[openwrt/openwrt] kernel: drop patch adding hardcoded kernel compilation flags

[LEDE Commits]

rmilecki pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/4ec80cd907f25a056c1bca82d6ab722e59321eba

commit 4ec80cd907f25a056c1bca82d6ab722e59321eba
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Wed Jun 15 12:36:37 2022 +0200

    kernel: drop patch adding hardcoded kernel compilation flags
    
    1. KCFLAGS should be used for custom flags
    2. Optimization flags are arch / SoC specific
    3. -fno-reorder-blocks may *worsen* network performace on some SoCs
    4. Usage of flags was *reversed* since 5.4 and noone reported that
    
    If we really need custom flags then CONFIG_KERNEL_CFLAGS should get
    default value adjusted properly (per target).
    
    Ref: 4e0c54bc5bc8 ("kernel: add support for kernel 5.4")
    Link: http://lists.openwrt.org/pipermail/openwrt-devel/2022-June/038853.html
    Link: https://patchwork.ozlabs.org/project/openwrt/patch/20190409093046.13401-1-zajec5@gmail.com/
    Cc: Felix Fietkau <nbd at nbd.name>
    Cc: Hauke Mehrtens <hauke at hauke-m.de>
    Cc: Rui Salvaterra <rsalvaterra at gmail.com>
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
    Acked-by: Hauke Mehrtens <hauke at hauke-m.de>
    (cherry picked from commit 22168ae68101b95d03741b0e9e8ad20b8a5ae5b7)
---
 .../pending-5.4/201-extra_optimization.patch       | 25 ----------------------
 1 file changed, 25 deletions(-)

diff --git a/target/linux/generic/pending-5.4/201-extra_optimization.patch b/target/linux/generic/pending-5.4/201-extra_optimization.patch
deleted file mode 100644
index 4395a3e6a7..0000000000
--- a/target/linux/generic/pending-5.4/201-extra_optimization.patch
+++ /dev/null
@@ -1,25 +0,0 @@
-From: Felix Fietkau <nbd at nbd.name>
-Subject: Upgrade to Linux 2.6.19
-
-- Includes large parts of the patch from #1021 by dpalffy
-- Includes RB532 NAND driver changes by n0-1
-
-[john at phrozen.org: feix will add this to his upstream queue]
-
-lede-commit: bff468813f78f81e36ebb2a3f4354de7365e640f
-Signed-off-by: Felix Fietkau <nbd at nbd.name>
----
- Makefile | 6 +++---
- 1 file changed, 3 insertions(+), 3 deletions(-)
-
---- a/Makefile
-+++ b/Makefile
-@@ -723,7 +723,7 @@ KBUILD_CFLAGS += -O2
- else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
- KBUILD_CFLAGS += -O3
- else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
--KBUILD_CFLAGS += -Os
-+KBUILD_CFLAGS += -Os -fno-reorder-blocks -fno-tree-ch
- endif
- 
- # Tell gcc to never replace conditional load with a non-conditional one