linux-kernel - Re: [PATCH 03/10] mm/ksm: remove old GCC 4.9+ check

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Date:   Fri, 10 Sep 2021 17:07:47 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Joe Perches <joe@...ches.com>, Arnd Bergmann <arnd@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/10] mm/ksm: remove old GCC 4.9+ check

On Fri, Sep 10, 2021 at 04:40:40PM -0700, Nick Desaulniers wrote:
> The minimum supported version of GCC has been raised to GCC 5.1.
> 
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

This is technically new for clang but arm64 allmodconfig does not
complain.

> ---
>  mm/ksm.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/mm/ksm.c b/mm/ksm.c
> index 025338128cd9..a5716fdec1aa 100644
> --- a/mm/ksm.c
> +++ b/mm/ksm.c
> @@ -651,10 +651,8 @@ static void remove_node_from_stable_tree(struct stable_node *stable_node)
>  	 * from &migrate_nodes. This will verify that future list.h changes
>  	 * don't break STABLE_NODE_DUP_HEAD. Only recent gcc can handle it.

Probably worth removing the recent GCC comment.

>  	 */
> -#if defined(GCC_VERSION) && GCC_VERSION >= 40903
>  	BUILD_BUG_ON(STABLE_NODE_DUP_HEAD <= &migrate_nodes);
>  	BUILD_BUG_ON(STABLE_NODE_DUP_HEAD >= &migrate_nodes + 1);
> -#endif
>  
>  	if (stable_node->head == &migrate_nodes)
>  		list_del(&stable_node->list);
> -- 
> 2.33.0.309.g3052b89438-goog
> 
>