linux-kernel - Re: [PATCH V2 00/11] Subject: Remove duplicated kmap code

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Date:   Mon, 4 May 2020 02:35:09 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     ira.weiny@...el.com
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH V2 00/11] Subject: Remove duplicated kmap code

On Sun, May 03, 2020 at 06:09:01PM -0700, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The kmap infrastructure has been copied almost verbatim to every architecture.
> This series consolidates obvious duplicated code by defining core functions
> which call into the architectures only when needed.
> 
> Some of the k[un]map_atomic() implementations have some similarities but the
> similarities were not sufficient to warrant further changes.
> 
> In addition we remove a duplicate implementation of kmap() in DRM.
> 
> Testing was done by 0day to cover all the architectures I can't readily
> build/test.

OK...  Looking through my old notes on kmap unification (this winter, never
went anywhere),

* arch/mips/mm/cache.c ought to use linux/highmem.h, not asm/highmem.h
I suspect that your series doesn't build on some configs there.  Hadn't
verified that, though.

* kmap_atomic_to_page() is dead, but not quite gone - csky and nds32 brought
the damn thing back (nds32 - only an extern).  It needs killin'...

* parisc is (arguably) abusing kunmap()/kunmap_atomic() for cache flushing.
Replace the bulk of its highmem.h with
#define ARCH_HAS_FLUSH_ON_KUNMAP
#define arch_before_kunmap flush_kernel_dcache_page_addr
and have default kunmap()/kunmap_atomic() do
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
	arch_before_kunmap(page_address(page));
#endif
and
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
	arch_before_kunmap(addr);
#endif
resp.  Kills ARCH_HAS_KMAP along with ifdefs on it, makes parisc use somewhat
less hacky.

I'd suggest checking various configs on mips - that's likely to cause headache.
Said that, my analysis of include chains back then is pretty much worthless
by now - I really hate the amount of indirect include chains leading to that
sucker on some, but not all configs ;-/  IIRC, the proof that everything
using kmap*/kunmap* would pull linux/highmem.h regardless of config took several
hours of digging, ran for several pages and had been hopelessly brittle.
arch/mips/mm/cache.c was the only exception caught by it, but these days
there might be more.