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From: Jessica Yu <jeyu@kernel.org>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
	Matthias Maennich <maennich@google.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Joel Fernandes <joel@joelfernandes.org>,
	Martijn Coenen <maco@android.com>,
	Will Deacon <will.deacon@arm.com>, Will Deacon <will@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/7] module: avoid code duplication in include/linux/export.h
Date: Thu, 31 Oct 2019 12:26:03 +0100	[thread overview]
Message-ID: <20191031112602.GD2177@linux-8ccs> (raw)
In-Reply-To: <8eb4f2fd-f34f-606d-8e7d-4b6b6fb86edc@rasmusvillemoes.dk>

+++ Rasmus Villemoes [31/10/19 12:03 +0100]:
>On 31/10/2019 11.13, Jessica Yu wrote:
>> +++ Rasmus Villemoes [29/10/19 22:11 +0100]:
>>> On 29/10/2019 20.19, Jessica Yu wrote:
>
>>>> Apparently ld does not do the deduplication for SHF_MERGE|SHF_STRINGS
>>>> sections for relocatable files (ld -r), which kernel modules are. See:
>>>>
>>>>    https://sourceware.org/ml/binutils/2009-07/msg00291.html
>>>
>>> I know <https://patches-gcc.linaro.org/patch/5858/> :)
>>
>> That is exactly what we need! :)
>>
>>>> But, the strings do get deduplicated for vmlinux. Not sure if we can
>>>> find a workaround for modules or if the benefit is significant enough
>>>> if it only for vmlinux.
>>>
>>> I think it's definitely worth if, even if it "only" benefits vmlinux for
>>> now. And I still hope to revisit the --force-section-merge some day, but
>>> it's very far down my priority list.
>>
>> Yeah, I think it's worth having too.
>>
>> If you don't have any extra cycles at the moment, and it's far down
>> your priority list, do you mind if I take a look and maybe try to push
>> that patch of yours upstream again?
>
>Knock yourself out :) IIRC, it did actually work for the powerpc I was
>targeting, but I don't remember if that was just "readelf/objdump
>inspection of the ELF files looks reasonable" or if I actually tried
>loading the modules. I've pushed the patch to
>https://github.com/Villemoes/binutils-gdb/commit/107b9302858fc5fc1a1690f4a36e1f80808ab421
>so you don't have to copy-paste from a browser.

Thanks a bunch!

>I don't know how successful I'd
>> be, but now since it's especially relevant for namespaces, it's
>> definitely worth looking at again.
>
>Yeah, but even ignoring namespaces, it would be nice to have format
>strings etc. deduplicated. Please keep me cc'ed on any progress you make.

Thanks, I'll keep you posted if I manage to get somewhere with it :)


  reply	other threads:[~2019-10-31 11:26 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-27  9:35 [PATCH 0/7] module: various bug-fixes and clean-ups for module namespace Masahiro Yamada
2019-09-27  9:35 ` [PATCH 1/7] modpost: fix broken sym->namespace for external module builds Masahiro Yamada
2019-09-27  9:56   ` Masahiro Yamada
2019-09-27 11:46   ` Matthias Maennich
2019-09-27  9:35 ` [PATCH 2/7] module: swap the order of symbol.namespace Masahiro Yamada
2019-09-27 12:07   ` Matthias Maennich
2019-09-27  9:35 ` [PATCH 3/7] module: rename __kstrtab_ns_* to __kstrtabns_* to avoid symbol conflict Masahiro Yamada
2019-09-27 12:14   ` Matthias Maennich
2019-09-27  9:36 ` [PATCH 4/7] module: avoid code duplication in include/linux/export.h Masahiro Yamada
2019-09-27  9:58   ` Masahiro Yamada
2019-09-27 11:07   ` Rasmus Villemoes
2019-09-27 12:36     ` Matthias Maennich
2019-10-29 19:19     ` Jessica Yu
2019-10-29 21:11       ` Rasmus Villemoes
2019-10-31 10:13         ` Jessica Yu
2019-10-31 11:03           ` Rasmus Villemoes
2019-10-31 11:26             ` Jessica Yu [this message]
2019-09-27  9:36 ` [PATCH 5/7] kbuild: fix build error of 'make nsdeps' in clean tree Masahiro Yamada
2019-09-27 12:44   ` Matthias Maennich
2019-09-27  9:36 ` [PATCH 6/7] nsdeps: fix hashbang of scripts/nsdeps Masahiro Yamada
2019-09-27 13:10   ` Matthias Maennich
2019-09-27  9:36 ` [PATCH 7/7] nsdeps: make generated patches independent of locale Masahiro Yamada
2019-09-27 13:27   ` Matthias Maennich
2019-09-27 15:42     ` Masahiro Yamada
2019-09-27 18:14       ` Greg Kroah-Hartman
2019-09-29  1:18         ` Masahiro Yamada
2019-09-29  1:30           ` Masahiro Yamada
2019-10-01 11:46             ` Matthias Maennich
2019-09-29 10:14           ` Greg Kroah-Hartman
2019-09-27 13:41 ` [PATCH 0/7] module: various bug-fixes and clean-ups for module namespace Matthias Maennich
2019-09-27 15:43   ` Masahiro Yamada
2019-10-02 18:57   ` Jessica Yu
2019-10-02 20:43     ` Matthias Maennich
2019-10-03  1:26     ` Masahiro Yamada
2019-10-03  8:03     ` Masahiro Yamada

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