Re: [PATCH 1/2] if_enabled.h: Add IF_ENABLED_OR_ELSE() and IF_ENABLED() macros
From: Randy Dunlap <hidden>
Date: 2020-12-08 17:41:03
Also in:
linux-mips, lkml
On 12/8/20 8:48 AM, Paul Cercueil wrote:
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Hi Paul, Why not just add these 2 new macros to <linux/kconfig.h> ? Maybe you don't want to add the other 2 headers there also?
quoted hunk ↗ jump to hunk
--- include/linux/if_enabled.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 include/linux/if_enabled.hdiff --git a/include/linux/if_enabled.h b/include/linux/if_enabled.h new file mode 100644 index 000000000000..8189d1402340 --- /dev/null +++ b/include/linux/if_enabled.h@@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __LINUX_IF_ENABLED_H +#define __LINUX_IF_ENABLED_H + +#include <linux/build_bug.h> +#include <linux/compiler_types.h> +#include <linux/kconfig.h> + +/* + * IF_ENABLED_OR_ELSE(CONFIG_FOO, a, b) evaluates to (a) if CONFIG_FOO is set + * to 'y' or 'm', (b) otherwise. + */ +#define IF_ENABLED_OR_ELSE(option, a, b) \ + (BUILD_BUG_ON_ZERO(__same_type((a), (b))) || IS_ENABLED(option) ? (a) : (b)) + +/* + * IF_ENABLED(CONFIG_FOO, ptr) evaluates to (ptr) if CONFIG_FOO is set to 'y' + * or 'm', NULL otherwise. + */ +#define IF_ENABLED(option, ptr) IF_ENABLED_OR_ELSE(option, ptr, NULL) + +#endif /* __LINUX_IF_ENABLED_H */
thanks. -- ~Randy _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel