linux-kernel - Re: [RFC PATCH] compat: update linux/compat.h and kernel/sys

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Message-ID: <07ad2ab8-ed96-21a6-8ace-e5f168712872@infradead.org>
Date:   Wed, 24 Aug 2022 17:36:45 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC PATCH] compat: update linux/compat.h and kernel/sys_ni.c



On 8/22/22 13:46, Andrew Morton wrote:
> On Mon, 22 Aug 2022 12:43:10 -0700 Randy Dunlap <rdunlap@...radead.org> wrote:
> 
>> Add conditional syscalls entries in kernel/sys_ni.c
>> for any syscalls that are arch- or config-dependent.
> 
> What is the reason for this?  What effects does it have?

Hi Andrew,

For <linux/compat.h> it's mostly a cleanup/completeness change,
as suggested by Arnd here:
  https://lore.kernel.org/lkml/CAK8P3a140FFhCvrOXbCtYKCW6BR6tEz6uy8Wqd0aG3DdHiZSXg@mail.gmail.com/


For kernel/sys_ni.c, it adds compat syscalls that are arch- or
config-dependent, to prevent the possibility of linker errors.

I have successfully built allnoconfig, defconfig, and allmodconfig for around 20
architectures with this patch applied.

-- 
~Randy