linux-kernel - RE: [x86/xsave] WARNING: CPU: 0 PID: 1 at arch/x86/kernel/xsave.c:306 save_xstate

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Date:	Sat, 9 May 2015 15:21:06 +0000
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	"Wu, Fengguang" <fengguang.wu@...el.com>,
	"Hansen, Dave" <dave.hansen@...el.com>
CC:	LKP <lkp@...org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [x86/xsave] WARNING: CPU: 0 PID: 1 at
 arch/x86/kernel/xsave.c:306 save_xstate_sig()

> From: Wu, Fengguang
> Sent: Saturday, May 09, 2015 5:31 AM
> To: Hansen, Dave
> Just in case this information will help: this patch adds one more warning
> message.
> 
> https://github.com/hansendc/linux.git github-mpx
> 
> commit 3701f7533ba43e0aec12bf2dffd49855499fa524
> [    3.058044] WARNING: CPU: 0 PID: 1 at arch/x86/kernel/xsave.c:306
> save_xstate_sig+0x329/0x340()
> [    3.059684] mismatched xstate sizes

The issue has been fixed in https://lkml.org/lkml/2015/5/8/737

The patch in this git tree missed the following part when ported
to this git tree.

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 00918327..8a7b96b 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -166,6 +166,7 @@ static void init_thread_xstate(void)
 		setup_clear_cpu_cap(X86_FEATURE_XSAVE);
 		setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT);
 		xstate_size = sizeof(struct i387_soft_struct);
+		user_xstate_size = xstate_size;
 		return;
 	}
 
@@ -173,6 +174,8 @@ static void init_thread_xstate(void)
 		xstate_size = sizeof(struct i387_fxsave_struct);
 	else
 		xstate_size = sizeof(struct i387_fsave_struct);
+
+	user_xstate_size = xstate_size;
 }
 
 /*

Thanks.

-Fenghua

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