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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Christoph Hellwig <hch@lst.de>
Cc: kbuild test robot <lkp@intel.com>,
	kbuild-all@01.org, linux-fsdevel@vger.kernel.org,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	viro@zeniv.linux.org.uk, x86@kernel.org
Subject: Re: [vfs:hch.aio 7/40] include/linux/syscalls.h:233:18: warning: 'sys_io_pgetevents' alias between functions of incompatible types 'long int(aio_context_t,  long int,  long int,  struct io_event *, struct timespec *, const struct __aio_sigset *)' and 'long int(long int,  long int,  long int,  long int,  long int,  long int)'
Date: Tue, 29 May 2018 09:20:24 +0200	[thread overview]
Message-ID: <20180529072024.GA21375@kroah.com> (raw)
In-Reply-To: <20180529072001.GA393@lst.de>

On Tue, May 29, 2018 at 09:20:01AM +0200, Christoph Hellwig wrote:
> I'm not seeing anything like this in my i386 builds.  Is this
> something new in gcc 8.1?  Also it seems deeply hidden in the syscall
> macros, so I might need some help understanding those.
> 
> On Tue, May 29, 2018 at 11:12:31AM +0800, kbuild test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git hch.aio
> > head:   89b310a2b28dafbf3958e292785d51b7017da19e
> > commit: 7a074e96dee62586c935c80cecd931431bfdd0be [7/40] aio: implement io_pgetevents
> > config: i386-randconfig-c0-05290848 (attached as .config)
> > compiler: gcc-8 (Debian 8.1.0-3) 8.1.0
> > reproduce:
> >         git checkout 7a074e96dee62586c935c80cecd931431bfdd0be
> >         # save the attached .config to linux build tree
> >         make ARCH=i386 
> > 
> > All warnings (new ones prefixed by >>):
> > 
> >    In file included from fs/aio.c:19:
> >    include/linux/syscalls.h:233:18: warning: 'sys_io_setup' alias between functions of incompatible types 'long int(unsigned int,  aio_context_t *)' and 'long int(long int,  long int)' [-Wattribute-alias]
> >      asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> >                      ^~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:212:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE2(name, ...) SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1322:1: note: in expansion of macro 'SYSCALL_DEFINE2'
> >     SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:238:18: note: aliased declaration here
> >      asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> >                      ^~~~~~~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:212:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE2(name, ...) SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1322:1: note: in expansion of macro 'SYSCALL_DEFINE2'
> >     SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
> >     ^~~~~~~~~~~~~~~
> > >> include/linux/syscalls.h:233:18: warning: 'sys_io_pgetevents' alias between functions of incompatible types 'long int(aio_context_t,  long int,  long int,  struct io_event *, struct timespec *, const struct __aio_sigset *)' and 'long int(long int,  long int,  long int,  long int,  long int,  long int)' [-Wattribute-alias]
> >      asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> >                      ^~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:216:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1931:1: note: in expansion of macro 'SYSCALL_DEFINE6'
> >     SYSCALL_DEFINE6(io_pgetevents,
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:238:18: note: aliased declaration here
> >      asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> >                      ^~~~~~~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:216:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1931:1: note: in expansion of macro 'SYSCALL_DEFINE6'
> >     SYSCALL_DEFINE6(io_pgetevents,
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:233:18: warning: 'sys_io_getevents' alias between functions of incompatible types 'long int(aio_context_t,  long int,  long int,  struct io_event *, struct timespec *)' and 'long int(long int,  long int,  long int,  long int,  long int)' [-Wattribute-alias]
> >      asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> >                      ^~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:215:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE5(name, ...) SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1913:1: note: in expansion of macro 'SYSCALL_DEFINE5'
> >     SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:238:18: note: aliased declaration here
> >      asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> >                      ^~~~~~~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:215:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE5(name, ...) SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1913:1: note: in expansion of macro 'SYSCALL_DEFINE5'
> >     SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:233:18: warning: 'sys_io_cancel' alias between functions of incompatible types 'long int(aio_context_t,  struct iocb *, struct io_event *)' and 'long int(long int,  long int,  long int)' [-Wattribute-alias]
> >      asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> >                      ^~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1842:1: note: in expansion of macro 'SYSCALL_DEFINE3'
> >     SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb,
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:238:18: note: aliased declaration here
> >      asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> >                      ^~~~~~~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1842:1: note: in expansion of macro 'SYSCALL_DEFINE3'
> >     SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb,
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:233:18: warning: 'sys_io_submit' alias between functions of incompatible types 'long int(aio_context_t,  long int,  struct iocb **)' and 'long int(long int,  long int,  long int)' [-Wattribute-alias]
> >      asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> >                      ^~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1767:1: note: in expansion of macro 'SYSCALL_DEFINE3'
> >     SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:238:18: note: aliased declaration here
> >      asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> >                      ^~~~~~~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
> >      ^~~~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:213:36: note: in expansion of macro 'SYSCALL_DEFINEx'
> >     #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
> >                                        ^~~~~~~~~~~~~~~
> >    fs/aio.c:1767:1: note: in expansion of macro 'SYSCALL_DEFINE3'
> >     SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
> >     ^~~~~~~~~~~~~~~
> >    include/linux/syscalls.h:233:18: warning: 'sys_io_destroy' alias between functions of incompatible types 'long int(aio_context_t)' and 'long int(long int)' [-Wattribute-alias]
> >      asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
> >                      ^~~
> >    include/linux/syscalls.h:222:2: note: in expansion of macro '__SYSCALL_DEFINEx'
> >      __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)

I was seeing this type of mess when trying to build with gcc-8.1, and
could not figure it out either.  So I just gave up and went back to
gcc-7 for the time being.  I don't think it's anything new you did here.

thanks,

greg k-h

  reply	other threads:[~2018-05-29  7:20 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-29  3:12 [vfs:hch.aio 7/40] include/linux/syscalls.h:233:18: warning: 'sys_io_pgetevents' alias between functions of incompatible types 'long int(aio_context_t, long int, long int, struct io_event *, struct timespec *, const struct __aio_sigset *)' and 'long int(long int, long int, long int, long int, long int, long int)' kbuild test robot
2018-05-29  7:20 ` Christoph Hellwig
2018-05-29  7:20   ` Greg Kroah-Hartman [this message]
2018-05-29  8:05     ` [kbuild-all] " Philip Li
2018-05-29 11:29       ` Matthew Wilcox
2018-05-29 13:00         ` Greg Kroah-Hartman
2018-05-29 14:59           ` Philip Li
2018-05-29 14:58         ` Philip Li

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