mm/vmalloc.c: clean up map_vm_area third argument
Currently map_vm_area() takes (struct page *** pages) as third argument,
and after mapping, it moves (*pages) to point to (*pages +
nr_mappped_pages).
It looks like this kind of increment is useless to its caller these
days. The callers don't care about the increments and actually they're
trying to avoid this by passing another copy to map_vm_area().
The caller can always guarantee all the pages can be mapped into vm_area
as specified in first argument and the caller only cares about whether
map_vm_area() fails or not.
This patch cleans up the pointer movement in map_vm_area() and updates
its callers accordingly.
Signed-off-by: WANG Chao <chaowang@redhat.com>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/tile/kernel/module.c b/arch/tile/kernel/module.c
index 4918d91..d19b13e 100644
--- a/arch/tile/kernel/module.c
+++ b/arch/tile/kernel/module.c
@@ -58,7 +58,7 @@
area->nr_pages = npages;
area->pages = pages;
- if (map_vm_area(area, prot_rwx, &pages)) {
+ if (map_vm_area(area, prot_rwx, pages)) {
vunmap(area->addr);
goto error;
}
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index 0bf1e4e..6590558 100644
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -42,7 +42,6 @@
static __init int map_switcher(void)
{
int i, err;
- struct page **pagep;
/*
* Map the Switcher in to high memory.
@@ -110,11 +109,9 @@
* This code actually sets up the pages we've allocated to appear at
* switcher_addr. map_vm_area() takes the vma we allocated above, the
* kind of pages we're mapping (kernel pages), and a pointer to our
- * array of struct pages. It increments that pointer, but we don't
- * care.
+ * array of struct pages.
*/
- pagep = lg_switcher_pages;
- err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, &pagep);
+ err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, lg_switcher_pages);
if (err) {
printk("lguest: map_vm_area failed: %i\n", err);
goto free_vma;
diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 02b0379..4f34dc0 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -585,7 +585,6 @@
for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
int ret;
- struct page **page_array_ptr;
page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
@@ -598,8 +597,7 @@
}
tmp_area.addr = page_addr;
tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
- page_array_ptr = page;
- ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
+ ret = map_vm_area(&tmp_area, PAGE_KERNEL, page);
if (ret) {
pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
proc->pid, page_addr);
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 4b8a891..b87696f 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -113,7 +113,7 @@
extern struct vm_struct *find_vm_area(const void *addr);
extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
- struct page ***pages);
+ struct page **pages);
#ifdef CONFIG_MMU
extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
pgprot_t prot, struct page **pages);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 9ec4173..2b0aa54 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1270,19 +1270,15 @@
}
EXPORT_SYMBOL_GPL(unmap_kernel_range);
-int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)
+int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages)
{
unsigned long addr = (unsigned long)area->addr;
unsigned long end = addr + get_vm_area_size(area);
int err;
- err = vmap_page_range(addr, end, prot, *pages);
- if (err > 0) {
- *pages += err;
- err = 0;
- }
+ err = vmap_page_range(addr, end, prot, pages);
- return err;
+ return err > 0 ? 0 : err;
}
EXPORT_SYMBOL_GPL(map_vm_area);
@@ -1548,7 +1544,7 @@
if (!area)
return NULL;
- if (map_vm_area(area, prot, &pages)) {
+ if (map_vm_area(area, prot, pages)) {
vunmap(area->addr);
return NULL;
}
@@ -1606,7 +1602,7 @@
cond_resched();
}
- if (map_vm_area(area, prot, &pages))
+ if (map_vm_area(area, prot, pages))
goto fail;
return area->addr;
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index fe78189..bb62a4a 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -690,7 +690,7 @@
static inline void *__zs_map_object(struct mapping_area *area,
struct page *pages[2], int off, int size)
{
- BUG_ON(map_vm_area(area->vm, PAGE_KERNEL, &pages));
+ BUG_ON(map_vm_area(area->vm, PAGE_KERNEL, pages));
area->vm_addr = area->vm->addr;
return area->vm_addr + off;
}