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From: Luis Chamberlain <mcgrof@kernel.org>
To: Christophe Leroy <christophe.leroy@csgroup.eu>,
	Aaron Tomlin <atomlin@redhat.com>
Cc: Jessica Yu <jeyu@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"kgdb-bugreport@lists.sourceforge.net"
	<kgdb-bugreport@lists.sourceforge.net>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>
Subject: Re: [PATCH v3 0/6] Allocate module text and data separately
Date: Wed, 2 Feb 2022 16:05:31 -0800	[thread overview]
Message-ID: <YfscSzltd4UcZSCO@bombadil.infradead.org> (raw)
In-Reply-To: <cover.1643475473.git.christophe.leroy@csgroup.eu>

On Sat, Jan 29, 2022 at 05:02:03PM +0000, Christophe Leroy wrote:
> This series allow architectures to request having modules data in
> vmalloc area instead of module area.
> 
> This is required on powerpc book3s/32 in order to set data non
> executable, because it is not possible to set executability on page
> basis, this is done per 256 Mbytes segments. The module area has exec
> right, vmalloc area has noexec. Without this change module data
> remains executable regardless of CONFIG_STRICT_MODULES_RWX.
> 
> This can also be useful on other powerpc/32 in order to maximize the
> chance of code being close enough to kernel core to avoid branch
> trampolines.
> 

This looks good, however I'd like to see Aaron's changes go in first,
and then yours. Aaron's changes still need to be tested by 0-day and I
need to finish review, but that's the order of how I'd prefer to see
changes merged / tested. I'll try to review his changes, dump them to
modules-next and then I'd like to trouble you to rebase ontop of that.

We should get all this tested early for the next release.

  Luis


      parent reply	other threads:[~2022-02-03  0:05 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-29 17:02 Christophe Leroy
2022-01-29 17:02 ` [PATCH v3 1/6] modules: Always have struct mod_tree_root Christophe Leroy
2022-01-29 17:02 ` [PATCH v3 2/6] modules: Prepare for handling several RB trees Christophe Leroy
2022-01-29 17:02 ` [PATCH v3 3/6] modules: Introduce data_layout Christophe Leroy
2022-02-02 23:48   ` Luis Chamberlain
2022-02-03  6:58     ` Christophe Leroy
2022-01-29 17:02 ` [PATCH v3 4/6] modules: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC Christophe Leroy
2022-02-03  0:01   ` Luis Chamberlain
2022-02-03  7:05     ` Christophe Leroy
2022-02-03 19:51       ` Luis Chamberlain
2022-02-08 18:40         ` Michal Suchánek
2022-01-29 17:02 ` [PATCH v3 5/6] modules: Remove module_addr_min and module_addr_max Christophe Leroy
2022-01-29 17:02 ` [PATCH v3 6/6] powerpc: Select ARCH_WANTS_MODULES_DATA_IN_VMALLOC on book3s/32 and 8xx Christophe Leroy
2022-02-03  0:05 ` Luis Chamberlain [this message]

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