From: Willy Tarreau <w@1wt.eu>
To: Christoph Hellwig <hch@infradead.org>
Cc: Denis Efremov <efremov@linux.com>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Helge Deller <deller@gmx.de>, Ian Molton <spyro@f2s.com>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Matt Turner <mattst88@gmail.com>,
Richard Henderson <rth@twiddle.net>,
Russell King <linux@armlinux.org.uk>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
x86@kernel.org
Subject: Re: [PATCH 00/23] Floppy driver cleanups
Date: Tue, 31 Mar 2020 17:49:08 +0200 [thread overview]
Message-ID: <20200331154908.GB24854@1wt.eu> (raw)
In-Reply-To: <20200331152812.GA16100@infradead.org>
On Tue, Mar 31, 2020 at 08:28:12AM -0700, Christoph Hellwig wrote:
> On Tue, Mar 31, 2020 at 01:01:36PM +0200, Willy Tarreau wrote:
> > I'm not sure what this implies regarding this code, to be honest. It's
> > very tricky and implements sort of a state machine using function pointers
> > within its interrupt handler so you never know exactly what accesses what,
> > and quite a part of it remains obscure to me :-/ I can accept to help, I
> > can even run tests since I still have running hardware, but I'd at least
> > need some guidance. And probably Denis would know better than me there.
> > Also I doubt we'd get sufficient testing on less common archs. While I
> > do have sparc64/parisc/alpha available, I haven't booted a recent kernel
> > on any of them for a while (2.4 used to be the last ones), and I'm not
> > sure it's reasonable to go into such changes without proper testing.
>
> The basic change is that instead of using bio_data() or page_address
> all pages coming from the block layer need to be properly kmap()ed.
> I'll try to cook something up an will send it to Denis and you for
> review and testing. The code things about sparc64/parisc/alpha is
> that they all don't have highmem, so these changes should be effective
> no-ops for them.
OK, thanks for the explanation!
Willy
next prev parent reply other threads:[~2020-03-31 15:50 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-31 9:40 [PATCH 00/23] Floppy driver cleanups Willy Tarreau
2020-03-31 9:40 ` [PATCH 01/23] floppy: split the base port from the register in I/O accesses Willy Tarreau
2020-03-31 9:40 ` [PATCH 02/23] floppy: add references to 82077's extra registers Willy Tarreau
2020-03-31 9:40 ` [PATCH 03/23] floppy: use symbolic register names in the m68k port Willy Tarreau
2020-03-31 9:40 ` [PATCH 04/23] floppy: use symbolic register names in the parisc port Willy Tarreau
2020-03-31 9:40 ` [PATCH 05/23] floppy: use symbolic register names in the powerpc port Willy Tarreau
2020-03-31 9:40 ` [PATCH 06/23] floppy: use symbolic register names in the sparc32 port Willy Tarreau
2020-03-31 9:40 ` [PATCH 07/23] floppy: use symbolic register names in the sparc64 port Willy Tarreau
2020-04-14 9:20 ` Denis Efremov
2020-03-31 9:40 ` [PATCH 08/23] floppy: use symbolic register names in the x86 port Willy Tarreau
2020-03-31 9:40 ` [PATCH 09/23] floppy: cleanup: make twaddle() not rely on current_{fdc,drive} anymore Willy Tarreau
2020-03-31 9:40 ` [PATCH 10/23] floppy: cleanup: make reset_fdc_info() not rely on current_fdc anymore Willy Tarreau
2020-03-31 9:40 ` [PATCH 11/23] floppy: cleanup: make show_floppy() " Willy Tarreau
2020-03-31 9:40 ` [PATCH 12/23] floppy: cleanup: make wait_til_ready() " Willy Tarreau
2020-03-31 9:40 ` [PATCH 13/23] floppy: cleanup: make output_byte() " Willy Tarreau
2020-03-31 9:40 ` [PATCH 14/23] floppy: cleanup: make result() " Willy Tarreau
2020-03-31 9:40 ` [PATCH 15/23] floppy: cleanup: make need_more_output() " Willy Tarreau
2020-03-31 9:40 ` [PATCH 16/23] floppy: cleanup: make perpendicular_mode() " Willy Tarreau
2020-03-31 9:40 ` [PATCH 17/23] floppy: cleanup: make fdc_configure() " Willy Tarreau
2020-03-31 9:40 ` [PATCH 18/23] floppy: cleanup: make fdc_specify() not rely on current_{fdc,drive} anymore Willy Tarreau
2020-03-31 9:40 ` [PATCH 19/23] floppy: cleanup: make check_wp() " Willy Tarreau
2020-03-31 9:40 ` [PATCH 20/23] floppy: cleanup: make next_valid_format() not rely on current_drive anymore Willy Tarreau
2020-03-31 9:40 ` [PATCH 21/23] floppy: cleanup: make get_fdc_version() not rely on current_fdc anymore Willy Tarreau
2020-03-31 9:40 ` [PATCH 22/23] floppy: cleanup: do not iterate on current_fdc in DMA grab/release functions Willy Tarreau
2020-04-10 8:35 ` Denis Efremov
2020-04-10 8:45 ` Willy Tarreau
2020-04-10 8:48 ` Denis Efremov
2020-04-10 9:32 ` Willy Tarreau
2020-04-10 9:30 ` [PATCH 24/23] floppy: cleanup: do not iterate on current_fdc in do_floppy_init() Willy Tarreau
2020-04-10 10:19 ` [PATCH 25/23] floppy: make sure to reset all FDCs upon resume() Willy Tarreau
2020-04-10 10:19 ` [PATCH 26/23] floppy: cleanup: get rid of current_reqD in favor of current_drive Willy Tarreau
2020-04-10 10:19 ` [PATCH 27/23] floppy: cleanup: make set_fdc() always set current_drive and current_fd Willy Tarreau
2020-03-31 9:40 ` [PATCH 23/23] floppy: cleanup: add a few comments about expectations in certain functions Willy Tarreau
2020-03-31 10:10 ` [PATCH 00/23] Floppy driver cleanups Christoph Hellwig
2020-03-31 11:01 ` Willy Tarreau
2020-03-31 15:28 ` Christoph Hellwig
2020-03-31 15:49 ` Willy Tarreau [this message]
2020-04-13 22:46 ` Jens Axboe
2020-04-14 5:31 ` Willy Tarreau
2020-04-14 10:29 ` Denis Efremov
2020-04-14 16:12 ` Willy Tarreau
2020-04-21 13:15 ` Denis Efremov
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