[PATCH 13/21] kernel: allow splitting mainline v5.10 source download in three

["Paul Gortmaker" <paul.gortmaker@windriver.com>]

With a split in two done, extending to three is fairly trivial.  The
only difference is that the introduced "touch down" point of 4.12 has a
fetch depend/ref itself to the other touch down point of 3.8.  The parent
repo (v5.10) has no need of knowledge of what happens prior to 4.12.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 meta/recipes-kernel/linux/linux-3.8.bb  |  9 +++++++++
 meta/recipes-kernel/linux/linux-4.12.bb | 10 ++++++++++
 meta/recipes-kernel/linux/linux-5.10.bb |  5 +++++
 3 files changed, 24 insertions(+)
 create mode 100644 meta/recipes-kernel/linux/linux-3.8.bb
 create mode 100644 meta/recipes-kernel/linux/linux-4.12.bb

diff --git a/meta/recipes-kernel/linux/linux-3.8.bb b/meta/recipes-kernel/linux/linux-3.8.bb
new file mode 100644
index 000000000000..58063ea51691
--- /dev/null
+++ b/meta/recipes-kernel/linux/linux-3.8.bb
@@ -0,0 +1,9 @@
+SUMMARY = "Linux kernel v3.8 source"
+DESCRIPTION = "Fetch source of the linux kernel up to the v3.8 tag"
+
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
+
+KTAG = "3.8"
+
+require recipes-kernel/linux/fetch-linux.inc
diff --git a/meta/recipes-kernel/linux/linux-4.12.bb b/meta/recipes-kernel/linux/linux-4.12.bb
new file mode 100644
index 000000000000..6e8034a77f4a
--- /dev/null
+++ b/meta/recipes-kernel/linux/linux-4.12.bb
@@ -0,0 +1,10 @@
+SUMMARY = "Linux kernel v4.12 source"
+DESCRIPTION = "Fetch source of the linux kernel up to the v4.12 tag"
+
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
+
+KTAG = "4.12"
+KREF = "3.8"
+
+require recipes-kernel/linux/fetch-linux.inc
diff --git a/meta/recipes-kernel/linux/linux-5.10.bb b/meta/recipes-kernel/linux/linux-5.10.bb
index 73e33d405376..373c6b8def2e 100644
--- a/meta/recipes-kernel/linux/linux-5.10.bb
+++ b/meta/recipes-kernel/linux/linux-5.10.bb
@@ -7,12 +7,14 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=6bc538ed5bd9a7fc9398086aedcd7e46"
 KTAG = "5.10"
 
 # We optionally split the v5.10 download via adding refs and depends.
+# Multiple splits are achieved by adding more chained dependencies.
 # Fragmented downloads can be less apt to timeout, but delta compression
 # will lead to object duplication for > 1 objects/pack/*pack file and
 # an increase in overall on-disk totals.  The du -hsm for bare repos:
 #
 # No split:	1521	epoch->5.10
 # One split:	1730	epoch->4.0, 4.0->5.10 (854+877)
+# Two splits:	1928	epoch->3.8, 3.8->4.12, 4.12->5.10 (628+647+653)
 #
 # Download sizes will vary depending on server compression settings.
 
@@ -23,6 +25,9 @@ python __anonymous () {
     if splits == 1:
         d.setVar("KREF", "4.0")
         return
+    if splits == 2:
+        d.setVar("KREF", "4.12")
+        return
     bb.fatal("Unsupported number of v5.10 kernel content splits (%s)." % splits)
 }
 
-- 
2.25.1