linux-kernel - Re: [PATCH v2] jump label: fix passing kbuild_cflags when checking for asm goto support

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Date:   Fri, 10 Mar 2017 10:30:27 -0800
From:   David Lin <dtwlin@...gle.com>
To:     Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Anton V. Boyarshinov" <boyarsh@...linux.org>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] jump label: fix passing kbuild_cflags when checking
 for asm goto support

On Fri, Mar 10, 2017 at 9:55 AM, Gleb Fotengauer-Malinovskiy
<glebfm@...linux.org> wrote:
>
> The latest change of asm goto support check added passing of KBUILD_CFLAGS
> to compiler.  When these flags reference gcc plugins that are not built yet,
> the check fails.
>
> When one runs "make bzImage" followed by "make modules", the kernel is always
> built with HAVE_JUMP_LABEL disabled, while the modules are built depending on
> CONFIG_JUMP_LABEL.  If HAVE_JUMP_LABEL macro happens to be different, modules
> are built with undefined references, e.g.:
>
> ERROR: "static_key_slow_inc" [net/netfilter/xt_TEE.ko] undefined!
> ERROR: "static_key_slow_dec" [net/netfilter/xt_TEE.ko] undefined!
> ERROR: "static_key_slow_dec" [net/netfilter/nft_meta.ko] undefined!
> ERROR: "static_key_slow_inc" [net/netfilter/nft_meta.ko] undefined!
> ERROR: "nf_hooks_needed" [net/netfilter/ipvs/ip_vs.ko] undefined!
> ERROR: "nf_hooks_needed" [net/ipv6/ipv6.ko] undefined!
> ERROR: "static_key_count" [net/ipv6/ipv6.ko] undefined!
> ERROR: "static_key_slow_inc" [net/ipv6/ipv6.ko] undefined!
>
> This change moves the check before all these references are added
> to KBUILD_CFLAGS.  This is correct because subsequent KBUILD_CFLAGS
> modifications are not relevant to this check.
>
> Reported-by: Anton V. Boyarshinov <boyarsh@...linux.org>
> Fixes: 35f860f9ba6a ("jump label: pass kbuild_cflags when checking for asm goto support")
> Cc: stable@...r.kernel.org      # v4.10
> Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>
> Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> ---

Acked-by: David Lin <dtwlin@...gle.com>