linux-kernel - Re: [PATCH] mm/shmem: fix build failure when CONFIG_TRANSPARENT

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Date:   Sat, 7 May 2022 11:55:11 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     cgel.zte@...il.com
Cc:     hughd@...gle.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Yang Yang <yang.yang29@....com.cn>,
        Zeal Robot <zealci@....com.cn>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] mm/shmem: fix build failure when
 CONFIG_TRANSPARENT_HUGEPAGE is not set

On Thu,  5 May 2022 11:33:55 +0000 cgel.zte@...il.com wrote:

> From: Yang Yang <yang.yang29@....com.cn>
> 
> shmem_add_to_page_cache() use THP_FILE_FALLBACK even if
> CONFIG_TRANSPARENT_HUGEPAGE is not set and triggers this
> compile error.
> 
> Add ifdef CONFIG_TRANSPARENT_HUGEPAGE in shmem_add_to_page_cache().

Thanks.

> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -717,10 +717,12 @@ static int shmem_add_to_page_cache(struct folio *folio,
>  	if (!folio_test_swapcache(folio)) {
>  		error = mem_cgroup_charge(folio, charge_mm, gfp);
>  		if (error) {
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  			if (folio_test_large(folio)) {
>  				count_vm_event(THP_FILE_FALLBACK);
>  				count_vm_event(THP_FILE_FALLBACK_CHARGE);
>  			}
> +#endif
>  			goto error;
>  		}
>  	}

I believe Matthew address this in version 2 of "Folio patches for
5.19".

I'm aiming to get that (and much more!) pushed out or Monday's linux-next.