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Subject: Re: linux-next: build warning after merge of the kspp-gustavo tree
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Kees Cook <keescook@chromium.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        David Sterba <dsterba@suse.cz>
References: <20210623083901.1d49d19d@canb.auug.org.au>
From:   "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Message-ID: <a6770d54-7d40-5c21-2d21-f2e25cc5756e@embeddedor.com>
Date:   Tue, 22 Jun 2021 17:46:25 -0500
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Hi Stephen,

I will remove that commit and work on fixing those issues before
trying again.

Thanks for the report!
--
Gustavo

On 6/22/21 17:39, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the kspp-gustavo tree, today's linux-next build (powerpc
> ppc64_defconfig) produced this warning:
> 
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_get_token_16':
> fs/btrfs/struct-funcs.c:80:46: warning: array subscript 1 is above array bounds of 'struct page *[1]' [-Warray-bounds]
>    80 |  token->kaddr = page_address(token->eb->pages[idx + 1]);  \
>       |                              ~~~~~~~~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:161:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   161 | DEFINE_BTRFS_SETGET_BITS(16)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_get_16':
> fs/btrfs/struct-funcs.c:101:32: warning: array subscript 1 is above array bounds of 'struct page * const[1]' [-Warray-bounds]
>   101 |  kaddr = page_address(eb->pages[idx + 1]);   \
>       |                       ~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:161:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   161 | DEFINE_BTRFS_SETGET_BITS(16)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_set_token_16':
> fs/btrfs/struct-funcs.c:133:46: warning: array subscript 1 is above array bounds of 'struct page *[1]' [-Warray-bounds]
>   133 |  token->kaddr = page_address(token->eb->pages[idx + 1]);  \
>       |                              ~~~~~~~~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:161:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   161 | DEFINE_BTRFS_SETGET_BITS(16)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_set_16':
> fs/btrfs/struct-funcs.c:156:32: warning: array subscript 1 is above array bounds of 'struct page * const[1]' [-Warray-bounds]
>   156 |  kaddr = page_address(eb->pages[idx + 1]);   \
>       |                       ~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:161:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   161 | DEFINE_BTRFS_SETGET_BITS(16)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_get_token_32':
> fs/btrfs/struct-funcs.c:80:46: warning: array subscript 1 is above array bounds of 'struct page *[1]' [-Warray-bounds]
>    80 |  token->kaddr = page_address(token->eb->pages[idx + 1]);  \
>       |                              ~~~~~~~~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:162:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   162 | DEFINE_BTRFS_SETGET_BITS(32)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_get_32':
> fs/btrfs/struct-funcs.c:101:32: warning: array subscript 1 is above array bounds of 'struct page * const[1]' [-Warray-bounds]
>   101 |  kaddr = page_address(eb->pages[idx + 1]);   \
>       |                       ~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:162:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   162 | DEFINE_BTRFS_SETGET_BITS(32)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_set_token_32':
> fs/btrfs/struct-funcs.c:133:46: warning: array subscript 1 is above array bounds of 'struct page *[1]' [-Warray-bounds]
>   133 |  token->kaddr = page_address(token->eb->pages[idx + 1]);  \
>       |                              ~~~~~~~~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:162:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   162 | DEFINE_BTRFS_SETGET_BITS(32)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_set_32':
> fs/btrfs/struct-funcs.c:156:32: warning: array subscript 1 is above array bounds of 'struct page * const[1]' [-Warray-bounds]
>   156 |  kaddr = page_address(eb->pages[idx + 1]);   \
>       |                       ~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:162:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   162 | DEFINE_BTRFS_SETGET_BITS(32)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_get_token_64':
> fs/btrfs/struct-funcs.c:80:46: warning: array subscript 1 is above array bounds of 'struct page *[1]' [-Warray-bounds]
>    80 |  token->kaddr = page_address(token->eb->pages[idx + 1]);  \
>       |                              ~~~~~~~~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:163:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   163 | DEFINE_BTRFS_SETGET_BITS(64)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_get_64':
> fs/btrfs/struct-funcs.c:101:32: warning: array subscript 1 is above array bounds of 'struct page * const[1]' [-Warray-bounds]
>   101 |  kaddr = page_address(eb->pages[idx + 1]);   \
>       |                       ~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:163:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   163 | DEFINE_BTRFS_SETGET_BITS(64)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_set_token_64':
> fs/btrfs/struct-funcs.c:133:46: warning: array subscript 1 is above array bounds of 'struct page *[1]' [-Warray-bounds]
>   133 |  token->kaddr = page_address(token->eb->pages[idx + 1]);  \
>       |                              ~~~~~~~~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:163:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   163 | DEFINE_BTRFS_SETGET_BITS(64)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from fs/btrfs/ctree.h:9,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/struct-funcs.c: In function 'btrfs_set_64':
> fs/btrfs/struct-funcs.c:156:32: warning: array subscript 1 is above array bounds of 'struct page * const[1]' [-Warray-bounds]
>   156 |  kaddr = page_address(eb->pages[idx + 1]);   \
>       |                       ~~~~~~~~~^~~~~~~~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> fs/btrfs/struct-funcs.c:163:1: note: in expansion of macro 'DEFINE_BTRFS_SETGET_BITS'
>   163 | DEFINE_BTRFS_SETGET_BITS(64)
>       | ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/struct-funcs.c:8:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> In file included from include/linux/bvec.h:14,
>                  from include/linux/blk_types.h:10,
>                  from include/linux/genhd.h:19,
>                  from include/linux/blkdev.h:8,
>                  from fs/btrfs/disk-io.c:7:
> fs/btrfs/disk-io.c: In function 'csum_tree_block':
> fs/btrfs/disk-io.c:225:34: warning: array subscript 1 is above array bounds of 'struct page *[1]' [-Warray-bounds]
>   225 |   kaddr = page_address(buf->pages[i]);
>       |                        ~~~~~~~~~~^~~
> include/linux/mm.h:1627:48: note: in definition of macro 'page_address'
>  1627 | #define page_address(page) lowmem_page_address(page)
>       |                                                ^~~~
> In file included from fs/btrfs/ctree.h:32,
>                  from fs/btrfs/disk-io.c:22:
> fs/btrfs/extent_io.h:97:15: note: while referencing 'pages'
>    97 |  struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
>       |               ^~~~~
> 
> Introduced by commit
> 
>   8d7900f545f1 ("Makefile: Enable -Warray-bounds")
>