linux-kernel - Re: [PATCH 3/4] symbol namespaces: revert to previous _

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Date:   Fri, 11 Oct 2019 15:24:47 +0100
From:   Will Deacon <will@...nel.org>
To:     Matthias Maennich <maennich@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Jessica Yu <jeyu@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Martijn Coenen <maco@...roid.com>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Shaun Ruffell <sruffell@...ffell.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kbuild@...r.kernel.org, linux-modules@...r.kernel.org
Subject: Re: [PATCH 3/4] symbol namespaces: revert to previous __ksymtab name
 scheme

On Thu, Oct 10, 2019 at 04:14:42PM +0100, Matthias Maennich wrote:
> The introduction Symbol Namespaces changed the naming schema of the

Missing "of" ?

> __ksymtab entries from __kysmtab__symbol to __ksymtab_NAMESPACE.symbol.
> 
> That caused some breakages in tools that depend on the name layout in
> either the binaries(vmlinux,*.ko) or in System.map. E.g. kmod's depmod
> would not be able to read System.map without a patch to support symbol
> namespaces. A warning reported by depmod for namespaced symbols would
> look like
> 
>   depmod: WARNING: [...]/uas.ko needs unknown symbol usb_stor_adjust_quirks
> 
> In order to address this issue, revert to the original naming scheme and
> rather read the __kstrtabns_<symbol> entries and their corresponding
> values from __ksymtab_strings to update the namespace values for
> symbols. After having read all symbols and handled them in
> handle_modversions(), the symbols are created. In a second pass, read
> the __kstrtabns_ entries and update the namespaces accordingly.
> 
> Suggested-by: Jessica Yu <jeyu@...nel.org>
> Fixes: 8651ec01daed ("module: add support for symbol namespaces.")
> Signed-off-by: Matthias Maennich <maennich@...gle.com>
> ---
>  include/linux/export.h | 13 +++++--------
>  scripts/mod/modpost.c  | 33 ++++++++++++++++++---------------
>  scripts/mod/modpost.h  |  1 +
>  3 files changed, 24 insertions(+), 23 deletions(-)

Patch looks fine, and it would be good to have this fixed in 5.4:

Acked-by: Will Deacon <will@...nel.org>

Will