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pagewalk: separate function pointers from iterator data

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The mm_walk structure currently mixed data and code.  Split out the
operations vectors into a new mm_walk_ops structure, and while we are
changing the API also declare the mm_walk structure inside the
walk_page_range and walk_page_vma functions.

Based on patch from Linus Torvalds.

Link: https://lore.kernel.org/r/20190828141955.22210-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Christoph Hellwig
2019-08-28 16:19:54 +02:00
committed by Jason Gunthorpe
parent a520110e4a
commit 7b86ac3371
13 changed files with 251 additions and 244 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
arch/openrisc/kernel/dma.c
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@@ -44,6 +44,10 @@ page_set_nocache(pte_t *pte, unsigned long addr,
return 0;
}
static const struct mm_walk_ops set_nocache_walk_ops = {
.pte_entry = page_set_nocache,
};
static int
page_clear_nocache(pte_t *pte, unsigned long addr,
unsigned long next, struct mm_walk *walk)
@@ -59,6 +63,10 @@ page_clear_nocache(pte_t *pte, unsigned long addr,
return 0;
}
static const struct mm_walk_ops clear_nocache_walk_ops = {
.pte_entry = page_clear_nocache,
};
/*
* Alloc "coherent" memory, which for OpenRISC means simply uncached.
*
@@ -81,10 +89,6 @@ arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
{
unsigned long va;
void *page;
struct mm_walk walk = {
.pte_entry = page_set_nocache,
.mm = &init_mm
};
page = alloc_pages_exact(size, gfp | __GFP_ZERO);
if (!page)
@@ -99,7 +103,8 @@ arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
* We need to iterate through the pages, clearing the dcache for
* them and setting the cache-inhibit bit.
*/
if (walk_page_range(va, va + size, &walk)) {
if (walk_page_range(&init_mm, va, va + size, &set_nocache_walk_ops,
NULL)) {
free_pages_exact(page, size);
return NULL;
}
@@ -112,13 +117,10 @@ arch_dma_free(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
unsigned long va = (unsigned long)vaddr;
struct mm_walk walk = {
.pte_entry = page_clear_nocache,
.mm = &init_mm
};
/* walk_page_range shouldn't be able to fail here */
WARN_ON(walk_page_range(va, va + size, &walk));
WARN_ON(walk_page_range(&init_mm, va, va + size,
&clear_nocache_walk_ops, NULL));
free_pages_exact(vaddr, size);
}