mm/resource: Use resource_overlaps() to simplify region_intersects()

The three checks in region_intersects() are basically an open-coded version
of resource_overlaps() - so use the real thing.

Also fix typos in comments while at it.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Like Xu <like.xu@linux.intel.com>
Reviewed-by: Yuan Yao <yuan.yao@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akpm@linux-foundation.org
Cc: bhelgaas@google.com
Cc: bp@suse.de
Cc: dan.j.williams@intel.com
Cc: jack@suse.cz
Cc: rdunlap@infradead.org
Cc: tiwai@suse.de
Link: http://lkml.kernel.org/r/20190305083432.23675-1-richardw.yang@linux.intel.com
[ Rewrote the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/iomem.c b/kernel/iomem.c
index f7525e1..93c2644 100644 (file)
--- a/kernel/iomem.c
+++ b/kernel/iomem.c
@@ -55,7 +55,7 @@ static void *try_ram_remap(resource_size_t offset, size_t size,
  *
  * MEMREMAP_WB - matches the default mapping for System RAM on
  * the architecture.  This is usually a read-allocate write-back cache.
- * Morever, if MEMREMAP_WB is specified and the requested remap region is RAM
+ * Moreover, if MEMREMAP_WB is specified and the requested remap region is RAM
  * memremap() will bypass establishing a new mapping and instead return
  * a pointer into the direct map.
  *
@@ -86,7 +86,7 @@ void *memremap(resource_size_t offset, size_t size, unsigned long flags)
        /* Try all mapping types requested until one returns non-NULL */
        if (flags & MEMREMAP_WB) {
                /*
-                * MEMREMAP_WB is special in that it can be satisifed
+                * MEMREMAP_WB is special in that it can be satisfied
                 * from the direct map.  Some archs depend on the
                 * capability of memremap() to autodetect cases where
                 * the requested range is potentially in System RAM.

diff --git a/kernel/resource.c b/kernel/resource.c
index 92190f6..8c15f84 100644 (file)
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -520,21 +520,20 @@ EXPORT_SYMBOL_GPL(page_is_ram);
 int region_intersects(resource_size_t start, size_t size, unsigned long flags,
                      unsigned long desc)
 {
-       resource_size_t end = start + size - 1;
+       struct resource res;
        int type = 0; int other = 0;
        struct resource *p;
 
+       res.start = start;
+       res.end = start + size - 1;
+
        read_lock(&resource_lock);
        for (p = iomem_resource.child; p ; p = p->sibling) {
                bool is_type = (((p->flags & flags) == flags) &&
                                ((desc == IORES_DESC_NONE) ||
                                 (desc == p->desc)));
 
-               if (start >= p->start && start <= p->end)
-                       is_type ? type++ : other++;
-               if (end >= p->start && end <= p->end)
-                       is_type ? type++ : other++;
-               if (p->start >= start && p->end <= end)
+               if (resource_overlaps(p, &res))
                        is_type ? type++ : other++;
        }
        read_unlock(&resource_lock);