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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Matthias Maennich <maennich@google.com>
Cc: linux-kernel@vger.kernel.org, kernel-team@android.com,
	Jessica Yu <jeyu@kernel.org>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Martijn Coenen <maco@android.com>,
	Lucas De Marchi <lucas.de.marchi@gmail.com>,
	Shaun Ruffell <sruffell@sruffell.net>,
	Will Deacon <will@kernel.org>,
	linux-kbuild@vger.kernel.org, linux-modules@vger.kernel.org
Subject: Re: [PATCH 4/4] export: avoid code duplication in include/linux/export.h
Date: Fri, 11 Oct 2019 17:31:27 +0200
Message-ID: <20191011153127.GA1283883@kroah.com> (raw)
In-Reply-To: <20191010151443.7399-5-maennich@google.com>

On Thu, Oct 10, 2019 at 04:14:43PM +0100, Matthias Maennich wrote:
> Now that the namespace value is not part of the __ksymtab entry name
> anymore, we can simplify the implementation of EXPORT_SYMBOL*. By
> allowing the empty string "" to represent 'no namespace', we can unify
> the implementation and drop a lot redundant code.  That increases
> readability and maintainability.
> 
> As Masahiro pointed out earlier,
> "The drawback of this change is, it grows the code size. When the symbol
> has no namespace, sym->namespace was previously NULL, but it is now am
> empty string "". So, it increases 1 byte for every no namespace
> EXPORT_SYMBOL. A typical kernel configuration has 10K exported symbols,
> so it increases 10KB in rough estimation."

10Kb of non-swapable memory isn't good.  But if you care about that, you
can get it back with the option to compile away any non-used symbols,
and that shouldn't be affected by this change, right?

That being said, the code is a lot cleaner, so I have no objection to
it.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10 15:14 [PATCH 0/4] export/modpost: avoid renaming __ksymtab entries for symbol namespaces Matthias Maennich
2019-10-10 15:14 ` [PATCH 1/4] modpost: delegate updating namespaces to separate function Matthias Maennich
2019-10-11 14:24   ` Will Deacon
2019-10-11 15:32   ` Greg Kroah-Hartman
2019-10-12  3:19     ` Masahiro Yamada
2019-10-10 15:14 ` [PATCH 2/4] modpost: make updating the symbol namespace explict Matthias Maennich
2019-10-11 14:24   ` Will Deacon
2019-10-11 15:33   ` Greg Kroah-Hartman
2019-10-12  3:22   ` Masahiro Yamada
2019-10-10 15:14 ` [PATCH 3/4] symbol namespaces: revert to previous __ksymtab name scheme Matthias Maennich
2019-10-11 14:24   ` Will Deacon
2019-10-11 15:33   ` Greg Kroah-Hartman
2019-10-12  3:35   ` Masahiro Yamada
2019-10-10 15:14 ` [PATCH 4/4] export: avoid code duplication in include/linux/export.h Matthias Maennich
2019-10-11 15:31   ` Greg Kroah-Hartman [this message]
2019-10-11 15:43     ` Matthias Maennich
2019-10-12  4:25       ` Masahiro Yamada
2019-10-18  9:31 ` [PATCH v2 0/4] export/modpost: avoid renaming __ksymtab entries for symbol namespaces Matthias Maennich
2019-10-18  9:31   ` [PATCH v2 1/4] modpost: delegate updating namespaces to separate function Matthias Maennich
2019-10-18  9:31   ` [PATCH v2 2/4] modpost: make updating the symbol namespace explicit Matthias Maennich
2019-10-18  9:31   ` [PATCH v2 3/4] symbol namespaces: revert to previous __ksymtab name scheme Matthias Maennich
2019-10-18  9:31   ` [PATCH v2 4/4] export: avoid code duplication in include/linux/export.h Matthias Maennich

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