Subject: Re: linux-next: build warning after merge of the kspp-gustavo tree

From: "Gustavo A. R. Silva" <[email-masked]>
Date: Tue, 22 Jun 2021 18:01:02 -0500

On 6/22/21 17:46, Gustavo A. R. Silva wrote:
> Hi Stephen,
> 
> I will remove that commit and work on fixing those issues before
> trying again.

Done:

I just removed commit 8d7900f545f1 ("Makefile: Enable -Warray-bounds"):

https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/log/?h=for-next/kspp

Sorry for the noise.

Thanks
--
Gustavo

> 
> 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")
>>