linux-kernel - [PATCH 4/4] random: Make RANDOM_TRUST_CPU depend on ARCH

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Date:   Mon, 10 Feb 2020 13:00:15 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     broonie@...nel.org, catalin.marinas@....com, mark.rutland@....com,
        richard.henderson@...aro.org, tytso@....edu, will@...nel.org
Subject: [PATCH 4/4] random: Make RANDOM_TRUST_CPU depend on ARCH_RANDOM

From: Richard Henderson <richard.henderson@...aro.org>

Listing the set of host architectures does not scale.
Depend instead on the existence of the architecture rng.

This will allow RANDOM_TRUST_CPU to be selected on arm64. Today
ARCH_RANDOM is only selected by x86, s390, and powerpc, so this does not
adversely affect other architectures.

Signed-off-by: Richard Henderson <richard.henderson@...aro.org>
Signed-off-by: Mark Rutland <mark.rutland@....com>
---
 drivers/char/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 26956c006987..84207d5a9bb0 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -539,7 +539,7 @@ endmenu
 
 config RANDOM_TRUST_CPU
 	bool "Trust the CPU manufacturer to initialize Linux's CRNG"
-	depends on X86 || S390 || PPC
+	depends on ARCH_RANDOM
 	default n
 	help
 	Assume that CPU manufacturer (e.g., Intel or AMD for RDSEED or
-- 
2.11.0