linux-kernel - Re: [PATCH 1/2] RISC-V: Request stat64 on RV32

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Message-ID: <CA+ZOyahQ-6biJazXCYr539-rCQHuJOz6QFuVB_Jv5EpfYuPrwg@mail.gmail.com>
Date:   Mon, 12 Nov 2018 16:29:17 +0800
From:   Zong Li <zongbox@...il.com>
To:     david.abdurachmanov@...il.com
Cc:     Palmer Dabbelt <palmer@...ive.com>, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Zong Li <zong@...estech.com>, marcin.juszkiewicz@...aro.org,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/2] RISC-V: Request stat64 on RV32

David Abdurachmanov <david.abdurachmanov@...il.com> 於 2018年11月12日 週一 下午2:19寫道：
>
> On Mon, Nov 12, 2018 at 5:10 AM Zong Li <zongbox@...il.com> wrote:
> >
> > The stat64 family that is used on 32-bit architectures to replace
> > newstat.
> >
> > Since commit 67314ec7b0250290cc85eaa7a2f88a8ddb9e8547 ("RISC-V: Request
> > newstat syscalls"), the RV32 build fail with undeclared 'sys_fstatat64'
> >
> > Signed-off-by: Zong Li <zong@...estech.com>
> > ---
> >  arch/riscv/include/asm/unistd.h | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/riscv/include/asm/unistd.h b/arch/riscv/include/asm/unistd.h
> > index eff7aa9..a4aade9 100644
> > --- a/arch/riscv/include/asm/unistd.h
> > +++ b/arch/riscv/include/asm/unistd.h
> > @@ -18,5 +18,6 @@
> >
> >  #define __ARCH_WANT_NEW_STAT
> >  #define __ARCH_WANT_SYS_CLONE
> > +#define __ARCH_WANT_STAT64
> >  #include <uapi/asm/unistd.h>
> >  #include <uapi/asm/syscalls.h>
> > --
>
> See: http://lists.infradead.org/pipermail/linux-riscv/2018-November/002087.html
>
> The plan is not to have old stat syscalls and support statx on
> riscv32, which is y2038 safe.
>
> The issue you see is a bug in include/uapi/asm-generic/unistd.h.
> Marcin (CC) already sent a patch to Arnd (CC) IIRC. Basically without
> __ARCH_WANT_NEW_STAT or __ARCH_WANT_STAT64 two macros are not defined:
> __NR3264_fstatat and __NR3264_fstat. Which is later used (without any
> guards):
>
> 763 #define __NR_newfstatat __NR3264_fstatat
> 764 #define __NR_fstat __NR3264_fstat

Nice. Thank you.