diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/highmem.c | 12 | ||||
| -rw-r--r-- | mm/page_io.c | 3 | ||||
| -rw-r--r-- | mm/swap.c | 3 |
3 files changed, 15 insertions, 3 deletions
diff --git a/mm/highmem.c b/mm/highmem.c index 57d82c6..d517cd1 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -94,6 +94,18 @@ static DECLARE_WAIT_QUEUE_HEAD(pkmap_map_wait); do { spin_unlock(&kmap_lock); (void)(flags); } while (0) #endif +struct page *kmap_to_page(void *vaddr) +{ + unsigned long addr = (unsigned long)vaddr; + + if (addr >= PKMAP_ADDR(0) && addr <= PKMAP_ADDR(LAST_PKMAP)) { + int i = (addr - PKMAP_ADDR(0)) >> PAGE_SHIFT; + return pte_page(pkmap_page_table[i]); + } + + return virt_to_page(addr); +} + static void flush_all_zero_pkmaps(void) { int i; diff --git a/mm/page_io.c b/mm/page_io.c index 4a37962..78eee32 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -205,7 +205,7 @@ int swap_writepage(struct page *page, struct writeback_control *wbc) struct file *swap_file = sis->swap_file; struct address_space *mapping = swap_file->f_mapping; struct iovec iov = { - .iov_base = page_address(page), + .iov_base = kmap(page), .iov_len = PAGE_SIZE, }; @@ -218,6 +218,7 @@ int swap_writepage(struct page *page, struct writeback_control *wbc) ret = mapping->a_ops->direct_IO(KERNEL_WRITE, &kiocb, &iov, kiocb.ki_pos, 1); + kunmap(page); if (ret == PAGE_SIZE) { count_vm_event(PSWPOUT); ret = 0; @@ -258,8 +258,7 @@ int get_kernel_pages(const struct kvec *kiov, int nr_segs, int write, if (WARN_ON(kiov[seg].iov_len != PAGE_SIZE)) return seg; - /* virt_to_page sanity checks the PFN */ - pages[seg] = virt_to_page(kiov[seg].iov_base); + pages[seg] = kmap_to_page(kiov[seg].iov_base); page_cache_get(pages[seg]); } |
