[openwrt/openwrt] loongarch64: Disable strict alignment to fix BPF program failures

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/9e9206427fba3ca301e9328c3d37f8ce1f14b2e7

commit 9e9206427fba3ca301e9328c3d37f8ce1f14b2e7
Author: Vincent Li <vincent.mc.li at gmail.com>
AuthorDate: Tue Dec 9 17:36:42 2025 -0800

    loongarch64: Disable strict alignment to fix BPF program failures
    
    CONFIG_ARCH_STRICT_ALIGN=y (default in config-6.12) causes BPF programs
    (XDP, TC, tracing, etc.) to fail verification with misaligned packet
    and memory access errors, breaking essential kernel functionality.
    
    Hardware support status:
    - Supported (modern CPUs): 2K2000, 2K3000, 3A5000, 3A6000, 3C5000,
                              3C6000, 3D5000
    - Unsupported (legacy): 2K500, 2K1000
    
    The current default prioritizes legacy compatibility over:
    1. BPF program functionality across multiple subsystems
    2. Performance on widely deployed modern hardware
    3. Modern kernel features relying on unaligned accesses
    
    Since BPF programs require unaligned access capabilities and most
    LoongArch deployments use modern CPUs with hardware support, disable
    CONFIG_ARCH_STRICT_ALIGN. Legacy system users can manually enable
    it if needed.
    
    Link: https://github.com/vincentmli/BPFire/issues/69
    Reference: https://elixir.bootlin.com/linux/v6.12/source/arch/loongarch/Kconfig#L534
    
    Signed-off-by: Vincent Li <vincent.mc.li at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/21121
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 target/linux/loongarch64/config-6.12 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/loongarch64/config-6.12 b/target/linux/loongarch64/config-6.12
index 99a587e6a7..c4fc987b6d 100644
--- a/target/linux/loongarch64/config-6.12
+++ b/target/linux/loongarch64/config-6.12
@@ -52,7 +52,7 @@ CONFIG_ARCH_MMAP_RND_BITS_MIN=12
 CONFIG_ARCH_SELECT_MEMORY_MODEL=y
 CONFIG_ARCH_SPARSEMEM_ENABLE=y
 CONFIG_ARCH_STACKWALK=y
-CONFIG_ARCH_STRICT_ALIGN=y
+# CONFIG_ARCH_STRICT_ALIGN is not set
 CONFIG_ARCH_SUSPEND_POSSIBLE=y
 CONFIG_ARCH_WANTS_NO_INSTR=y
 CONFIG_ARCH_WANTS_THP_SWAP=y