From: Arnd Bergmann <arnd@arndb.de>
To: Yury Norov <ynorov@caviumnetworks.com>
Cc: Andreas Schwab <schwab@suse.de>,
catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-arch@vger.kernel.org, libc-alpha@sourceware.org,
schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com,
pinskia@gmail.com, broonie@kernel.org, joseph@codesourcery.com,
christoph.muellner@theobroma-systems.com,
bamvor.zhangjian@huawei.com, szabolcs.nagy@arm.com,
klimov.linux@gmail.com, Nathan_Lynch@mentor.com, agraf@suse.de,
Prasun.Kapoor@caviumnetworks.com, kilobyte@angband.pl,
geert@linux-m68k.org, philipp.tomsich@theobroma-systems.com,
manuel.montezelo@gmail.com, linyongting@huawei.com,
maxim.kuvyrkov@linaro.org, davem@davemloft.net
Subject: Re: [PATCH 01/19] compat ABI: use non-compat openat and open_by_handle_at variants
Date: Thu, 25 Aug 2016 17:52:11 +0200 [thread overview]
Message-ID: <3771388.9SFlpYVFmp@wuerfel> (raw)
In-Reply-To: <20160815143028.GA7193@yury-N73SV>
On Monday, August 15, 2016 5:30:28 PM CEST Yury Norov wrote:
> On Mon, Jun 27, 2016 at 09:47:38AM +0200, Andreas Schwab wrote:
> > Yury Norov <ynorov@caviumnetworks.com> writes:
> >
> > > The only difference is that non-compat version forces O_LARGEFILE,
> > > and it should be the default behaviour for all architectures, as
> > > we don't support 32-bit off_t. The only exception is tile32, that
> > > continues with compat version of syscalls.
> > >
> > > Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
> > > Acked-by: Arnd Bergmann <arnd@arndb.de>
> > > Acked-by: Chris Metcalf <cmetcalf@ezchip.com> [for tile]
> > > ---
> > > arch/tile/kernel/compat.c | 3 +++
> > > 1 file changed, 3 insertions(+)
> > >
> > > diff --git a/arch/tile/kernel/compat.c b/arch/tile/kernel/compat.c
> > > index 4912084..489ae19 100644
> > > --- a/arch/tile/kernel/compat.c
> > > +++ b/arch/tile/kernel/compat.c
> > > @@ -94,6 +94,9 @@ COMPAT_SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned int, offset_high,
> > > #define compat_sys_readahead sys32_readahead
> > > #define sys_llseek compat_sys_llseek
> > >
> > > +#define sys_openat compat_sys_openat
> > > +#define sys_open_by_handle_at compat_sys_open_by_handle_at
> > > +
> > > /* Call the assembly trampolines where necessary. */
> > > #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn
> > > #define sys_clone _sys_clone
> >
> > This is a no-op. Did you mean to add this? Without that the testsuite
> > of tar fails on ILP32.
>
> The change you suggest below is what I originally sent at the end of
> December, but that chunk was lost after one of numerous rebases probably.
>
> http://lkml.iu.edu/hypermail/linux/kernel/1512.3/00510.html
>
> IIRC, the only difference between this couple of syscalls and their
> compat versions is that non-compat syscalls set O_LARGEFILE depending
> on (BITS_PER_LONG != 32). Next patch of this series introduces
> ARCH_32BIT_OFF_T config option to force O_LARGEFILE for 64-bit arches,
> and all new 32-bit arches, as ARCH_32BIT_OFF_T is enabled for existing
> 32-bit arches explicitly.
>
> O_LARGEFILE is controlled like this:
> -#define force_o_largefile() (BITS_PER_LONG != 32)
> +#define force_o_largefile() (!IS_ENABLED(CONFIG_ARCH_32BIT_OFF_T))
>
> So if I restore original patch, everything will work. But my question
> is: if ARCH_32BIT_OFF_T disables O_LARGEFILE for tile32 anyway, what
> for we redirect native syscall handlers to compat ones? They are
> looking identical...
I've lost context here, but let me try to recall what we had
discussed in the past:
- native 32-bit architectures are handled using CONFIG_ARCH_32BIT_OFF_T
- native 64-bit architectures keep setting the flag.
- compat 32-bit architectures need special cases, but the only one
that exists is tile, which has to keep not setting O_LARGEFILE
while new compat architectures (ilp32) should set it.
> If my understanding is correct, we can drop the change in
> arch/tile/kernel/compat.c and join this patch with next one in this
> series.
>
> Chris, Arnd?
The change in arch/tile/kernel/compat.c can either come before the
below change, or in the same patch, but not later.
