linux-kernel - Re: [PATCH 2/2] mtd: rawnand: use unnamed union in struct nand_op_parser_pattern

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Date:   Tue, 22 Jan 2019 08:49:44 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        Stefan Agner <stefan@...er.ch>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        linux-tegra@...r.kernel.org,
        Boris Brezillon <bbrezillon@...nel.org>,
        Lucas Stach <dev@...xeye.de>
Subject: Re: [PATCH 2/2] mtd: rawnand: use unnamed union in struct
 nand_op_parser_pattern_elem

Hi Masahiro,

Masahiro Yamada <yamada.masahiro@...ionext.com> wrote on Tue, 22 Jan
2019 16:42:55 +0900:

> Although drivers do not directly get access to the private data of
> instruction patterns, let's use unnamed union field to be consistent
> with nand_op_instr.
> 

Actually this is how we wrote it the first time. Then we got robots
reporting that anonymous unions where not allowed with older (still
supported) GCC versions and I had to do this:


commit c1a72e2dbb4abb90bd408480d7c48ba40cb799ce
Author: Miquel Raynal <miquel.raynal@...e-electrons.com>
Date:   Fri Jan 19 19:11:27 2018 +0100

    mtd: nand: Fix build issues due to an anonymous union
    
    GCC-4.4.4 raises errors when assigning a parameter in an anonymous
    union, leading to this kind of failure:
    
    drivers/mtd/nand/marvell_nand.c:1936:
        warning: missing braces around initializer
        warning: (near initialization for '(anonymous)[1].<anonymous>')
        error: unknown field 'data' specified in initializer
        error: unknown field 'addr' specified in initializer
    
    Work around the situation by naming these unions.
    
    Fixes: 8878b126df76 ("mtd: nand: add ->exec_op() implementation")
    Reported-by: Andrew Morton <akpm@...ux-foundation.org>
    Signed-off-by: Miquel Raynal <miquel.raynal@...e-electrons.com>
    Tested-by: Andrew Morton <akpm@...ux-foundation.org>
    Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>


Thanks,
Miquèl