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Date:   Tue, 16 Aug 2022 12:25:08 -0700
From:   Kees Cook <>
Cc:     Kees Cook <>,,
Subject: Re: [PATCH] gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file

On Tue, 16 Aug 2022 15:17:20 +1000, Andrew Donnellan wrote:
> Commit 36d4b36b6959 ("lib/nodemask: inline next_node_in() and
> node_random()") refactored some code by moving node_random() from
> lib/nodemask.c to include/linux/nodemask.h, thus requiring nodemask.h to
> include random.h, which conditionally defines add_latent_entropy()
> depending on whether the macro LATENT_ENTROPY_PLUGIN is defined.
> This broke the build on powerpc, where nodemask.h is indirectly included
> in arch/powerpc/kernel/prom_init.c, part of the early boot machinery that
> is excluded from the latent entropy plugin using
> DISABLE_LATENT_ENTROPY_PLUGIN. It turns out that while we add a gcc flag
> to disable the actual plugin, we don't undefine LATENT_ENTROPY_PLUGIN.
> [...]

Applied to for-next/hardening, thanks!

[1/1] gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file

Kees Cook

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