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Date: Thu, 3 Sep 2020 15:29:21 -0700
From: Kees Cook <>
To: Sami Tolvanen <>
Cc: Masahiro Yamada <>, Will Deacon <>,
	Peter Zijlstra <>,
	Steven Rostedt <>,
	Greg Kroah-Hartman <>,
	"Paul E. McKenney" <>,
	Nick Desaulniers <>,,,,,,,,
Subject: Re: [PATCH v2 14/28] kbuild: lto: remove duplicate dependencies from
 .mod files

On Thu, Sep 03, 2020 at 01:30:39PM -0700, Sami Tolvanen wrote:
> With LTO, llvm-nm prints out symbols for each archive member
> separately, which results in a lot of duplicate dependencies in the
> .mod file when CONFIG_TRIM_UNUSED_SYMS is enabled. When a module
> consists of several compilation units, the output can exceed the
> default xargs command size limit and split the dependency list to
> multiple lines, which results in used symbols getting trimmed.
> This change removes duplicate dependencies, which will reduce the
> probability of this happening and makes .mod files smaller and
> easier to read.
> Signed-off-by: Sami Tolvanen <>

Reviewed-by: Kees Cook <>

Kees Cook

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