From: kernel test robot <lkp@intel.com>
To: Eric Dumazet <edumazet@google.com>
Cc: oe-kbuild-all@lists.linux.dev,
Linux Memory Management List <linux-mm@kvack.org>,
Paolo Abeni <pabeni@redhat.com>, David Ahern <dsahern@kernel.org>
Subject: [linux-next:master 5136/13299] include/asm-generic/rwonce.h:44:26: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'}
Date: Wed, 18 Oct 2023 18:59:33 +0800 [thread overview]
Message-ID: <202310181854.pKtHd7fD-lkp@intel.com> (raw)
Hi Eric,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 2dac75696c6da3c848daa118a729827541c89d33
commit: fa17a6d8a5bd0cd7565b613cb804242cd0f6b7ab [5136/13299] ipv6: lockless IPV6_ADDR_PREFERENCES implementation
config: alpha-defconfig (https://download.01.org/0day-ci/archive/20231018/202310181854.pKtHd7fD-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231018/202310181854.pKtHd7fD-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310181854.pKtHd7fD-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from arch/alpha/include/asm/rwonce.h:33,
from include/linux/compiler.h:246,
from include/linux/string.h:5,
from net/sunrpc/xprtsock.c:23:
In function 'ip6_sock_set_addr_preferences',
inlined from 'xs_tcp_finish_connecting' at net/sunrpc/xprtsock.c:2325:4,
inlined from 'xs_tcp_setup_socket' at net/sunrpc/xprtsock.c:2405:11:
>> include/asm-generic/rwonce.h:44:26: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=]
44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:55:40: note: in definition of macro '__WRITE_ONCE'
55 | *(volatile typeof(x) *)&(x) = (val); \
| ^~~
include/net/ipv6.h:1365:9: note: in expansion of macro 'WRITE_ONCE'
1365 | WRITE_ONCE(inet6_sk(sk)->srcprefs,
| ^~~~~~~~~~
include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
50 | __READ_ONCE(x); \
| ^~~~~~~~~~~
include/net/ipv6.h:1366:21: note: in expansion of macro 'READ_ONCE'
1366 | (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref);
| ^~~~~~~~~
In function 'xs_tcp_setup_socket':
cc1: note: source object is likely at address zero
In function 'ip6_sock_set_addr_preferences',
inlined from 'xs_tcp_finish_connecting' at net/sunrpc/xprtsock.c:2325:4,
inlined from 'xs_tcp_setup_socket' at net/sunrpc/xprtsock.c:2405:11:
include/asm-generic/rwonce.h:55:37: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=]
55 | *(volatile typeof(x) *)&(x) = (val); \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
include/asm-generic/rwonce.h:61:9: note: in expansion of macro '__WRITE_ONCE'
61 | __WRITE_ONCE(x, val); \
| ^~~~~~~~~~~~
include/net/ipv6.h:1365:9: note: in expansion of macro 'WRITE_ONCE'
1365 | WRITE_ONCE(inet6_sk(sk)->srcprefs,
| ^~~~~~~~~~
In function 'xs_tcp_setup_socket':
cc1: note: source object is likely at address zero
In function 'ip6_sock_set_addr_preferences',
inlined from 'xs_tcp_tls_finish_connecting' at net/sunrpc/xprtsock.c:2478:4:
>> include/asm-generic/rwonce.h:44:26: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=]
44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:55:40: note: in definition of macro '__WRITE_ONCE'
55 | *(volatile typeof(x) *)&(x) = (val); \
| ^~~
include/net/ipv6.h:1365:9: note: in expansion of macro 'WRITE_ONCE'
1365 | WRITE_ONCE(inet6_sk(sk)->srcprefs,
| ^~~~~~~~~~
include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
50 | __READ_ONCE(x); \
| ^~~~~~~~~~~
include/net/ipv6.h:1366:21: note: in expansion of macro 'READ_ONCE'
1366 | (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref);
| ^~~~~~~~~
In function 'xs_tcp_tls_finish_connecting':
cc1: note: source object is likely at address zero
In function 'ip6_sock_set_addr_preferences',
inlined from 'xs_tcp_tls_finish_connecting' at net/sunrpc/xprtsock.c:2478:4:
include/asm-generic/rwonce.h:55:37: warning: array subscript 0 is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=]
55 | *(volatile typeof(x) *)&(x) = (val); \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
include/asm-generic/rwonce.h:61:9: note: in expansion of macro '__WRITE_ONCE'
61 | __WRITE_ONCE(x, val); \
| ^~~~~~~~~~~~
include/net/ipv6.h:1365:9: note: in expansion of macro 'WRITE_ONCE'
1365 | WRITE_ONCE(inet6_sk(sk)->srcprefs,
| ^~~~~~~~~~
In function 'xs_tcp_tls_finish_connecting':
cc1: note: source object is likely at address zero
vim +44 include/asm-generic/rwonce.h
e506ea451254ab Will Deacon 2019-10-15 28
e506ea451254ab Will Deacon 2019-10-15 29 /*
e506ea451254ab Will Deacon 2019-10-15 30 * Yes, this permits 64-bit accesses on 32-bit architectures. These will
e506ea451254ab Will Deacon 2019-10-15 31 * actually be atomic in some cases (namely Armv7 + LPAE), but for others we
e506ea451254ab Will Deacon 2019-10-15 32 * rely on the access being split into 2x32-bit accesses for a 32-bit quantity
e506ea451254ab Will Deacon 2019-10-15 33 * (e.g. a virtual address) and a strong prevailing wind.
e506ea451254ab Will Deacon 2019-10-15 34 */
e506ea451254ab Will Deacon 2019-10-15 35 #define compiletime_assert_rwonce_type(t) \
e506ea451254ab Will Deacon 2019-10-15 36 compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
e506ea451254ab Will Deacon 2019-10-15 37 "Unsupported access size for {READ,WRITE}_ONCE().")
e506ea451254ab Will Deacon 2019-10-15 38
e506ea451254ab Will Deacon 2019-10-15 39 /*
e506ea451254ab Will Deacon 2019-10-15 40 * Use __READ_ONCE() instead of READ_ONCE() if you do not require any
3c9184109e78ea Will Deacon 2019-10-30 41 * atomicity. Note that this may result in tears!
e506ea451254ab Will Deacon 2019-10-15 42 */
b78b331a3f5c07 Will Deacon 2019-10-15 43 #ifndef __READ_ONCE
e506ea451254ab Will Deacon 2019-10-15 @44 #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
b78b331a3f5c07 Will Deacon 2019-10-15 45 #endif
e506ea451254ab Will Deacon 2019-10-15 46
:::::: The code at line 44 was first introduced by commit
:::::: e506ea451254ab17e0bf918ca36232fec2a9b10c compiler.h: Split {READ,WRITE}_ONCE definitions out into rwonce.h
:::::: TO: Will Deacon <will@kernel.org>
:::::: CC: Will Deacon <will@kernel.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2023-10-18 11:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-18 10:59 kernel test robot [this message]
2023-10-18 11:38 ` Eric Dumazet
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