[PATCH 52/64] arch/openrisc: use mm locking wrappers

[Davidlohr Bueso]

From: Davidlohr Bueso <d...@stgolabs.net>

This becomes quite straightforward with the mmrange in place.

Signed-off-by: Davidlohr Bueso <dbu...@suse.de>
---
 arch/openrisc/kernel/dma.c |  6 ++++--
 arch/openrisc/mm/fault.c   | 10 +++++-----
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c
index a945f00011b4..9fee5388f647 100644
--- a/arch/openrisc/kernel/dma.c
+++ b/arch/openrisc/kernel/dma.c
@@ -87,6 +87,7 @@ or1k_dma_alloc(struct device *dev, size_t size,
 {
        unsigned long va;
        void *page;
+       DEFINE_RANGE_LOCK_FULL(mmrange);
        struct mm_walk walk = {
                .pte_entry = page_set_nocache,
                .mm = &init_mm
@@ -106,7 +107,7 @@ or1k_dma_alloc(struct device *dev, size_t size,
                 * 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(va, va + size, &walk, &mmrange)) {
                        free_pages_exact(page, size);
                        return NULL;
                }
@@ -120,6 +121,7 @@ or1k_dma_free(struct device *dev, size_t size, void *vaddr,
              dma_addr_t dma_handle, unsigned long attrs)
 {
        unsigned long va = (unsigned long)vaddr;
+       DEFINE_RANGE_LOCK_FULL(mmrange);
        struct mm_walk walk = {
                .pte_entry = page_clear_nocache,
                .mm = &init_mm
@@ -127,7 +129,7 @@ or1k_dma_free(struct device *dev, size_t size, void *vaddr,
 
        if ((attrs & DMA_ATTR_NON_CONSISTENT) == 0) {
                /* walk_page_range shouldn't be able to fail here */
-               WARN_ON(walk_page_range(va, va + size, &walk));
+               WARN_ON(walk_page_range(va, va + size, &walk, &mmrange));
        }
 
        free_pages_exact(vaddr, size);
diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c
index 75ddb1e8e7e7..81f6d509bf64 100644
--- a/arch/openrisc/mm/fault.c
+++ b/arch/openrisc/mm/fault.c
@@ -109,7 +109,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, 
unsigned long address,
                goto no_context;
 
 retry:
-       down_read(&mm->mmap_sem);
+       mm_read_lock(mm, &mmrange);
        vma = find_vma(mm, address);
 
        if (!vma)
@@ -198,7 +198,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, 
unsigned long address,
                }
        }
 
-       up_read(&mm->mmap_sem);
+       mm_read_unlock(mm, &mmrange);
        return;
 
        /*
@@ -207,7 +207,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, 
unsigned long address,
         */
 
 bad_area:
-       up_read(&mm->mmap_sem);
+       mm_read_unlock(mm, &mmrange);
 
 bad_area_nosemaphore:
 
@@ -270,14 +270,14 @@ asmlinkage void do_page_fault(struct pt_regs *regs, 
unsigned long address,
        __asm__ __volatile__("l.nop 42");
        __asm__ __volatile__("l.nop 1");
 
-       up_read(&mm->mmap_sem);
+       mm_read_unlock(mm, &mmrange);
        if (!user_mode(regs))
                goto no_context;
        pagefault_out_of_memory();
        return;
 
 do_sigbus:
-       up_read(&mm->mmap_sem);
+       mm_read_unlock(mm, &mmrange);
 
        /*
         * Send a sigbus, regardless of whether we were in kernel
-- 
2.13.6