linux-kernel - Re: [PATCH stable 3.10, 3.12, 3.14] MIPS: Export FP functions used by lose

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Message-ID: <20150306063034.GA6914@kroah.com>
Date:	Thu, 5 Mar 2015 22:30:34 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	James Hogan <james.hogan@...tec.com>
Cc:	Guenter Roeck <linux@...ck-us.net>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	satoru.takeuchi@...il.com, shuah.kh@...sung.com,
	stable@...r.kernel.org, linux-mips@...ux-mips.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Burton <paul.burton@...tec.com>,
	Gleb Natapov <gleb@...nel.org>, kvm@...r.kernel.org
Subject: Re: [PATCH stable 3.10, 3.12, 3.14] MIPS: Export FP functions used
 by lose_fpu(1) for KVM

On Thu, Mar 05, 2015 at 04:08:44PM +0000, James Hogan wrote:
> [ Upstream commit 3ce465e04bfd8de9956d515d6e9587faac3375dc ]
> 
> Export the _save_fp asm function used by the lose_fpu(1) macro to GPL
> modules so that KVM can make use of it when it is built as a module.
> 
> This fixes the following build error when CONFIG_KVM=m due to commit
> f798217dfd03 ("KVM: MIPS: Don't leak FPU/DSP to guest"):
> 
> ERROR: "_save_fp" [arch/mips/kvm/kvm.ko] undefined!
> 
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> Fixes: f798217dfd03 (KVM: MIPS: Don't leak FPU/DSP to guest)
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Paul Burton <paul.burton@...tec.com>
> Cc: Gleb Natapov <gleb@...nel.org>
> Cc: kvm@...r.kernel.org
> Cc: linux-mips@...ux-mips.org
> Cc: <stable@...r.kernel.org> # 3.10...3.15
> Patchwork: https://patchwork.linux-mips.org/patch/9260/
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
> [james.hogan@...tec.com: Only export when CPU_R4K_FPU=y prior to v3.16,
>  so as not to break the Octeon build which excludes FPU support. KVM
>  depends on MIPS32r2 anyway.]
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> ---
> Appologies for the previous cavium_octeon_defconfig link breakage.
> Octeon has the symbol since 3.16, but not before. This backport should
> do the trick for stable 3.10, 3.12, and 3.14. Build tested with
> cavium_octeon_defconfig and malta_kvm_defconfig on those stable
> branches.
> ---
>  arch/mips/kernel/mips_ksyms.c | 8 ++++++++
>  1 file changed, 8 insertions(+)

Now fixed up, thanks.

greg k-h
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