linux-kernel - Re: [PATCH 05/13] riscv: compat: syscall: Add compat_sys_call

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Message-ID: <CAJF2gTRG4wRTEb_YHuZo3Xg6gcShduD2WnbEM1M4wg1rVz4qng@mail.gmail.com>
Date:   Fri, 24 Dec 2021 17:42:31 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Anup Patel <anup.patel@....com>,
        gregkh <gregkh@...uxfoundation.org>,
        liush <liush@...winnertech.com>, Wei Fu <wefu@...hat.com>,
        Drew Fustini <drew@...gleboard.org>,
        Wang Junqiang <wangjunqiang@...as.ac.cn>,
        Wei Wu (吴伟) <lazyparser@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH 05/13] riscv: compat: syscall: Add compat_sys_call_table implementation

On Wed, Dec 22, 2021 at 10:00 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Wed, Dec 22, 2021 at 2:21 PM Arnd Bergmann <arnd@...db.de> wrote:
> > On Wed, Dec 22, 2021 at 1:43 PM Guo Ren <guoren@...nel.org> wrote:
> >
> > Right, I think the patch would be a nice cleanup, but it appears that
> > riscv is among the few architectures that have defined their own
> > nonstandard mmap2() syscall after all, despite using the standard
> > name for the entry point. Not sure how this slipped past my original
> > review, but it certainly can't be changed now.
>
> No, I misread, the calling conventions are fine after all, it's
> just written in a rather odd way.
>
> > Maybe leave it there and change the #ifdef to build mmap2 for both
> > native rv32 and compat mode.
>
> This bit still applies though, I don't think you need to add another
> helper, just use the one that is already there.
Yes, I will:

diff --git a/arch/riscv/kernel/sys_riscv.c b/arch/riscv/kernel/sys_riscv.c
index 12f8a7fce78b..9c0194f176fc 100644
--- a/arch/riscv/kernel/sys_riscv.c
+++ b/arch/riscv/kernel/sys_riscv.c
@@ -33,7 +33,9 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 {
        return riscv_sys_mmap(addr, len, prot, flags, fd, offset, 0);
 }
-#else
+#endif
+
+#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
        unsigned long, prot, unsigned long, flags,
        unsigned long, fd, off_t, offset)
@@ -44,7 +46,7 @@ SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned
long, len,
         */
        return riscv_sys_mmap(addr, len, prot, flags, fd, offset, 12);
 }
-#endif /* !CONFIG_64BIT */
+#endif

>
>         Arnd



-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/