linux-kernel - [PATCH] x86/fpu/xstate: Export fpu_fpregs_owner

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Date:   Fri,  6 Dec 2019 15:17:09 -0800
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Rik van Riel <riel@...riel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: [PATCH] x86/fpu/xstate: Export fpu_fpregs_owner_ctx

After applying my "Invalidate fpregs when __fpu_restore_sig() fails"
patch [1], the following happens:

    ERROR: "fpu_fpregs_owner_ctx" [arch/x86/kvm/kvm.ko] undefined!

Fix it by exporting the symbol.  I apologize for missing this!

[1] https://lkml.kernel.org/r/20191205182648.32257-4-yu-cheng.yu@intel.com/

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
---
 arch/x86/kernel/fpu/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 743ff5ea4076..4e5151e43a2c 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -42,6 +42,7 @@ static DEFINE_PER_CPU(bool, in_kernel_fpu);
  * Track which context is using the FPU on the CPU:
  */
 DEFINE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);
+EXPORT_SYMBOL_GPL(fpu_fpregs_owner_ctx);
 
 static bool kernel_fpu_disabled(void)
 {
-- 
2.17.1