[Devel] [PATCH RH8 05/10] fbcon: use kvmalloc() for scrollback buffer

[Andrey Zhadchenko]

From: Konstantin Khorenko <khorenko at virtuozzo.com>

Scrollback frame buffer is rather big - 32K,
so it requires 3rd order page, so let's use kvmalloc() instead of
ordinary kmalloc() for it.

https://pmc.acronis.com/browse/VSTOR-17781
https://jira.sw.ru/browse/HCI-188

Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>

Rebased to vz8:
 - fbcon.c was moved to drivers/video/fbdev/core/fbcon.c

(cherry-picked from e60259bd950c)
Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 5fb9547..4316fd2 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -980,7 +980,7 @@ static const char *fbcon_startup(void)
 			if (!softback_buf) {
 				softback_buf =
 				    (unsigned long)
-				    kmalloc(fbcon_softback_size,
+				    kvmalloc(fbcon_softback_size,
 					    GFP_KERNEL);
 				if (!softback_buf) {
 					fbcon_softback_size = 0;
@@ -989,7 +989,7 @@ static const char *fbcon_startup(void)
 			}
 		} else {
 			if (softback_buf) {
-				kfree((void *) softback_buf);
+				kvfree((void *) softback_buf);
 				softback_buf = 0;
 				softback_top = 0;
 			}
@@ -3553,7 +3553,7 @@ static void fbcon_exit(void)
 	struct fb_info *info;
 	int i, j, mapped;
 
-	kfree((void *)softback_buf);
+	kvfree((void *)softback_buf);
 	softback_buf = 0UL;
 
 	for (i = 0; i < FB_MAX; i++) {
-- 
1.8.3.1