linux-kernel - Re: fs/buffer.c:2342:1: warning: the frame size of 2056 bytes is larger than 1024 bytes

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Date:   Sun, 3 Oct 2021 01:27:30 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     kernel test robot <lkp@...el.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: fs/buffer.c:2342:1: warning: the frame size of 2056 bytes is
 larger than 1024 bytes

On Sun, Oct 03, 2021 at 08:48:34AM +0800, kernel test robot wrote:
> Hi Christophe,

>         # save the attached .config to linux build tree

>    fs/buffer.c: In function 'block_read_full_page':
> >> fs/buffer.c:2342:1: warning: the frame size of 2056 bytes is larger than 1024 bytes [-Wframe-larger-than=]

fs/buffer.c:2259:       struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];

Now,
include/linux/buffer_head.h:44:#define MAX_BUF_PER_PAGE (PAGE_SIZE / 512)

so 'arr' in the above is PAGE_SIZE/512 pointers.  From the attached .config,
CONFIG_32BIT=y
and
# CONFIG_PPC_4K_PAGES is not set
# CONFIG_PPC_16K_PAGES is not set
# CONFIG_PPC_64K_PAGES is not set
CONFIG_PPC_256K_PAGES=y
CONFIG_PPC_PAGE_SHIFT=18

IOW, we have 256K/512 pointers, 4 bytes each, which amounts to 2K.  Just in
that array.

The rest of affected functions have similar local arrays...