Fix PR creation commit message extraction

Signed-off-by: Shreeya Patel <[email protected]>

Author: shreeya-patel98

.github/workflows/kernel-build-and-test-x86_64.yml

@@ -402,9 +402,18 @@ jobs:
     - name: Checkout kernel source
       uses: actions/checkout@v4
       with:
-        fetch-depth: 50  # Shallow clone: enough for commit messages and logs
+        fetch-depth: 100  # Fetch more history for commit counting
         token: ${{ secrets.GITHUB_TOKEN }}
 
+    - name: Fetch base branch for commit comparison
+      run: |
+        BASE_BRANCH="${{ needs.compare-results.outputs.base_branch }}"
+        if [ -n "$BASE_BRANCH" ]; then
+          # Fetch just the base branch tip (shallow)
+          git fetch --depth=1 origin "$BASE_BRANCH:refs/remotes/origin/$BASE_BRANCH" || true
+          echo "Fetched base branch: $BASE_BRANCH"
+        fi
+
     - name: Download kernel compilation logs
       uses: actions/download-artifact@v4
       with: