diff options
| author | Christian Marangi <ansuelsmth@gmail.com> | 2025-12-13 12:53:09 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-01-26 19:07:10 -0800 |
| commit | ad533a740c7ccb801619ed962807605254fe7545 (patch) | |
| tree | 9b859db1b085c94ad49fc88cbd4004064c54ae08 /include/linux | |
| parent | 1965bbb8f3c72e5f1972b5eeb6f19a36664a676d (diff) | |
resource: provide 0args DEFINE_RES variant for unset resource desc
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 <ansuelsmth@gmail.com>
Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/ioport.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 9afa30f9346f..e974fc087059 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -10,6 +10,7 @@ #define _LINUX_IOPORT_H #ifndef __ASSEMBLY__ +#include <linux/args.h> #include <linux/bits.h> #include <linux/compiler.h> #include <linux/minmax.h> @@ -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) |