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SubjectRe: [PATCH] kernel, resource: use resource_overlaps() to simplify region_intersects()
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On 2019/2/12 8:13, Wei Yang wrote:
> On Mon, Jan 21, 2019 at 09:20:28AM +0800, Wei Yang wrote:
>> The three checks in region_intersects() is to see whether two resources
>> overlap. This means it could be simplified with one resource_overlaps().
>>
>> Also fix two typo in related function.
>>
>> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
>
> Hello~
>
> Would someone like to take a look?

No semantic change and it looks good to me.

Reviewed-by: Like Xu <like.xu@linux.intel.com>

You may use scripts/get_maintainer.pl to cc more maintainers.

>
>> ---
>> kernel/iomem.c | 4 ++--
>> kernel/resource.c | 11 +++++------
>> 2 files changed, 7 insertions(+), 8 deletions(-)
>>
>> diff --git a/kernel/iomem.c b/kernel/iomem.c
>> index f7525e14ebc6..93c264444510 100644
>> --- 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 b0fbf685c77a..34dfb94305bb 100644
>> --- a/kernel/resource.c
>> +++ b/kernel/resource.c
>> @@ -521,21 +521,20 @@ 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);
>> --
>> 2.19.1
>

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