linux-kernel - Re: [PATCH] NoMoreModuleVmalloc - Try alloc_pages_exact before vmalloc, if fails do vmalloc

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Date:	Tue, 15 Jul 2014 21:04:17 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Lucas Tanure <tanure@...ux.com>
Cc:	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NoMoreModuleVmalloc - Try alloc_pages_exact before vmalloc, if fails do vmalloc

Lucas Tanure <tanure@...ux.com> writes:
> Hi Russell,
>
> I found that project
> http://kernelnewbies.org/KernelProjects/NoMoreModuleVmalloc.
> So I thought that doing first a alloc_pages_exact would be the goal.
> The kernel/module.c doesn't need this task any more, or I just did in
> the wrong way ?

Hmm, that's hardly a newbie project!

arch/x86/kernel/module.c contains the module_alloc() code for x86.
You'd need to repalce that, and set module_free() too.

And it's not entirely clear that replacing it with kmalloc is actually
useful, since it will break CONFIG_DEBUG_SET_MODULE_RONX=y.

Cheers,
Rusty.
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