[openwrt/openwrt] build: fix incorrect initramfs gzip compression

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/4ab4b9ea818d24b66df146ef1c34ea7e9096b775

commit 4ab4b9ea818d24b66df146ef1c34ea7e9096b775
Author: Tony Butler <spudz76 at gmail.com>
AuthorDate: Mon Apr 17 19:32:18 2023 -0700

    build: fix incorrect initramfs gzip compression
    
    Requires: tools/libdeflate
    
    fix consistency of executable to use
    `$(STAGING_DIR_HOST)/bin/libdeflate-gzip`, and not system-installed ones
    from the usual environment `PATH`;
    this affects option `CONFIG_KERNEL_INITRAMFS_COMPRESSION_GZIP`
    
    this may have worked in the past but only via side effect of having the
    binaries on the host system (and whatever unpredictable version or
    patchset those might be), and did not use the improved but totally
    compatible libdeflate-gzip
    
    Fixes: 330bd380e8b6 ("image: allow building FIT and uImage with ramdisk")
    Signed-off-by: Tony Butler <spudz76 at gmail.com>
---
 include/kernel-defaults.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/kernel-defaults.mk b/include/kernel-defaults.mk
index c1976ee6c7..4029dad738 100644
--- a/include/kernel-defaults.mk
+++ b/include/kernel-defaults.mk
@@ -178,7 +178,7 @@ else
 endif
 	$(if $(SOURCE_DATE_EPOCH),touch -hcd "@$(SOURCE_DATE_EPOCH)" $(KERNEL_BUILD_DIR)/initrd.cpio)
 	$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_BZIP2),$(STAGING_DIR_HOST)/bin/bzip2 -9 -c < $(KERNEL_BUILD_DIR)/initrd.cpio > $(KERNEL_BUILD_DIR)/initrd.cpio.bzip2)
-	$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_GZIP),gzip -n -f -S .gzip -9n $(KERNEL_BUILD_DIR)/initrd.cpio)
+	$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_GZIP),$(STAGING_DIR_HOST)/bin/libdeflate-gzip -n -f -S .gzip -12 $(KERNEL_BUILD_DIR)/initrd.cpio)
 	$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZ4),$(STAGING_DIR_HOST)/bin/lz4c -l -c1 -fz --favor-decSpeed $(KERNEL_BUILD_DIR)/initrd.cpio)
 	$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZMA),$(STAGING_DIR_HOST)/bin/lzma e -lc1 -lp2 -pb2 $(KERNEL_BUILD_DIR)/initrd.cpio $(KERNEL_BUILD_DIR)/initrd.cpio.lzma)
 	$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZO),$(STAGING_DIR_HOST)/bin/lzop -9 -f $(KERNEL_BUILD_DIR)/initrd.cpio)