linux-kernel - Re: [PATCH] mm/shmem: restore setting of page variable

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Date:   Mon, 9 May 2022 11:03:56 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Tom Rix <trix@...hat.com>
Cc:     hughd@...gle.com, nathan@...nel.org, ndesaulniers@...gle.com,
        willy@...radead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] mm/shmem: restore setting of page variable

On Mon,  9 May 2022 08:32:32 -0400 Tom Rix <trix@...hat.com> wrote:

> The clang build fails with
> mm/shmem.c:2337:8: error: variable 'page' is uninitialized when used here [-Werror,-Wuninitialized]
>   if (!page)
>        ^~~~
> 
> In the commit listed in the fixes, there was a change to the
> from
>   page = shmem_alloc_page(..);
> to
>   page = &shmem_alloc_folio(..)->page;
> But in this case, instead of replacing, the setting of page was
> deleted.  So restore page with its new api.
> 
> ...
>
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -2334,6 +2334,7 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
>  
>  	if (!*pagep) {
>  		ret = -ENOMEM;
> +		page = &shmem_alloc_folio(gfp, info, pgoff)->page;
>  		if (!page)
>  			goto out_unacct_blocks;
>  

Thanks, this is fixed in v2 of Matthew's "Folio patches for 5.19"
series.

I've just now pushed all that out to kernel.org so next linux-next
should be a happier place.