linux-kernel - Re: [PATCH v2] MIPS: Add support for CONFIG_DEBUG

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Date:   Thu, 25 Mar 2021 10:57:39 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-mips@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Liangliang Huang <huanglllzu@...il.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Kees Cook <keescook@...omium.org>,
        Jinyang He <hejinyang@...ngson.cn>,
        Vlastimil Babka <vbabka@...e.cz>,
        Yousong Zhou <yszhou4tech@...il.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Michel Lespinasse <walken@...gle.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] MIPS: Add support for CONFIG_DEBUG_VIRTUAL

On Tue, Mar 23, 2021 at 03:20:43PM -0700, Florian Fainelli wrote:
> Provide hooks to intercept bad usages of virt_to_phys() and
> __pa_symbol() throughout the kernel. To make this possible, we need to
> rename the current implement of virt_to_phys() into
> __virt_to_phys_nodebug() and wrap it around depending on
> CONFIG_DEBUG_VIRTUAL.
> 
> A similar thing is needed for __pa_symbol() which is now aliased to
> __phys_addr_symbol() whose implementation is either the direct return of
> RELOC_HIDE or goes through the debug version.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> Changes in v2:
> - fixed sparse warning in arch/mips/kernel/vdso.c

checkpatch warns about a missing SPDX license in arch/mips/mm/physaddr.c,
can you please add one ?

And as checkpatch is also unhappy about the volatiles, do we really
need them here ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]