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From: Huacai Chen <chenhuacai@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Huacai Chen <chenhuacai@loongson.cn>,
	Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Airlie <airlied@linux.ie>, Jonathan Corbet <corbet@lwn.net>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Xuefeng Li <lixuefeng@loongson.cn>,
	Yanteng Si <siyanteng@loongson.cn>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: Re: [PATCH V3 13/22] LoongArch: Add system call support
Date: Sat, 18 Sep 2021 14:55:02 +0800	[thread overview]
Message-ID: <CAAhV-H7kaYAGz85pNFo0tSObS7A36vetBWUM9oEGCPH_b1AN-w@mail.gmail.com> (raw)
In-Reply-To: <CAK8P3a3Ce0bsyrhEK1SZHtUPEnX-rvQcKLT-TPRGptNdmiJaqQ@mail.gmail.com>

Hi, Arnd,

On Fri, Sep 17, 2021 at 4:24 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Fri, Sep 17, 2021 at 5:57 AM Huacai Chen <chenhuacai@loongson.cn> wrote:
> > +#define NR_syscalls (__NR_syscalls)
> > diff --git a/arch/loongarch/include/uapi/asm/unistd.h b/arch/loongarch/include/uapi/asm/unistd.h
> > new file mode 100644
> > index 000000000000..b344b1f91715
> > --- /dev/null
> > +++ b/arch/loongarch/include/uapi/asm/unistd.h
> > @@ -0,0 +1,6 @@
> > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > +#define __ARCH_WANT_NEW_STAT
> > +#define __ARCH_WANT_SYS_CLONE
> > +#define __ARCH_WANT_SYS_CLONE3
>
> I still think you need to remove __ARCH_WANT_NEW_STAT and
> __ARCH_WANT_SYS_CLONE here.
>
> I understand that those are needed for the transitional period when you
> still need to support your existing glibc library files, but you likely still
> have other kernel patches that are not part of this series, so I suggest
> you add those two lines as a custom patch there until you are ready to
> drop support for old libc.
The clone story:
When I sent V1 of this series, the upstream glibc (2.33) hadn't merge
the clone3 support. Now glibc 2.34 has merged clone3, so
__ARCH_WANT_SYS_CLONE seems can be removed. But I think there is
someone just download this series and suppose it can work with current
userspace. So I want to keep it for a while, until this series can be
merged.

The statx story:
The latest upstream glibc (2.34) is still like this
(sysdeps/unix/sysv/linux/fstatat64.c):
#if (__WORDSIZE == 32 \
     && (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32)) \
     || defined STAT_HAS_TIME32
# define FSTATAT_USE_STATX 1
#else
# define FSTATAT_USE_STATX 0
#endif

This means statx is supposed to use in 32bit systems, or 64bit systems
with 32bit timestamp (e.g. MIPS64). So I think __ARCH_WANT_NEW_STAT is
still needed.


>
> > +
> > +SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
> > +       unsigned long, prot, unsigned long, flags, unsigned long,
> > +       fd, off_t, offset)
> > +{
> > +       if (offset & ~PAGE_MASK)
> > +               return -EINVAL;
> > +       return ksys_mmap_pgoff(addr, len, prot, flags, fd,
> > +                              offset >> PAGE_SHIFT);
> > +}
> > +
> > +SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
> > +       unsigned long, prot, unsigned long, flags, unsigned long, fd,
> > +       unsigned long, pgoff)
> > +{
> > +       if (pgoff & (~PAGE_MASK >> 12))
> > +               return -EINVAL;
> > +
> > +       return ksys_mmap_pgoff(addr, len, prot, flags, fd,
> > +                              pgoff >> (PAGE_SHIFT - 12));
> > +}
>
> sys_mmap2() is only used on 32-bit architectures, you only need
> sys_mmap() here.
>
> Ideally we'd just move those two definitions you have here into
> mm/mmap.c and remove all the duplicate definitions. Maybe
> you can come up with a patch to do this?
>
> Note that some architectures use either nonstandard names,
> or shift value other than 12, so those need to keep their own
> versions.
OK, sys_mmap2() will be removed. But can "move sys_mmap() to
mm/mmap.c" be done by others? (I think my credit is not enough to do
this, at least now).

