[PATCH 13/20] staging: gasket: gasket_mmap use PAGE_MASK

[Todd Poynor]

From: Todd Poynor <toddpoynor@xxxxxxxxxx>

gasket_mmap use PAGE_MASK, instead of performing math on PAGE_SIZE, for
simplicity and clarity.

Reported-by: Guenter Roeck <groeck@xxxxxxxxxxxx>
Signed-off-by: Simon Que <sque@xxxxxxxxxxxx>
Signed-off-by: Todd Poynor <toddpoynor@xxxxxxxxxx>
---
 drivers/staging/gasket/gasket_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 3cf918f9d2604..ae5febec8844c 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -1591,7 +1591,7 @@ static int gasket_mmap(struct file *filp, struct vm_area_struct *vma)
 	}
 	driver_desc = gasket_dev->internal_desc->driver_desc;
 
-	if (vma->vm_start & (PAGE_SIZE - 1)) {
+	if (vma->vm_start & ~PAGE_MASK) {
 		gasket_log_error(
 			gasket_dev, "Base address not page-aligned: 0x%p\n",
 			(void *)vma->vm_start);
-- 
2.18.0.233.g985f88cf7e-goog