lkml.org 
[lkml]   [2019]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] kernel, resource: use resource_overlaps() to simplify region_intersects()
On Tue, Mar 05, 2019 at 01:45:31PM +0800, Like Xu wrote:
>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.
>

Yep, thanks for your suggestion :-)

>>
>> > ---
>> > 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
>>

--
Wei Yang
Help you, Help me

\
 
 \ /
  Last update: 2019-03-05 06:51    [W:0.047 / U:4.248 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site