Huacai
>
>       Arnd

  reply	other threads:[~2021-09-18  6:55 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17  3:57 [PATCH V3 00/22] arch: Add basic LoongArch support Huacai Chen
2021-09-17  3:57 ` [PATCH V3 01/22] Documentation: LoongArch: Add basic documentations Huacai Chen
2021-09-23 20:37   ` Pavel Machek
2021-09-24  4:07     ` Huacai Chen
2021-09-23 20:59   ` Pavel Machek
2021-09-24  4:10     ` Huacai Chen
2021-09-24  6:58       ` Pavel Machek
2021-09-24  7:31         ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 02/22] Documentation/zh_CN: Add basic LoongArch documentations Huacai Chen
2021-09-17  3:57 ` [PATCH V3 03/22] LoongArch: Add elf-related definitions Huacai Chen
2021-09-17  3:57 ` [PATCH V3 04/22] LoongArch: Add writecombine support for drm Huacai Chen
2021-09-17  3:57 ` [PATCH V3 05/22] LoongArch: Add build infrastructure Huacai Chen
2021-09-17  7:53   ` Arnd Bergmann
2021-09-18  4:35     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 06/22] LoongArch: Add CPU definition headers Huacai Chen
2021-09-17  3:57 ` [PATCH V3 07/22] LoongArch: Add atomic/locking headers Huacai Chen
2021-09-17  3:57 ` [PATCH V3 08/22] LoongArch: Add other common headers Huacai Chen
2021-09-17  3:57 ` [PATCH V3 09/22] LoongArch: Add boot and setup routines Huacai Chen
2021-09-17  8:11   ` Arnd Bergmann
2021-09-18  4:54     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 10/22] LoongArch: Add exception/interrupt handling Huacai Chen
2021-09-17  3:57 ` [PATCH V3 11/22] LoongArch: Add process management Huacai Chen
2021-09-17  3:57 ` [PATCH V3 12/22] LoongArch: Add memory management Huacai Chen
2021-09-17  3:57 ` [PATCH V3 13/22] LoongArch: Add system call support Huacai Chen
2021-09-17  8:24   ` Arnd Bergmann
2021-09-18  6:55     ` Huacai Chen [this message]
2021-09-17  3:57 ` [PATCH V3 14/22] LoongArch: Add signal handling support Huacai Chen
2021-09-17  8:26   ` Arnd Bergmann
2021-09-17 21:10   ` Eric W. Biederman
2021-09-18  7:12     ` Huacai Chen
2021-09-19  9:58       ` Arnd Bergmann
2021-09-20  2:36         ` Huacai Chen
2021-09-20 21:14           ` Richard Henderson
2021-09-22  2:43             ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 15/22] LoongArch: Add elf and module support Huacai Chen
2021-09-17  8:28   ` Arnd Bergmann
2021-09-18  7:14     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 16/22] LoongArch: Add misc common routines Huacai Chen
2021-09-17  6:10   ` Christoph Hellwig
2021-09-17  6:36     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 17/22] LoongArch: Add some library functions Huacai Chen
2021-09-17  8:33   ` Arnd Bergmann
2021-09-18  7:16     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 18/22] LoongArch: Add PCI controller support Huacai Chen
2021-09-17  9:02   ` Arnd Bergmann
2021-09-18  7:36     ` Huacai Chen
2021-09-21 22:36       ` Bjorn Helgaas
2021-09-22 15:33         ` Arnd Bergmann
2021-09-17  3:57 ` [PATCH V3 19/22] LoongArch: Add VDSO and VSYSCALL support Huacai Chen
2021-09-17  3:57 ` [PATCH V3 20/22] LoongArch: Add multi-processor (SMP) support Huacai Chen
2021-09-17  9:57   ` Arnd Bergmann
2021-09-18  7:22     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 21/22] LoongArch: Add Non-Uniform Memory Access (NUMA) support Huacai Chen
2021-09-17  6:15   ` Christoph Hellwig
2021-09-17  6:40     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 22/22] LoongArch: Add Loongson-3 default config file Huacai Chen
2021-09-17  9:59 ` [PATCH V3 00/22] arch: Add basic LoongArch support Arnd Bergmann

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