Fix PR creation stage

Signed-off-by: Shreeya Patel <spatel@ciq.com>

Author: shreeya-patel98

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

@@ -5,6 +5,7 @@ permissions:
   contents: read
   actions: read
   packages: read
+  pull-requests: write
 
 jobs:
   build:
@@ -199,12 +200,13 @@ jobs:
     if: success() || failure()
     outputs:
       base_branch: ${{ steps.base_branch.outputs.base_branch }}
+      comparison_status: ${{ steps.comparison.outputs.comparison_status }}
 
     steps:
     - name: Checkout kernel source
       uses: actions/checkout@v4
       with:
-        fetch-depth: 0
+        fetch-depth: 0  # Full history needed for reliable merge-base detection
 
     - name: Download current kselftest logs
       uses: actions/download-artifact@v4
@@ -359,15 +361,23 @@ jobs:
     if: success() || failure()
 
     steps:
-    - name: Check if all stages passed
+    - name: Check if tests passed and no regressions
       run: |
+        # Skip PR if any test stage failed
         if [ "${{ needs.build.result }}" != "success" ] || \
            [ "${{ needs.boot.result }}" != "success" ] || \
            [ "${{ needs.test-kselftest.result }}" != "success" ]; then
           echo "One or more test stages failed, skipping PR creation"
           exit 1
         fi
-        echo "All test stages passed, proceeding with PR creation"
+
+        # Skip PR if regression was detected (but allow if comparison was skipped/unavailable)
+        if [ "${{ needs.compare-results.outputs.comparison_status }}" = "failed" ]; then
+          echo "Test regression detected, skipping PR creation"
+          exit 1
+        fi
+
+        echo "All test stages passed and no regressions detected, proceeding with PR creation"
 
     - name: Checkout kernel source
       uses: actions/checkout@v4
@@ -495,6 +505,5 @@ jobs:
             --base "$BASE_BRANCH" \
             --head "${{ github.ref_name }}" \
             --title "[${{ github.ref_name }}] ${{ steps.commit_msg.outputs.commit_subject }}" \
-            --body-file pr_body.md \
-            --label "automated,tested,ready-for-review"
+            --body-file pr_body.md
         fi