From: Thomas Gleixner <tglx@linutronix.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Paul McKenney <paulmck@kernel.org>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Ard Biesheuvel <ardb@kernel.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Christoph Hellwig <hch@lst.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux-MM <linux-mm@kvack.org>,
the arch/x86 maintainers <x86@kernel.org>,
Vineet Gupta <vgupta@synopsys.com>,
"open list\:SYNOPSYS ARC ARCHITECTURE"
<linux-snps-arc@lists.infradead.org>,
Russell King <linux@armlinux.org.uk>,
Arnd Bergmann <arnd@arndb.de>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Guo Ren <guoren@kernel.org>,
linux-csky@vger.kernel.org, Michal Simek <monstr@monstr.eu>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
linux-mips@vger.kernel.org, Nick Hu <nickhu@andestech.com>,
Greentime Hu <green.hu@gmail.com>,
Vincent Chen <deanbo422@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
"David S. Miller" <davem@davemloft.net>,
linux-sparc <sparclinux@vger.kernel.org>,
Chris Zankel <chris@zankel.net>,
Max Filippov <jcmvbkbc@gmail.com>,
linux-xtensa@linux-xtensa.org,
Matthew Wilcox <willy@infradead.org>
Subject: Re: [patch V2 00/18] mm/highmem: Preemptible variant of kmap_atomic & friends
Date: Sat, 31 Oct 2020 00:53:02 +0100 [thread overview]
Message-ID: <87mu03l19d.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <87pn4zl2ia.fsf@nanos.tec.linutronix.de>
On Sat, Oct 31 2020 at 00:26, Thomas Gleixner wrote:
> On Fri, Oct 30 2020 at 15:46, Linus Torvalds wrote:
>> On Fri, Oct 30, 2020 at 3:26 PM Thomas Gleixner <tglx@linutronix.de> wrote:
>> To me, your patch series has two big advantages:
>>
>> - more common code
>>
>> - kmap_local() becomes more of a no-op
>>
>> and the last thing we want is to expand on kmap.
>
> Happy to go with that.
>
> While trying to document the mess, I just stumbled over the abuse of
> kmap_atomic_prot() in
>
> drivers/gpu/drm/ttm/ttm_bo_util.c: dst = kmap_atomic_prot(d, prot);
> drivers/gpu/drm/ttm/ttm_bo_util.c: src = kmap_atomic_prot(s, prot);
> drivers/gpu/drm/vmwgfx/vmwgfx_blit.c: kmap_atomic_prot(d->dst_pages[dst_page],
> drivers/gpu/drm/vmwgfx/vmwgfx_blit.c: kmap_atomic_prot(d->src_pages[src_page],
>
> For !HIGHMEM kmap_atomic_prot() just ignores the 'prot' argument and
> returns the page address.
>
> Moar patches to be written ... Sigh!
Or not. This is actually correct by some definition of correct. For
the non highmem case pgprot is set via the set_memory_*() functions and
this just handles the highmem case.
Comments are overrrated...
