ramips: Switch default kernel to 5.15

I tested kernel 5.15 on my device for several times without any problems.
In my tests, 5.15 kernel has performance improvements such MGLRU.
Finally, initial kernel 6.1 support is imminent. All ramips subtargets have
5.15 as testing kernel. So, it's time to change.

Tested on my Archer C6 v3.2 (mt7621)

Signed-off-by: Rodrigo B. de Sousa Martins <rodrigo.sousa.577@gmail.com>
[reformat commit subject and message]
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

diff --git a/target/linux/ramips/Makefile b/target/linux/ramips/Makefile
index 7d34dfe6761b158759be9c25e9cb0ee97a94f3f2..77b82d5334c220aab744482bba72e2a2dc5fdfe7 100644 (file)
--- a/target/linux/ramips/Makefile
+++ b/target/linux/ramips/Makefile
@@ -10,8 +10,7 @@ BOARDNAME:=MediaTek Ralink MIPS
 SUBTARGETS:=mt7620 mt7621 mt76x8 rt288x rt305x rt3883
 FEATURES:=squashfs gpio
 
-KERNEL_PATCHVER:=5.10
-KERNEL_TESTING_PATCHVER:=5.15
+KERNEL_PATCHVER:=5.15
 
 define Target/Description
        Build firmware images for Ralink RT288x/RT3xxx based boards.