[PATCH 05/11] persistent_ram: Introduce persistent_ram_vmap()

Anton Vorontsov
2012-05-12T00:19:18Z

Factor out vmap logic out of persistent_ram_buffer_map(), this will
make the code a bit more understandable when we'll add support for
non-bootmem memory.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
---
drivers/staging/android/persistent_ram.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/android/persistent_ram.c b/drivers/staging/android/persistent_ram.c
index c0c3d32..ab8bff1 100644
--- a/drivers/staging/android/persistent_ram.c
+++ b/drivers/staging/android/persistent_ram.c
@@ -318,14 +318,14 @@ void persistent_ram_free_old(struct persistent_ram_zone *prz)
prz->old_log_size = 0;
}

-static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
- struct persistent_ram_zone *prz)
+static void *persistent_ram_vmap(phys_addr_t start, size_t size)
{
struct page **pages;
phys_addr_t page_start;
unsigned int page_count;
pgprot_t prot;
unsigned int i;
+ void *vaddr;

page_start = start - offset_in_page(start);
page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE);
@@ -336,17 +336,26 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
if (!pages) {
pr_err("%s: Failed to allocate array for %u pages\n", __func__,
page_count);
- return -ENOMEM;
+ return NULL;
}

for (i = 0; i < page_count; i++) {
phys_addr_t addr = page_start + i * PAGE_SIZE;
pages[i] = pfn_to_page(addr >> PAGE_SHIFT);
}
- prz->vaddr = vmap(pages, page_count, VM_MAP, prot);
+ vaddr = vmap(pages, page_count, VM_MAP, prot);
kfree(pages);
+
+ return vaddr;
+}
+
+static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
+ struct persistent_ram_zone *prz)
+{
+ prz->vaddr = persistent_ram_vmap(start, size);
if (!prz->vaddr) {
- pr_err("%s: Failed to map %u pages\n", __func__, page_count);
+ pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__,
+ (unsigned long long)size, (unsigned long long)start);
return -ENOMEM;
}

--
1.7.9.2