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Date:   Fri, 25 Feb 2022 16:49:46 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Guo Ren <guoren@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Palmer Dabbelt <palmer@...belt.com>,
        Anup Patel <anup@...infault.org>,
        gregkh <gregkh@...uxfoundation.org>,
        liush <liush@...winnertech.com>, Wei Fu <wefu@...hat.com>,
        Drew Fustini <drew@...gleboard.org>,
        Wang Junqiang <wangjunqiang@...as.ac.cn>,
        Christoph Hellwig <hch@....de>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V6 16/20] riscv: compat: vdso: Add rv32 VDSO base code implementation

On Fri, Feb 25, 2022 at 4:42 PM Guo Ren <guoren@...nel.org> wrote:
>
> Hi Arnd & Palmer,
>
> Here is the new modified compat_vdso/Makefile, please have a look,
> first. Then I would update it to v7:
> ===========================================
> # SPDX-License-Identifier: GPL-2.0-only
> #
> # Makefile for compat_vdso
> #
>
> # Symbols present in the compat_vdso
> compat_vdso-syms  = rt_sigreturn
> compat_vdso-syms += getcpu
> compat_vdso-syms += flush_icache
>
> ifdef CROSS_COMPILE_COMPAT
>         COMPAT_CC := $(CROSS_COMPILE_COMPAT)gcc
>         COMPAT_LD := $(CROSS_COMPILE_COMPAT)ld
> else
>         COMPAT_CC := $(CC)
>         COMPAT_LD := $(LD)
> endif
>
> COMPAT_CC_FLAGS := -march=rv32g -mabi=ilp32
> COMPAT_LD_FLAGS := -melf32lriscv

Have you come across a case in which a separate cross toolchain
is required? If not, I would leave this out and just set the flags for the
normal toolchain.

I also think it would be a nicer split to build the two vdso variants
as vdso64/vdso32 rather than vdso/compat_vdso. That way,
the build procedure can be kept as close as possible to the
native 32-bit build.

        Arnd

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