From: Dmitry Safonov <dsafonov@virtuozzo.com>
To: <linux-kernel@vger.kernel.org>
CC: <luto@amacapital.net>, <tglx@linutronix.de>, <mingo@redhat.com>,
        <hpa@zytor.com>, <x86@kernel.org>, <rric@kernel.org>,
        <oprofile-list@lists.sf.net>, <0x7f454c46@gmail.com>,
        Dmitry Safonov <dsafonov@virtuozzo.com>
Subject: [PATCH 1/4] x86/events: down with test_thread_flag(TIF_IA32)
Date: Thu, 14 Apr 2016 21:10:11 +0300
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We can use user_64bit_mode(regs) here instead of thread flag
because we have full register frame.

Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
---
 arch/x86/events/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 041e442a3e28..91d101a9a6e9 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2269,7 +2269,7 @@ perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry *entry)
 	struct stack_frame_ia32 frame;
 	const void __user *fp;
 
-	if (!test_thread_flag(TIF_IA32))
+	if (user_64bit_mode(regs))
 		return 0;
 
 	cs_base = get_segment_base(regs->cs);
-- 
2.8.0