linux-kernel - [PATCH 5.18 152/231] ARM: 9212/1: domain: Modify Kconfig help text

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Message-Id: <20220719114727.105994758@linuxfoundation.org>
Date:   Tue, 19 Jul 2022 13:53:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 152/231] ARM: 9212/1: domain: Modify Kconfig help text

From: Linus Walleij <linus.walleij@...aro.org>

[ Upstream commit 2bf6204240fddb22cc4940b9e3f40c538390212e ]

After the removal of set_fs() the reference to set_fs() is stale.
Alter the helptext to reflect what the config option really does.

Fixes: 8ac6f5d7f84b ("ARM: 9113/1: uaccess: remove set_fs() implementation")
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/mm/Kconfig | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index d30ee26ccc87..6284914f4361 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -631,7 +631,11 @@ config CPU_USE_DOMAINS
 	bool
 	help
 	  This option enables or disables the use of domain switching
-	  via the set_fs() function.
+	  using the DACR (domain access control register) to protect memory
+	  domains from each other. In Linux we use three domains: kernel, user
+	  and IO. The domains are used to protect userspace from kernelspace
+	  and to handle IO-space as a special type of memory by assigning
+	  manager or client roles to running code (such as a process).
 
 config CPU_V7M_NUM_IRQ
 	int "Number of external interrupts connected to the NVIC"
-- 
2.35.1