From ad533a740c7ccb801619ed962807605254fe7545 Mon Sep 17 00:00:00 2001 From: Christian Marangi Date: Sat, 13 Dec 2025 12:53:09 +0100 Subject: [PATCH] resource: provide 0args DEFINE_RES variant for unset resource desc MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Provide a variant of DEFINE_RES that takes 0 arguments to initialize an "unset" resource descriptor. This should be used for the improper case of struct resource res = {}; where DEFINE_RES() should be used. With this new helper variant, it would result in: struct resource res = DEFINE_RES(); instead of having to define the full 3 arguments: struct resource res = DEFINE_RES(0, 0, IORESOURCE_UNSET); DEFINE_RES() with no args, will set the flags to IORESOURCE_UNSET signaling the resource descriptor is UNSET and doesn't reflect an actual resource currently. Link: https://lkml.kernel.org/r/20251213115314.16700-1-ansuelsmth@gmail.com Signed-off-by: Christian Marangi Suggested-by: Ilpo Järvinen Reviewed-by: Bjorn Helgaas Reviewed-by: Andy Shevchenko Signed-off-by: Andrew Morton --- include/linux/ioport.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 9afa30f9346fc..e974fc0870599 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -10,6 +10,7 @@ #define _LINUX_IOPORT_H #ifndef __ASSEMBLY__ +#include #include #include #include @@ -165,8 +166,12 @@ enum { #define DEFINE_RES_NAMED(_start, _size, _name, _flags) \ DEFINE_RES_NAMED_DESC(_start, _size, _name, _flags, IORES_DESC_NONE) -#define DEFINE_RES(_start, _size, _flags) \ +#define __DEFINE_RES0() \ + DEFINE_RES_NAMED(0, 0, NULL, IORESOURCE_UNSET) +#define __DEFINE_RES3(_start, _size, _flags) \ DEFINE_RES_NAMED(_start, _size, NULL, _flags) +#define DEFINE_RES(...) \ + CONCATENATE(__DEFINE_RES, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__) #define DEFINE_RES_IO_NAMED(_start, _size, _name) \ DEFINE_RES_NAMED((_start), (_size), (_name), IORESOURCE_IO) -- 2.47.3