From: Todd Poynor <toddpoynor@google.com>
Date: Fri, 20 Jul 2018 03:49:13 +0000 (-0700)
Subject: staging: gasket: gasket_mmap use PAGE_MASK
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=fd5d76ab69a565ebcab94f11f185ea3dc5588249;p=openwrt%2Fstaging%2Fblogic.git

staging: gasket: gasket_mmap use PAGE_MASK

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

Reported-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Simon Que <sque@chromium.org>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 3cf918f9d260..ae5febec8844 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);