linux-kernel - [PATCH v5 15/21] arm64: Add an aliasing facility for the idreg override

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Message-Id: <20210125105019.2946057-16-maz@kernel.org>
Date:   Mon, 25 Jan 2021 10:50:13 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Ajay Patil <pajay@....qualcomm.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kernel-team@...roid.com
Subject: [PATCH v5 15/21] arm64: Add an aliasing facility for the idreg override

In order to map the override of idregs to options that a user
can easily understand, let's introduce yet another option
array, which maps an option to the corresponding idreg options.

Signed-off-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@....com>
Acked-by: David Brazdil <dbrazdil@...gle.com>
---
 arch/arm64/kernel/idreg-override.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c
index 489aa274e3ec..4fad3fc4d104 100644
--- a/arch/arm64/kernel/idreg-override.c
+++ b/arch/arm64/kernel/idreg-override.c
@@ -35,6 +35,12 @@ static const struct ftr_set_desc * const regs[] __initdata = {
 	&mmfr1,
 };
 
+static const struct {
+	const char	*alias;
+	const char	*feature;
+} aliases[] __initdata = {
+};
+
 static char *cmdline_contains_option(const char *cmdline, const char *option)
 {
 	char *str = strstr(cmdline, option);
@@ -88,6 +94,15 @@ static void __init match_options(const char *cmdline)
 	}
 }
 
+static __init void match_aliases(const char *cmdline)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(aliases); i++)
+		if (cmdline_contains_option(cmdline, aliases[i].alias))
+			match_options(aliases[i].feature);
+}
+
 static __init void parse_cmdline(void)
 {
 	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
@@ -108,6 +123,7 @@ static __init void parse_cmdline(void)
 			goto out;
 
 		match_options(prop);
+		match_aliases(prop);
 
 		if (!IS_ENABLED(CONFIG_CMDLINE_EXTEND))
 			return;
@@ -115,6 +131,7 @@ static __init void parse_cmdline(void)
 
 out:
 	match_options(CONFIG_CMDLINE);
+	match_aliases(CONFIG_CMDLINE);
 }
 
 /* Keep checkers quiet */
-- 
2.29.2