all: revert to one reset button

.github/workflows/llvm-trunk.yml

@@ -139,9 +139,7 @@ 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 (immediately after reset)
+      run: cat $MCDC_HOME/analysis_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

@@ -1,13 +1,13 @@
 #!/bin/bash
 
 #
-# Test the functionality of cnts_reset
+# Test the functionality of 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; echo 1 > /sys/kernel/debug/llvm-cov/reset"
 GUEST_COMMANDS="$GUEST_COMMANDS; cp /sys/kernel/debug/llvm-cov/profraw ."
 
 cd $MCDC_HOME/linux
@@ -19,44 +19,9 @@ if ! grep "LLVM raw profile data, version 10" /tmp/file.log > /dev/null; then
     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
+mkdir -p $MCDC_HOME/analysis_reset
+mv profraw $MCDC_HOME/analysis_reset
+cd $MCDC_HOME/analysis_reset
 
 llvm-profdata merge profraw -o profdata
 llvm-cov show --show-mcdc                                                      \

docs/measure-kernel-mcdc.md

@@ -301,10 +301,9 @@ Let's inspect the directory added to debugfs by our patch:
 ls /sys/kernel/debug/llvm-cov
 ```
 
-which should contain three pseudo files: `profraw`, `cnts_reset` and `bits_reset`.
+which should contain two pseudo files: `profraw` and `reset`.
 
-- Writing to `cnts_reset` will clear the in-memory counters
-- Writing to `bits_reset` will clear the in-memory bitmaps
+- Writing to `reset` will clear the in-memory counters and bitmaps.
 - Reading `profraw` will serialize the in-memory counters and bitmaps in a
   [proper format](https://llvm.org/docs/InstrProfileFormat.html)
   <!-- The essential difference between LLVM 18 and >= 19 is this format. Since