linux-kernel - Re: [PATCH] efi/libstub: zboot: do not use $(shell ...) in cmd_copy_and

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Date: Tue, 19 Dec 2023 11:18:31 +0000
From: Will Deacon <will@...nel.org>
To: Ard Biesheuvel <ardb@...nel.org>,
	linux-efi@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	linux-kbuild@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] efi/libstub: zboot: do not use $(shell ...) in cmd_copy_and_pad

On Mon, 18 Dec 2023 17:01:27 +0900, Masahiro Yamada wrote:
> You do not need to use $(shell ...) in recipe lines, as they are already
> executed in a shell. An alternative solution is $$(...), which is an
> escaped sequence of the shell's command substituion, $(...).
> 
> For this case, there is a reason to avoid $(shell ...).
> 
> Kbuild detects command changes by using the if_changed macro, which
> compares the previous command recorded in .*.cmd with the current
> command from Makefile. If they differ, Kbuild re-runs the build rule.
> 
> [...]

Applied to arm64 (for-next/kbuild), thanks!

[1/1] efi/libstub: zboot: do not use $(shell ...) in cmd_copy_and_pad
      https://git.kernel.org/arm64/c/97ba4416d6dd

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev