[PATCH] virt/coco/sev-guest: Convert to use time_after macro

[Zehao Zhang]

Use time_after macro instead of opening it for readability.

time_after(a,b) returns true if the time a is after time b.

The macro deals with the time wrapper correctly. If the timer wrap
changes in future, there will be no need to alter the driver code.

Signed-off-by: Zehao Zhang <zhangzehao@xxxxxxxx>
---
 drivers/virt/coco/sev-guest/sev-guest.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c
index 97dbe715e96a..f17302117c18 100644
--- a/drivers/virt/coco/sev-guest/sev-guest.c
+++ b/drivers/virt/coco/sev-guest/sev-guest.c
@@ -21,6 +21,7 @@
 #include <linux/psp-sev.h>
 #include <uapi/linux/sev-guest.h>
 #include <uapi/linux/psp-sev.h>
+#include <linux/jiffies.h>
 
 #include <asm/svm.h>
 #include <asm/sev.h>
@@ -383,7 +384,7 @@ static int __handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code,
 	 * message sequence number on a different message.
 	 */
 	case -EAGAIN:
-		if (jiffies - req_start > SNP_REQ_MAX_RETRY_DURATION) {
+		if (time_after(jiffies, req_start + SNP_REQ_MAX_RETRY_DURATION)) {
 			rc = -ETIMEDOUT;
 			break;
 		}
-- 
2.35.3