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Date: Thu, 23 Feb 2023 20:49:02 +0700
From: Ammar Faizi <ammarfaizi2@gnuweeb.org>
To: kernel test robot <lkp@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>, llvm@lists.linux.dev,
	oe-kbuild-all@lists.linux.dev,
	GNU/Weeb Mailing List <gwml@vger.gnuweeb.org>,
	Sasha Levin <sashal@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [ammarfaizi2-block:stable/linux-stable-rc/queue/5.4 15/15]
 kernel/bpf/core.c:1570:3: error: implicit declaration of function
 'barrier_nospec'
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References: <202302232136.AWzwjCvb-lkp@intel.com>
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On Thu, Feb 23, 2023 at 09:31:08PM +0800, kernel test robot wrote:
> tree:   https://github.com/ammarfaizi2/linux-block stable/linux-stable-rc/queue/5.4
> commit: 3bb990ea37595b41a1f06a551e5dd35372ea404a [15/15] uaccess: Add speculation barrier to copy_from_user()
...
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202302232136.AWzwjCvb-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> >> kernel/bpf/core.c:1570:3: error: implicit declaration of function 'barrier_nospec' [-Werror,-Wimplicit-function-declaration]
>                    barrier_nospec();
>                    ^
>    1 error generated.

It's missing #include <linux/nospec.h>. The fix for this is:

Upstream f3dd0c53370e70c0f9b7e931bbec12916f3bb8cc ("bpf: add missing header file include")

That one needs to get backported too. Or just fold that in to maintain
the bisectability (for stable kernels).

Thanks,

-- 
Ammar Faizi