ci: sort patch series into directories

Sorting patch series into directories, so it's easier to swap out
individual series without renaming the patch numbers on everything that
comes after. Leave gaps in the numbering of the series directories, so
that it's easy to potentially insert new series in the middle, if
needed.

Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

Author: roypat

resources/hiding_ci/build_and_install_kernel.sh

@@ -65,6 +65,8 @@ confirm() {
 }
 
 apply_patch_file() {
+  echo "Applying patch:" $(basename $1)
+
   git apply $1
 }
 
@@ -75,6 +77,23 @@ apply_patch_or_series() {
   esac
 }
 
+apply_all_patches() {
+  if [ ! -d "$1" ]; then
+    echo "Not a directory: $1"
+    return
+  fi
+
+  echo "Applying all patches in $1"
+
+  for f in $1/*; do
+    if [ -d $f ]; then
+      apply_all_patches $f
+    else
+      apply_patch_or_series $f
+    fi
+  done
+}
+
 check_new_config() {
   if [[ -e "/boot/config-$KERNEL_VERSION" ]]; then
     return 0;
@@ -156,10 +175,7 @@ git fetch --depth 1 origin $KERNEL_COMMIT_HASH
 git checkout FETCH_HEAD
 
 # Apply our patches on top
-for PATCH in $KERNEL_PATCHES_DIR/*.*; do
-  echo "Applying patch:" $(basename $PATCH)
-  apply_patch_or_series $PATCH
-done
+apply_all_patches $KERNEL_PATCHES_DIR
 
 echo "Making kernel config ready for build"
 # We use olddefconfig to automatically pull in the

resources/hiding_ci/linux_patches/0001-mm-Consolidate-freeing-of-typed-folios-on-final-foli.patch renamed to resources/hiding_ci/linux_patches/05-mmap-support/0001-mm-Consolidate-freeing-of-typed-folios-on-final-foli.patch

@@ -1,8 +1,8 @@
 # Linux kernel patches for direct map removal
 
-The Linux kernel patches in this directory are distributed under the `GPL-2.0`
-licence (see the full licence text at [GPL-2.0](./GPL-2.0)). The patches are
-required by Firecracker's "Secret Freedom" feature that removes the VM memory
-from the host direct map (see
+The Linux kernel patches in this directory and its subdirectories are
+distributed under the `GPL-2.0` licence (see the full licence text at
+[GPL-2.0](./GPL-2.0)). The patches are required by Firecracker's "Secret
+Freedom" feature that removes the VM memory from the host direct map (see
 [lore](https://lore.kernel.org/kvm/20250221160728.1584559-1-roypat@amazon.co.uk/)
 for more details). The patches are not yet merged upstream.