linux-kernel - Re: [RFC6 PATCH v6 00/21] ILP32 for ARM64

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Date:	Fri, 13 May 2016 12:03:03 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Yury Norov <ynorov@...iumnetworks.com>
Cc:	linux-arch@...r.kernel.org, linux-s390@...r.kernel.org,
	Kefeng Wang <wangkefeng.wang@...wei.com>, arnd@...db.de,
	pinskia@...il.com, Prasun.Kapoor@...iumnetworks.com,
	Nathan_Lynch@...tor.com, linux-doc@...r.kernel.org,
	heiko.carstens@...ibm.com, linux-kernel@...r.kernel.org,
	agraf@...e.de, klimov.linux@...il.com, broonie@...nel.org,
	"Zhangjian (Bamvor)" <bamvor.zhangjian@...wei.com>,
	joseph@...esourcery.com, schwab@...e.de, schwidefsky@...ibm.com,
	linux-arm-kernel@...ts.infradead.org,
	christoph.muellner@...obroma-systems.com
Subject: Re: [RFC6 PATCH v6 00/21] ILP32 for ARM64

On Fri, May 13, 2016 at 01:51:15PM +0300, Yury Norov wrote:
> On Fri, May 13, 2016 at 09:28:03AM +0000, Catalin Marinas wrote:
> > The discussion is mainly around whether USER_DS for 32-bit compat apps
> > should be the same as USER_DS for native 32-bit apps. Even for native
> > 32-bit kernels, we don't use STACK_TOP as addr_limit. A read/write from
> > 0xffffffff would fail in both cases anyway. I think the LTP test doesn't
> > even try to access such memory but only to probe the range validity (I
> > haven't managed to build the latest LTP yet).
> 
> This fix lets me build it (on top of 7b3ef3b0b)
> Of course, it's not 'official'. :)
[...]
> --- a/testcases/kernel/syscalls/fstatat/fstatat01.c
> +++ b/testcases/kernel/syscalls/fstatat/fstatat01.c
> @@ -59,6 +59,7 @@ static const char *filenames[TEST_CASES];
>  static const int expected_errno[] = { 0, 0, ENOTDIR, EBADF, EINVAL, 0 };
>  static const int flags[] = { 0, 0, 0, 0, 9999, 0 };
>  
> +#define HAVE_FSTATAT
>  #if !defined(HAVE_FSTATAT)
>  #if (__NR_fstatat64 > 0)
>  int fstatat(int dirfd, const char *filename, struct stat64 *statbuf, int flags)
> diff --git a/testcases/kernel/syscalls/preadv/preadv.h b/testcases/kernel/syscalls/preadv/preadv.h
> index f3ac30d..b001389 100644
> --- a/testcases/kernel/syscalls/preadv/preadv.h
> +++ b/testcases/kernel/syscalls/preadv/preadv.h
> @@ -21,6 +21,7 @@
>  #include "config.h"
>  #include "linux_syscall_numbers.h"
>  
> +#define HAVE_PREADV
>  #if !defined(HAVE_PREADV)
>  int preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset)
>  {
> diff --git a/testcases/kernel/syscalls/pwritev/pwritev.h b/testcases/kernel/syscalls/pwritev/pwritev.h
> index ae9d999..2a4d188 100644
> --- a/testcases/kernel/syscalls/pwritev/pwritev.h
> +++ b/testcases/kernel/syscalls/pwritev/pwritev.h
> @@ -21,6 +21,7 @@
>  #include "config.h"
>  #include "linux_syscall_numbers.h"
>  
> +#define HAVE_PWRITEV
>  #if !defined(HAVE_PWRITEV)
>  int pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset)
>  {

I didn't need any of these defines as they are automatically generated
in include/config.h for AArch32. However, I need to run autoreconf to
generate the configure script prior to building (archlinuxarm
filesystem)

-- 
Catalin