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From: Daniel Thompson <daniel.thompson@linaro.org>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Luis Chamberlain <mcgrof@kernel.org>,
	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>,
	Jason Wessel <jason.wessel@windriver.com>,
	Douglas Anderson <dianders@chromium.org>
Subject: Re: [PATCH v2 4/5] modules: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
Date: Fri, 28 Jan 2022 14:09:47 +0000	[thread overview]
Message-ID: <20220128140947.n2xea77txqohfbfj@maple.lan> (raw)
In-Reply-To: <af8519537d2a5c36b71a2f48ba9b81c07c93a5c4.1643282353.git.christophe.leroy@csgroup.eu>

On Thu, Jan 27, 2022 at 11:28:09AM +0000, Christophe Leroy wrote:
> Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC to 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.
> 
> 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.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> Cc: Jason Wessel <jason.wessel@windriver.com>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Douglas Anderson <dianders@chromium.org>

Thanks for diligence in making sure kdb is up to date!

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>


Daniel.

WARNING: multiple messages have this Message-ID (diff)
From: Daniel Thompson <daniel.thompson@linaro.org>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
	"kgdb-bugreport@lists.sourceforge.net"
	<kgdb-bugreport@lists.sourceforge.net>,
	Jason Wessel <jason.wessel@windriver.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Douglas Anderson <dianders@chromium.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Jessica Yu <jeyu@kernel.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH v2 4/5] modules: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
Date: Fri, 28 Jan 2022 14:09:47 +0000	[thread overview]
Message-ID: <20220128140947.n2xea77txqohfbfj@maple.lan> (raw)
In-Reply-To: <af8519537d2a5c36b71a2f48ba9b81c07c93a5c4.1643282353.git.christophe.leroy@csgroup.eu>

On Thu, Jan 27, 2022 at 11:28:09AM +0000, Christophe Leroy wrote:
> Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC to 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.
> 
> 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.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> Cc: Jason Wessel <jason.wessel@windriver.com>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Douglas Anderson <dianders@chromium.org>

Thanks for diligence in making sure kdb is up to date!

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>


Daniel.

  reply	other threads:[~2022-01-28 14:09 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-27 11:27 [PATCH v2 0/5] Allocate module text and data separately Christophe Leroy
2022-01-27 11:27 ` Christophe Leroy
2022-01-27 11:27 ` [PATCH v2 1/5] modules: Always have struct mod_tree_root Christophe Leroy
2022-01-27 11:27   ` Christophe Leroy
2022-01-27 11:28 ` [PATCH v2 2/5] modules: Prepare for handling several RB trees Christophe Leroy
2022-01-27 11:28   ` Christophe Leroy
2022-01-27 11:28 ` [PATCH v2 3/5] modules: Introduce data_layout Christophe Leroy
2022-01-27 11:28   ` Christophe Leroy
2022-01-27 11:28 ` [PATCH v2 4/5] modules: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC Christophe Leroy
2022-01-27 11:28   ` Christophe Leroy
2022-01-28 14:09   ` Daniel Thompson [this message]
2022-01-28 14:09     ` Daniel Thompson
2022-01-27 11:28 ` [PATCH v2 5/5] powerpc: Select ARCH_WANTS_MODULES_DATA_IN_VMALLOC on book3s/32 and 8xx Christophe Leroy
2022-01-27 11:28   ` Christophe Leroy
2022-02-02 23:36   ` Luis Chamberlain
2022-02-02 23:36     ` Luis Chamberlain
2022-02-03  5:39     ` Michael Ellerman
2022-02-03  5:39       ` Michael Ellerman
2022-02-03  7:07       ` Christophe Leroy
2022-02-03  7:07         ` Christophe Leroy
2022-02-07  1:19         ` Michael Ellerman
2022-02-07  1:19           ` Michael Ellerman
2022-02-09 15:42 ` [PATCH v2 0/5] Allocate module text and data separately Miroslav Benes
2022-02-09 15:42   ` Miroslav Benes

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