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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-11-03 23:45:06 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-11-17 20:06:28 +0300 |
| commit | 5562f35d7feabfd68cd58a1ee28b451f90e82417 (patch) | |
| tree | a72f14858037d42dda492f778336545226fa0b0d /include/linux/ioport.h | |
| parent | 1f90f6a835514cb69bfede0b2752b0cb7a351bbd (diff) | |
| download | linux-5562f35d7feabfd68cd58a1ee28b451f90e82417.tar.xz | |
resource: Introduce resource_union() for overlapping resources
Some already present users may utilize resource_union() helper.
Provide it for them and for wider use in the future.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/ioport.h')
| -rw-r--r-- | include/linux/ioport.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h index df4581107536..40320eb5bc0e 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -10,9 +10,10 @@ #define _LINUX_IOPORT_H #ifndef __ASSEMBLY__ +#include <linux/bits.h> #include <linux/compiler.h> +#include <linux/minmax.h> #include <linux/types.h> -#include <linux/bits.h> /* * Resources are tree-like, allowing * nesting etc.. @@ -235,6 +236,16 @@ static inline bool resource_overlaps(struct resource *r1, struct resource *r2) return r1->start <= r2->end && r1->end >= r2->start; } +static inline bool +resource_union(struct resource *r1, struct resource *r2, struct resource *r) +{ + if (!resource_overlaps(r1, r2)) + return false; + r->start = min(r1->start, r2->start); + r->end = max(r1->end, r2->end); + return true; +} + /* Convenience shorthand with allocation */ #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0) #define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED) |