[PATCH v6 15/21] arm64: Add an aliasing facility for the idreg override
From: Marc Zyngier <maz@kernel.org>
Date: 2021-02-01 12:05:37
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
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@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: David Brazdil <redacted> --- arch/arm64/kernel/idreg-override.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c
index 1e4671aa02c8..9658ad6c628a 100644
--- a/arch/arm64/kernel/idreg-override.c
+++ b/arch/arm64/kernel/idreg-override.c@@ -16,6 +16,8 @@ #define FTR_DESC_NAME_LEN 20 #define FTR_DESC_FIELD_LEN 10 +#define FTR_ALIAS_NAME_LEN 30 +#define FTR_ALIAS_OPTION_LEN 80 struct ftr_set_desc { char name[FTR_DESC_NAME_LEN];
@@ -39,6 +41,12 @@ static const struct ftr_set_desc * const regs[] __initconst = { &mmfr1, }; +static const struct { + char alias[FTR_ALIAS_NAME_LEN]; + char feature[FTR_ALIAS_OPTION_LEN]; +} aliases[] __initconst = { +}; + static char *cmdline_contains_option(const char *cmdline, const char *option) { char *str = strstr(cmdline, option);
@@ -95,7 +103,7 @@ static void __init match_options(const char *cmdline) } } -static __init void __parse_cmdline(const char *cmdline) +static __init void __parse_cmdline(const char *cmdline, bool parse_aliases) { do { char buf[256];
@@ -119,6 +127,9 @@ static __init void __parse_cmdline(const char *cmdline) match_options(buf); + for (i = 0; parse_aliases && i < ARRAY_SIZE(aliases); i++) + if (cmdline_contains_option(buf, aliases[i].alias)) + __parse_cmdline(aliases[i].feature, false); } while (1); }
@@ -141,14 +152,14 @@ static __init void parse_cmdline(void) if (!prop) goto out; - __parse_cmdline(prop); + __parse_cmdline(prop, true); if (!IS_ENABLED(CONFIG_CMDLINE_EXTEND)) return; } out: - __parse_cmdline(CONFIG_CMDLINE); + __parse_cmdline(CONFIG_CMDLINE, true); } /* Keep checkers quiet */
--
2.29.2
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