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From: Serge Semin <fancer.lancer@gmail.com>
To: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>,
	James Hogan <jhogan@kernel.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Bogendoerfer <tbogendoerfer@suse.de>,
	Huacai Chen <chenhc@lemote.com>, Stefan Agner <stefan@agner.ch>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Juergen Gross <jgross@suse.com>,
	Serge Semin <Sergey.Semin@t-platforms.ru>,
	"linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 3/5] mips: Print the kernel virtual mem layout on debugging
Date: Mon, 17 Jun 2019 16:39:30 +0300	[thread overview]
Message-ID: <20190617133929.uz7fweirm4a6oqnk@mobilestation> (raw)
In-Reply-To: <20190507233849.7z6kqfxitlnp2qtk@mobilestation>

Hello Paul

On Wed, May 08, 2019 at 02:38:49AM +0300, Serge Semin wrote:
> On Tue, May 07, 2019 at 10:41:10PM +0000, Paul Burton wrote:
> > Hi Serge,
> > 
> > On Wed, May 08, 2019 at 01:36:07AM +0300, Serge Semin wrote:
> > > Thanks for the report regarding this issue. I actually thought I
> > > tested the patch being buildable for 64bit systems. It turns out I
> > > didn't.(
> > 
> > Easily done :)
> > 
> > > Should I resend the fixed patch as a separate v3 one In-Reply-to this
> > > v2 patch or resubmit the patchset with cover-letter and only the fixed
> > > patch being there?
> > 
> > Replying with just v3 of this patch will be fine, no need to resend the
> > cover letter.
> > 
> 
> Ok. I've just submitted the v3 version with fixed buildability problem.
> 
> > I currently plan to submit a pull request for mips-next as-is, without
> > this patch, in the next day or two. There are a few last minute
> > submissions this time round that I'll then queue up & send a second pull
> > request next week, which this can be part of.
> > 
> > Thanks,
> >     Paul
> 
> Regarding this patch being part of the mips mm init code. I've just found out
> that 32-bit arm subsystem maintainers removed the same functionality from the
> kernel 5.1. This also was removed from arm64 in kernel 4.15:
> commit 1c31d4e96b8c ("ARM: 8820/1: mm: Stop printing the virtual memory layout")
> commit 071929dbdd86 ("arm64: Stop printing the virtual memory layout")
> 
> Maintainer of m68k and unicore32 discarded the printing as well:
> commit 1476ea250cf0 ("unicore32: stop printing the virtual memory layout")
> commit 31833332f798 ("m68k/mm: Stop printing the virtual memory layout")
> 
> The reasoning of these removal was that since commit ad67b74d2469 ("printk:
> hash addresses printed with %p") the kernel virtual addresses weren't
> printed to the system log anyway. So instead of replacing the format string with
> "%px" they decided not to leak a virtual memory layout information and completely
> removed the printing. I don't really know why they didn't closed the printing for
> debug kernel only as we did, since the info might be useful in this case.
> 
> Since I see a tendency of this functionality removal, we might need to
> reconsider this patch integration into the MIPS arch code. What do you think?
> 
> Although some architectures still perform the virtual memory layout printing
> at boot-time: x86_32, parisc, xtensa, sh, nds32 (might be others).
> 
> Cheers,
> -Sergey

So any update on this patch status?

Regards,
-Sergey

  reply	other threads:[~2019-06-17 13:39 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-03 17:50 [PATCH v2 0/5] mips: Post-bootmem-memblock transition fixes Serge Semin
2019-05-03 17:50 ` [PATCH v2 1/5] mips: Dump memblock regions for debugging Serge Semin
2019-05-06 19:11   ` Paul Burton
2019-05-03 17:50 ` [PATCH v2 2/5] mips: Perform early low memory test Serge Semin
2019-05-06 19:11   ` Paul Burton
2019-05-03 17:50 ` [PATCH v2 3/5] mips: Print the kernel virtual mem layout on debugging Serge Semin
2019-05-06 19:14   ` Paul Burton
2019-05-07 22:36     ` Serge Semin
2019-05-07 22:41       ` Paul Burton
2019-05-07 23:38         ` Serge Semin
2019-06-17 13:39           ` Serge Semin [this message]
2019-05-07 23:03   ` [PATCH v3] " Serge Semin
2019-05-03 17:50 ` [PATCH v2 4/5] mips: Make sure dt memory regions are valid Serge Semin
2019-05-06 19:12   ` Paul Burton
2019-05-03 17:50 ` [PATCH v2 5/5] mips: Manually call fdt_init_reserved_mem() method Serge Semin
2019-05-06 19:12   ` Paul Burton

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