linux-kernel - Re: [PATCH 1/2] [stable-4.9] x86: fix build without CONFIG_X86_VSYSCALL

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Date:   Thu, 15 Feb 2018 17:49:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     stable@...r.kernel.org, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] [stable-4.9] x86: fix build without
 CONFIG_X86_VSYSCALL_EMULATION

On Thu, Feb 15, 2018 at 04:16:56PM +0100, Arnd Bergmann wrote:
> I ran into a 4.9 build regression in randconfig testing, starting with the
> KAISER patches:
> 
> arch/x86/mm/kaiser.c: In function 'kaiser_init':
> arch/x86/mm/kaiser.c:347:8: error: 'vsyscall_pgprot' undeclared (first use in this function); did you mean 'massage_pgprot'?
> 
> This is easy enough to fix, we just need to make the declaration visible
> outside of the #ifdef. This works because the code using it is optimized
> away when vsyscall_enabled() returns false at compile time.
> 
> Fixes: 9a0be5afbfbb ("vsyscall: Fix permissions for emulate mode with KAISER/PTI")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/x86/include/asm/vsyscall.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Thanks for these, I'll queue them up in the next round after these
kernels get released in a few days.

greg k-h