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android: binder: Refactor prev and next buffer into a helper function

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Use helper functions buffer_next and buffer_prev instead
of list_entry to get the next and previous buffers.

Signed-off-by: Sherry Yang <sherryy@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sherry Yang 2017-08-23 08:46:39 -07:00 committed by Greg Kroah-Hartman
parent 9c0dda1495
commit e217621961
1 changed files with 15 additions and 9 deletions
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24
drivers/android/binder_alloc.c
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@ -48,14 +48,23 @@ module_param_named(debug_mask, binder_alloc_debug_mask,
pr_info(x); \
} while (0)
static struct binder_buffer *binder_buffer_next(struct binder_buffer *buffer)
{
return list_entry(buffer->entry.next, struct binder_buffer, entry);
}
static struct binder_buffer *binder_buffer_prev(struct binder_buffer *buffer)
{
return list_entry(buffer->entry.prev, struct binder_buffer, entry);
}
static size_t binder_alloc_buffer_size(struct binder_alloc *alloc,
struct binder_buffer *buffer)
{
if (list_is_last(&buffer->entry, &alloc->buffers))
return alloc->buffer +
alloc->buffer_size - (void *)buffer->data;
return (size_t)list_entry(buffer->entry.next,
struct binder_buffer, entry) - (size_t)buffer->data;
return (size_t)binder_buffer_next(buffer) - (size_t)buffer->data;
}
static void binder_insert_free_buffer(struct binder_alloc *alloc,
@ -470,7 +479,7 @@ static void binder_delete_free_buffer(struct binder_alloc *alloc,
int free_page_start = 1;
BUG_ON(alloc->buffers.next == &buffer->entry);
prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
prev = binder_buffer_prev(buffer);
BUG_ON(!prev->free);
if (buffer_end_page(prev) == buffer_start_page(buffer)) {
free_page_start = 0;
@ -482,8 +491,7 @@ static void binder_delete_free_buffer(struct binder_alloc *alloc,
}
if (!list_is_last(&buffer->entry, &alloc->buffers)) {
next = list_entry(buffer->entry.next,
struct binder_buffer, entry);
next = binder_buffer_next(buffer);
if (buffer_start_page(next) == buffer_end_page(buffer)) {
free_page_end = 0;
if (buffer_start_page(next) ==
@ -544,8 +552,7 @@ static void binder_free_buf_locked(struct binder_alloc *alloc,
rb_erase(&buffer->rb_node, &alloc->allocated_buffers);
buffer->free = 1;
if (!list_is_last(&buffer->entry, &alloc->buffers)) {
struct binder_buffer *next = list_entry(buffer->entry.next,
struct binder_buffer, entry);
struct binder_buffer *next = binder_buffer_next(buffer);
if (next->free) {
rb_erase(&next->rb_node, &alloc->free_buffers);
@ -553,8 +560,7 @@ static void binder_free_buf_locked(struct binder_alloc *alloc,
}
}
if (alloc->buffers.next != &buffer->entry) {
struct binder_buffer *prev = list_entry(buffer->entry.prev,
struct binder_buffer, entry);
struct binder_buffer *prev = binder_buffer_prev(buffer);
if (prev->free) {
binder_delete_free_buffer(alloc, buffer);