next prev parent reply other threads:[~2020-10-30 23:53 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-29 22:18 [patch V2 00/18] mm/highmem: Preemptible variant of kmap_atomic & friends Thomas Gleixner
2020-10-29 22:18 ` [patch V2 01/18] sched: Make migrate_disable/enable() independent of RT Thomas Gleixner
2020-10-29 22:18 ` [patch V2 02/18] mm/highmem: Un-EXPORT __kmap_atomic_idx() Thomas Gleixner
2020-10-29 22:18 ` [patch V2 03/18] highmem: Provide generic variant of kmap_atomic* Thomas Gleixner
2020-10-29 22:18 ` [patch V2 04/18] x86/mm/highmem: Use generic kmap atomic implementation Thomas Gleixner
2020-10-29 22:18 ` [patch V2 05/18] arc/mm/highmem: " Thomas Gleixner
2020-10-29 22:18 ` [patch V2 06/18] ARM: highmem: Switch to generic kmap atomic Thomas Gleixner
2020-10-29 22:18 ` [patch V2 07/18] csky/mm/highmem: " Thomas Gleixner
2020-10-29 22:18 ` [patch V2 08/18] microblaze/mm/highmem: " Thomas Gleixner
2020-10-29 22:18 ` [patch V2 09/18] mips/mm/highmem: " Thomas Gleixner
2020-10-29 22:18 ` [patch V2 10/18] nds32/mm/highmem: " Thomas Gleixner
2020-10-29 22:18 ` [patch V2 11/18] powerpc/mm/highmem: " Thomas Gleixner
2020-10-29 22:18 ` [patch V2 12/18] sparc/mm/highmem: " Thomas Gleixner
2020-10-29 22:18 ` [patch V2 13/18] xtensa/mm/highmem: " Thomas Gleixner
2020-10-29 22:18 ` [patch V2 14/18] mm/highmem: Remove the old kmap_atomic cruft Thomas Gleixner
2020-10-29 22:18 ` [patch V2 15/18] io-mapping: Cleanup atomic iomap Thomas Gleixner
2020-10-29 22:18 ` [patch V2 16/18] sched: highmem: Store local kmaps in task struct Thomas Gleixner
2020-10-29 22:18 ` [patch V2 17/18] mm/highmem: Provide kmap_local* Thomas Gleixner
2020-10-29 22:18 ` [patch V2 18/18] io-mapping: Provide iomap_local variant Thomas Gleixner
2020-10-29 23:11 ` [patch V2 00/18] mm/highmem: Preemptible variant of kmap_atomic & friends Linus Torvalds
2020-10-29 23:41 ` Thomas Gleixner
2020-10-30 9:39 ` Thomas Gleixner
2020-10-30 20:28 ` Linus Torvalds
2020-10-30 22:26 ` Thomas Gleixner
2020-10-30 22:46 ` Linus Torvalds
2020-10-30 23:26 ` Thomas Gleixner
2020-10-30 23:53 ` Thomas Gleixner [this message]
2020-10-31 13:37 ` Arnd Bergmann
2020-10-31 15:05 ` Christophe Leroy
2020-10-31 21:33 ` Arnd Bergmann
2020-10-30 7:25 ` Christoph Hellwig
2020-10-30 9:39 ` Thomas Gleixner
2020-10-30 13:06 ` Matthew Wilcox
2020-10-30 19:35 ` Thomas Gleixner
2020-11-02 1:08 ` Thomas Gleixner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87mu03l19d.fsf@nanos.tec.linutronix.de \
--to=tglx@linutronix.de \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=ardb@kernel.org \
--cc=arnd@arndb.de \
--cc=benh@kernel.crashing.org \
--cc=bigeasy@linutronix.de \
--cc=bristot@redhat.com \
--cc=bsegall@google.com \
--cc=chris@zankel.net \
--cc=daniel@ffwll.ch \
--cc=davem@davemloft.net \
--cc=deanbo422@gmail.com \
--cc=dietmar.eggemann@arm.com \
--cc=green.hu@gmail.com \
--cc=guoren@kernel.org \
--cc=hch@lst.de \
--cc=herbert@gondor.apana.org.au \
--cc=jcmvbkbc@gmail.com \
--cc=juri.lelli@redhat.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-csky@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-snps-arc@lists.infradead.org \
--cc=linux-xtensa@linux-xtensa.org \
--cc=linux@armlinux.org.uk \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mgorman@suse.de \
--cc=mingo@kernel.org \
--cc=monstr@monstr.eu \
--cc=mpe@ellerman.id.au \
--cc=nickhu@andestech.com \
--cc=paulmck@kernel.org \
--cc=paulus@samba.org \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=sparclinux@vger.kernel.org \
--cc=torvalds@linux-foundation.org \
--cc=tsbogend@alpha.franken.de \
--cc=vgupta@synopsys.com \
--cc=vincent.guittot@linaro.org \
--cc=willy@infradead.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).