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

From: Stephen Rothwell
Date: Tue Jun 22 2021 - 18:39:07 EST

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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")

--
Cheers,
Stephen Rothwell

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