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resource: provide 0args DEFINE_RES variant for unset resource desc

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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>
This commit is contained in:
Christian Marangi
2025-12-13 12:53:09 +01:00
committed by Andrew Morton
parent 1965bbb8f3
commit ad533a740c
1 changed files with 6 additions and 1 deletions
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7
include/linux/ioport.h
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@@ -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)