calculate-overlay/profiles/templates/3.6/6_ac_install_patch/sys-kernel/calculate-sources/5.12/4503_zstd-patches_2.patch

# Calculate format=diff
From 22dd6599c5d261925175a2f8a661c1c5d8755211 Mon Sep 17 00:00:00 2001
From: torvic9 <torvic9@mailbox.org>
Date: Fri, 2 Apr 2021 15:56:36 +0200
Subject: [PATCH 2/4] allow setting zstd compression level for kernel

Signed-off-by: torvic9 <torvic9@mailbox.org>
---
 arch/x86/boot/compressed/Makefile |  5 +++++
 init/Kconfig                      | 19 +++++++++++++++++++
 scripts/Makefile.lib              |  4 ++--
 3 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index e0bc3988c..59ed10c61 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -130,8 +130,13 @@ $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
 	$(call if_changed,lzo)
 $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
 	$(call if_changed,lz4)
+ifdef CONFIG_KERNEL_ZSTD_ULTRA
 $(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE
 	$(call if_changed,zstd22)
+else
+$(obj)/vmlinux.bin.zst: $(vmlinux.bin.all-y) FORCE
+	$(call if_changed,zstd)
+endif
 
 suffix-$(CONFIG_KERNEL_GZIP)	:= gz
 suffix-$(CONFIG_KERNEL_BZIP2)	:= bz2
diff --git a/init/Kconfig b/init/Kconfig
index ecaccccd0..34384e4a1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -309,6 +309,25 @@ config KERNEL_UNCOMPRESSED
 
 endchoice
 
+menu "ZSTD compression options"
+    depends on KERNEL_ZSTD
+
+config KERNEL_ZSTD_LEVEL
+    int "Compression level (1-19)"
+    range 1 19
+    default 19
+    help
+        Choose a compression level for zstd kernel compression.
+        Default is 19.
+
+config KERNEL_ZSTD_LEVEL_ULTRA
+    bool "Ultra compression"
+    help
+        Selecting this overrides the chosen compression level and enables
+        the highest possible compression level for zstd (ultra-22).
+
+endmenu
+
 config DEFAULT_INIT
 	string "Default init path"
 	default ""
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 8cd67b1b6..f2dfaa5a0 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -455,10 +455,10 @@ quiet_cmd_xzmisc = XZMISC  $@
 # be used because it would require zstd to allocate a 128 MB buffer.
 
 quiet_cmd_zstd = ZSTD    $@
-      cmd_zstd = { cat $(real-prereqs) | $(ZSTD) -19; $(size_append); } > $@
+      cmd_zstd = { cat $(real-prereqs) | $(ZSTD) -$(CONFIG_KERNEL_ZSTD_LEVEL) -T0; $(size_append); } > $@
 
 quiet_cmd_zstd22 = ZSTD22  $@
-      cmd_zstd22 = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
+      cmd_zstd22 = { cat $(real-prereqs) | $(ZSTD) -22 --ultra -T0; $(size_append); } > $@
 
 # ASM offsets
 # ---------------------------------------------------------------------------
-- 
2.31.1.305.gd1b10fc6d8