>
Subject: [PATCH v2] arm64: Fix task tracing

For accurate accounting pass contextidr_thread_switch the prev
task pointer, since cpu_switch_to has at that point changed the
the stack pointer.

Signed-off-by: Christopher Covington <cov@...eaurora.org>
---
 arch/arm64/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 0337cdb..a49b25a 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -315,7 +315,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
 	/* the actual thread switch */
 	last = cpu_switch_to(prev, next);
 
-	contextidr_thread_switch(next);
+	contextidr_thread_switch(prev);
 	return last;
 }
 
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