linux-kernel - Re: [PATCH 1/2] shmem: fix tmpfs to handle the huge= option properly

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Message-Id: <8737ksw69p.fsf@linux.vnet.ibm.com>
Date:   Thu, 22 Sep 2016 16:28:10 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:     Toshi Kani <toshi.kani@....com>, akpm@...ux-foundation.org
Cc:     dan.j.williams@...el.com, mawilcox@...rosoft.com, hughd@...gle.com,
        kirill.shutemov@...ux.intel.com, toshi.kani@....com,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] shmem: fix tmpfs to handle the huge= option properly

Toshi Kani <toshi.kani@....com> writes:

> shmem_get_unmapped_area() checks SHMEM_SB(sb)->huge incorrectly,
> which leads to a reversed effect of "huge=" mount option.
>
> Fix the check in shmem_get_unmapped_area().
>
> Note, the default value of SHMEM_SB(sb)->huge remains as
> SHMEM_HUGE_NEVER.  User will need to specify "huge=" option to
> enable huge page mappings.
>

Any update on getting this merged ?

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

> Reported-by: Hillf Danton <hillf.zj@...baba-inc.com>
> Signed-off-by: Toshi Kani <toshi.kani@....com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Hugh Dickins <hughd@...gle.com>
> ---
>  mm/shmem.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/shmem.c b/mm/shmem.c
> index fd8b2b5..aec5b49 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -1980,7 +1980,7 @@ unsigned long shmem_get_unmapped_area(struct file *file,
>  				return addr;
>  			sb = shm_mnt->mnt_sb;
>  		}
> -		if (SHMEM_SB(sb)->huge != SHMEM_HUGE_NEVER)
> +		if (SHMEM_SB(sb)->huge == SHMEM_HUGE_NEVER)
>  			return addr;
>  	}
>  
>
> --
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