ci: verify reset buttons are working

.github/workflows/llvm-19-patch-v0.6.yml

@@ -109,5 +109,9 @@ jobs:
         llc --version
     - name: Boot the kernel and collect coverage
       run: ./ci/5_boot_kernel_and_collect_coverage.sh
+    - name: Print the index of coverage report (immediately after counter reset)
+      run: cat $MCDC_HOME/analysis_cnts_reset/text-coverage-reports/index.txt
+    - name: Print the index of coverage report (immediately after bitmap reset)
+      run: cat $MCDC_HOME/analysis_bits_reset/text-coverage-reports/index.txt
     - name: Print the index of coverage report
       run: cat $MCDC_HOME/analysis/text-coverage-reports/index.txt

ci/5_boot_kernel_and_collect_coverage.sh

@@ -1,5 +1,79 @@
 #!/bin/bash
 
+#
+# Test the functionality of cnts_reset
+#
+
+GUEST_COMMANDS="true"
+GUEST_COMMANDS="$GUEST_COMMANDS; uname -a"
+GUEST_COMMANDS="$GUEST_COMMANDS; ls /sys/kernel/debug/llvm-cov"
+GUEST_COMMANDS="$GUEST_COMMANDS; echo 1 > /sys/kernel/debug/llvm-cov/cnts_reset"
+GUEST_COMMANDS="$GUEST_COMMANDS; cp /sys/kernel/debug/llvm-cov/profraw ."
+
+cd $MCDC_HOME/linux
+$MCDC_HOME/linux-mcdc/scripts/q -c "$GUEST_COMMANDS"
+
+file profraw |& tee /tmp/file.log
+if ! grep "LLVM raw profile data, version 10" /tmp/file.log > /dev/null; then
+    printf "\nUnexpected profraw\n"
+    exit 1
+fi
+
+mkdir -p $MCDC_HOME/analysis_cnts_reset
+mv profraw $MCDC_HOME/analysis_cnts_reset
+cd $MCDC_HOME/analysis_cnts_reset
+
+llvm-profdata merge profraw -o profdata
+llvm-cov show --show-mcdc                                                      \
+              --show-mcdc-summary                                              \
+              --show-region-summary=false                                      \
+              --show-branch-summary=false                                      \
+              --format=text                                                    \
+              -use-color                                                       \
+              -show-directory-coverage                                         \
+              -output-dir=text-coverage-reports                                \
+              -instr-profile profdata                                          \
+              $MCDC_HOME/linux/vmlinux
+
+#
+# Test the functionality of bits_reset
+#
+
+GUEST_COMMANDS="true"
+GUEST_COMMANDS="$GUEST_COMMANDS; uname -a"
+GUEST_COMMANDS="$GUEST_COMMANDS; ls /sys/kernel/debug/llvm-cov"
+GUEST_COMMANDS="$GUEST_COMMANDS; echo 1 > /sys/kernel/debug/llvm-cov/bits_reset"
+GUEST_COMMANDS="$GUEST_COMMANDS; cp /sys/kernel/debug/llvm-cov/profraw ."
+
+cd $MCDC_HOME/linux
+$MCDC_HOME/linux-mcdc/scripts/q -c "$GUEST_COMMANDS"
+
+file profraw |& tee /tmp/file.log
+if ! grep "LLVM raw profile data, version 10" /tmp/file.log > /dev/null; then
+    printf "\nUnexpected profraw\n"
+    exit 1
+fi
+
+mkdir -p $MCDC_HOME/analysis_bits_reset
+mv profraw $MCDC_HOME/analysis_bits_reset
+cd $MCDC_HOME/analysis_bits_reset
+
+llvm-profdata merge profraw -o profdata
+llvm-cov show --show-mcdc                                                      \
+              --show-mcdc-summary                                              \
+              --show-region-summary=false                                      \
+              --show-branch-summary=false                                      \
+              --format=text                                                    \
+              -use-color                                                       \
+              -show-directory-coverage                                         \
+              -output-dir=text-coverage-reports                                \
+              -instr-profile profdata                                          \
+              $MCDC_HOME/linux/vmlinux
+
+#
+# Actual coverage of KUnit + boot
+#
+
 GUEST_COMMANDS="true"
 GUEST_COMMANDS="$GUEST_COMMANDS; uname -a"
 GUEST_COMMANDS="$GUEST_COMMANDS; ls /sys/kernel/debug/llvm-cov"