Messages in this thread Patch in this message | | | From | "Luis R. Rodriguez" <> | Subject | [RFC v1 3/4] init.h: add early_param_on_off() | Date | Wed, 4 Mar 2015 17:24:13 -0800 |
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From: "Luis R. Rodriguez" <mcgrof@suse.com>
At times all you need is a kconfig variable to enable a feature, by default but you may want to also enable / disable it through a kernel parameter. In such cases the parameter routines to turn the thing on / off are really simple. Just use a wrapper for this, it lets us generalize the code and makes it easier to associate parameters with related kernel configuration options.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Tony Lindgren <tony@atomide.com> Cc: linux-kernel@vger.kernel.org Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: x86@kernel.org Cc: Juergen Gross <jgross@suse.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Toshi Kani <toshi.kani@hp.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Jan Beulich <JBeulich@suse.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Borislav Petkov <bp@suse.de> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Dexuan Cui <decui@microsoft.com> Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com> --- include/linux/init.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/include/linux/init.h b/include/linux/init.h index 2df8e8d..bc11ff9 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -268,6 +268,21 @@ struct obs_kernel_param { #define early_param(str, fn) \ __setup_param(str, fn, fn, 1) +#define early_param_on_off(str_on, str_off, var, config) \ + int var = IS_ENABLED(config); \ + static int __init parse_##var##_on(char *arg) \ + { \ + var = 1; \ + return 0; \ + } \ + static int __init parse_##var##_off(char *arg) \ + { \ + var = 0; \ + return 0; \ + } \ + __setup_param(str_on, parse_##var##_on, parse_##var##_on, 1); \ + __setup_param(str_off, parse_##var##_off, parse_##var##_off, 1) + /* Relies on boot_command_line being set */ void __init parse_early_param(void); void __init parse_early_options(char *cmdline); -- 2.2.2
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