Arnd
> > diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> > index a26415b..4dcc38d 100644
> > --- a/include/uapi/asm-generic/unistd.h
> > +++ b/include/uapi/asm-generic/unistd.h
> > @@ -178,7 +178,7 @@ __SYSCALL(__NR_fchownat, sys_fchownat)
> > #define __NR_fchown 55
> > __SYSCALL(__NR_fchown, sys_fchown)
> > #define __NR_openat 56
> > -__SC_COMP(__NR_openat, sys_openat, compat_sys_openat)
> > +__SYSCALL(__NR_openat, sys_openat)
> > #define __NR_close 57
> > __SYSCALL(__NR_close, sys_close)
> > #define __NR_vhangup 58
> > @@ -676,8 +676,7 @@ __SYSCALL(__NR_fanotify_mark, sys_fanotify_mark)
> > #define __NR_name_to_handle_at 264
> > __SYSCALL(__NR_name_to_handle_at, sys_name_to_handle_at)
> > #define __NR_open_by_handle_at 265
> > -__SC_COMP(__NR_open_by_handle_at, sys_open_by_handle_at, \
> > - compat_sys_open_by_handle_at)
> > +__SYSCALL(__NR_open_by_handle_at, sys_open_by_handle_at)
> > #define __NR_clock_adjtime 266
> > __SC_COMP(__NR_clock_adjtime, sys_clock_adjtime, compat_sys_clock_adjtime)
> > #define __NR_syncfs 267
>
next prev parent reply other threads:[~2016-08-25 16:01 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-17 23:54 [RFC nowrap: PATCH v7 00/19] ILP32 for ARM64 Yury Norov
2016-06-17 23:54 ` [PATCH 01/19] compat ABI: use non-compat openat and open_by_handle_at variants Yury Norov
2016-06-27 7:47 ` Andreas Schwab
2016-08-15 14:30 ` Yury Norov
2016-08-25 15:52 ` Arnd Bergmann [this message]
2016-08-29 8:43 ` Yury Norov
2016-06-17 23:54 ` [PATCH 02/19] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option Yury Norov
2016-06-17 23:54 ` [PATCH 03/19] arm64: ilp32: add documentation on the ILP32 ABI for ARM64 Yury Norov
2016-06-17 23:54 ` [PATCH 04/19] arm64: ensure the kernel is compiled for LP64 Yury Norov
2016-06-17 23:54 ` [PATCH 05/19] arm64: rename COMPAT to AARCH32_EL0 in Kconfig Yury Norov
2016-08-11 7:35 ` Zhangjian (Bamvor)
2016-08-11 8:53 ` Arnd Bergmann
2016-08-11 14:50 ` Catalin Marinas
2016-08-11 15:16 ` Arnd Bergmann
2016-08-11 16:30 ` Catalin Marinas
2016-08-11 20:29 ` Arnd Bergmann
2016-08-12 14:36 ` Catalin Marinas
2016-08-13 15:17 ` Yury Norov
2016-08-15 9:38 ` Catalin Marinas
2016-06-17 23:54 ` [PATCH 06/19] arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64 Yury Norov
2016-06-17 23:54 ` [PATCH 07/19] thread: move thread bits accessors to separated file Yury Norov
2016-06-17 23:54 ` [PATCH 08/19] arm64: introduce is_a32_task and is_a32_thread (for AArch32 compat) Yury Norov
2016-06-21 10:23 ` Zhangjian (Bamvor)
2016-06-21 11:34 ` Andreas Schwab
2016-06-21 15:47 ` Arnd Bergmann
2016-06-17 23:54 ` [PATCH 09/19] arm64: ilp32: add is_ilp32_compat_{task,thread} and TIF_32BIT_AARCH64 Yury Norov
2016-06-17 23:54 ` [PATCH 10/19] arm64: introduce binfmt_elf32.c Yury Norov
2016-06-17 23:54 ` [PATCH 11/19] arm64: ilp32: introduce binfmt_ilp32.c Yury Norov
2016-06-17 23:54 ` [PATCH 12/19] arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32 Yury Norov
2016-06-27 4:47 ` zhouchengming
2016-06-27 4:49 ` [PATCH] ilp32: fix {GET,SET}SIGMASK request for ptrace zhouchengming
2016-06-27 5:39 ` Yury Norov
2016-06-27 10:30 ` zhouchengming
2016-08-13 14:52 ` Yury Norov
2016-06-17 23:54 ` [PATCH 13/19] arm64: ilp32: share aarch32 syscall handlers Yury Norov
2016-06-17 23:54 ` [PATCH 14/19] arm64: ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Yury Norov
2016-06-20 12:48 ` Yury Norov
2016-06-17 23:54 ` [PATCH 15/19] arm64: signal: share lp64 signal routines to ilp32 Yury Norov
2016-06-17 23:54 ` [PATCH 16/19] arm64: signal32: move ilp32 and aarch32 common code to separated file Yury Norov
2016-06-17 23:54 ` [PATCH 17/19] arm64: ilp32: introduce ilp32-specific handlers for sigframe and ucontext Yury Norov
2016-06-17 23:54 ` [PATCH 18/19] arm64:ilp32: add vdso-ilp32 and use for signal return Yury Norov
2016-06-20 14:54 ` Andreas Schwab
2016-08-13 14:54 ` Yury Norov
2016-06-17 23:54 ` [PATCH 19/19] arm64:ilp32: add ARM64_ILP32 to Kconfig Yury Norov
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