x86/xen: Use DIV_ROUND_UP

The kernel.h macro DIV_ROUND_UP performs the computation
(((n) + (d) - 1) /(d)) but is perhaps more readable.

The Coccinelle script used to make this change is as follows:
@haskernel@
@@

@depends on haskernel@
expression n,d;
@@

(
- (n + d - 1) / d
+ DIV_ROUND_UP(n,d)
|
- (n + (d - 1)) / d
+ DIV_ROUND_UP(n,d)
)

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
(cherry picked from commit 585423c8c4d2f39a2c299bc6dd16433e6141fba5)
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Orabug: 24820937

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 8015db319bd7b15c9c9f36b2a2b65dae1b0ab42a..928916bfb0d6e2923b41a943ea114ca3cef402d1 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -620,7 +620,7 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
 {
        unsigned long va = dtr->address;
        unsigned int size = dtr->size + 1;
-       unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
+       unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
        unsigned long frames[pages];
        int f;
 
@@ -669,7 +669,7 @@ static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
 {
        unsigned long va = dtr->address;
        unsigned int size = dtr->size + 1;
-       unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
+       unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
        unsigned long frames[pages];
        int f;