linux-kernel - Re: [PATCH v3] zram: don't free statically defined names

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Message-ID: <20240924065056.GP38742@google.com>
Date: Tue, 24 Sep 2024 15:50:56 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Andrey Skvortsov <andrej.skvortzov@...il.com>,
	Venkat Rao Bagalkote <venkat88@...ux.vnet.ibm.com>,
	Minchan Kim <minchan@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	stable@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH v3] zram: don't free statically defined names

On (24/09/24 14:49), Sergey Senozhatsky wrote:
> On (24/09/24 07:21), Christophe JAILLET wrote:
> [..]
> > > kfree_const() will not work if zram is built as a module. It works
> > > only for .rodata for kernel image. [1]
> > > 
> > > 1. https://elixir.bootlin.com/linux/v6.11/source/include/asm-generic/sections.h#L177
> > > 
> > 
> > If so, then it is likely that it is not correctly used elsewhere.
> > 
> > https://elixir.bootlin.com/linux/v6.11/source/drivers/dax/kmem.c#L289
> > https://elixir.bootlin.com/linux/v6.11/source/drivers/firmware/arm_scmi/bus.c#L341
> > https://elixir.bootlin.com/linux/v6.11/source/drivers/input/touchscreen/chipone_icn8505.c#L379

OK there are too many users of kfree_const() in drivers/ so
un-exporting it is not an option, that was a silly idea.  We
probably need to walk through them and make sure that they
don't kfree_const() modules' .rodata