Merge tag 'trace-v5.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing and bootconfig updates:
 "Fixes and changes to bootconfig before it goes live in a release.

  Change in API of bootconfig (before it comes live in a release):
  - Have a magic value "BOOTCONFIG" in initrd to know a bootconfig
    exists
  - Set CONFIG_BOOT_CONFIG to 'n' by default
  - Show error if "bootconfig" on cmdline but not compiled in
  - Prevent redefining the same value
  - Have a way to append values
  - Added a SELECT BLK_DEV_INITRD to fix a build failure

  Synthetic event fixes:
  - Switch to raw_smp_processor_id() for recording CPU value in preempt
    section. (No care for what the value actually is)
  - Fix samples always recording u64 values
  - Fix endianess
  - Check number of values matches number of fields
  - Fix a printing bug

  Fix of trace_printk() breaking postponed start up tests

  Make a function static that is only used in a single file"

* tag 'trace-v5.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  bootconfig: Fix CONFIG_BOOTTIME_TRACING dependency issue
  bootconfig: Add append value operator support
  bootconfig: Prohibit re-defining value on same key
  bootconfig: Print array as multiple commands for legacy command line
  bootconfig: Reject subkey and value on same parent key
  tools/bootconfig: Remove unneeded error message silencer
  bootconfig: Add bootconfig magic word for indicating bootconfig explicitly
  bootconfig: Set CONFIG_BOOT_CONFIG=n by default
  tracing: Clear trace_state when starting trace
  bootconfig: Mark boot_config_checksum() static
  tracing: Disable trace_printk() on post poned tests
  tracing: Have synthetic event test use raw_smp_processor_id()
  tracing: Fix number printing bug in print_synth_event()
  tracing: Check that number of vals matches number of synth event fields
  tracing: Make synth_event trace functions endian-correct
  tracing: Make sure synth_event_trace() example always uses u64

6 files changed, 60 insertions, 26 deletions

diff --git a/tools/bootconfig/include/linux/printk.h b/tools/bootconfig/include/linux/printk.h
index e978a63d3222..036e667596eb 100644
--- a/tools/bootconfig/include/linux/printk.h
+++ b/tools/bootconfig/include/linux/printk.h
@@ -4,10 +4,7 @@
 
 #include <stdio.h>
 
-/* controllable printf */
-extern int pr_output;
-#define printk(fmt, ...)	\
-	(pr_output ? printf(fmt, ##__VA_ARGS__) : 0)
+#define printk(fmt, ...) printf(fmt, ##__VA_ARGS__)
 
 #define pr_err printk
 #define pr_warn	printk
diff --git a/tools/bootconfig/main.c b/tools/bootconfig/main.c
index e18eeb070562..a9b97814d1a9 100644
--- a/tools/bootconfig/main.c
+++ b/tools/bootconfig/main.c
@@ -14,8 +14,6 @@
 #include <linux/kernel.h>
 #include <linux/bootconfig.h>
 
-int pr_output = 1;
-
 static int xbc_show_array(struct xbc_node *node)
 {
 	const char *val;
@@ -131,15 +129,26 @@ int load_xbc_from_initrd(int fd, char **buf)
 	struct stat stat;
 	int ret;
 	u32 size = 0, csum = 0, rcsum;
+	char magic[BOOTCONFIG_MAGIC_LEN];
 
 	ret = fstat(fd, &stat);
 	if (ret < 0)
 		return -errno;
 
-	if (stat.st_size < 8)
+	if (stat.st_size < 8 + BOOTCONFIG_MAGIC_LEN)
+		return 0;
+
+	if (lseek(fd, -BOOTCONFIG_MAGIC_LEN, SEEK_END) < 0) {
+		pr_err("Failed to lseek: %d\n", -errno);
+		return -errno;
+	}
+	if (read(fd, magic, BOOTCONFIG_MAGIC_LEN) < 0)
+		return -errno;
+	/* Check the bootconfig magic bytes */
+	if (memcmp(magic, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN) != 0)
 		return 0;
 
-	if (lseek(fd, -8, SEEK_END) < 0) {
+	if (lseek(fd, -(8 + BOOTCONFIG_MAGIC_LEN), SEEK_END) < 0) {
 		pr_err("Failed to lseek: %d\n", -errno);
 		return -errno;
 	}
@@ -150,11 +159,14 @@ int load_xbc_from_initrd(int fd, char **buf)
 	if (read(fd, &csum, sizeof(u32)) < 0)
 		return -errno;
 
-	/* Wrong size, maybe no boot config here */
-	if (stat.st_size < size + 8)
-		return 0;
+	/* Wrong size error  */
+	if (stat.st_size < size + 8 + BOOTCONFIG_MAGIC_LEN) {
+		pr_err("bootconfig size is too big\n");
+		return -E2BIG;
+	}
 
-	if (lseek(fd, stat.st_size - 8 - size, SEEK_SET) < 0) {
+	if (lseek(fd, stat.st_size - (size + 8 + BOOTCONFIG_MAGIC_LEN),
+		  SEEK_SET) < 0) {
 		pr_err("Failed to lseek: %d\n", -errno);
 		return -errno;
 	}
@@ -163,17 +175,17 @@ int load_xbc_from_initrd(int fd, char **buf)
 	if (ret < 0)
 		return ret;
 
-	/* Wrong Checksum, maybe no boot config here */
+	/* Wrong Checksum */
 	rcsum = checksum((unsigned char *)*buf, size);
 	if (csum != rcsum) {
 		pr_err("checksum error: %d != %d\n", csum, rcsum);
-		return 0;
+		return -EINVAL;
 	}
 
 	ret = xbc_init(*buf);
-	/* Wrong data, maybe no boot config here */
+	/* Wrong data */
 	if (ret < 0)
-		return 0;
+		return ret;
 
 	return size;
 }
@@ -213,20 +225,15 @@ int delete_xbc(const char *path)
 		return -errno;
 	}
 
-	/*
-	 * Suppress error messages in xbc_init() because it can be just a
-	 * data which concidentally matches the size and checksum footer.
-	 */
-	pr_output = 0;
 	size = load_xbc_from_initrd(fd, &buf);
-	pr_output = 1;
 	if (size < 0) {
 		ret = size;
 		pr_err("Failed to load a boot config from initrd: %d\n", ret);
 	} else if (size > 0) {
 		ret = fstat(fd, &stat);
 		if (!ret)
-			ret = ftruncate(fd, stat.st_size - size - 8);
+			ret = ftruncate(fd, stat.st_size
+					- size - 8 - BOOTCONFIG_MAGIC_LEN);
 		if (ret)
 			ret = -errno;
 	} /* Ignore if there is no boot config in initrd */
@@ -295,6 +302,12 @@ int apply_xbc(const char *path, const char *xbc_path)
 		pr_err("Failed to apply a boot config: %d\n", ret);
 		return ret;
 	}
+	/* Write a magic word of the bootconfig */
+	ret = write(fd, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN);
+	if (ret < 0) {
+		pr_err("Failed to apply a boot config magic: %d\n", ret);
+		return ret;
+	}
 	close(fd);
 	free(data);
 
diff --git a/tools/bootconfig/samples/bad-mixed-kv1.bconf b/tools/bootconfig/samples/bad-mixed-kv1.bconf
new file mode 100644
index 000000000000..1761547dd05c
--- /dev/null
+++ b/tools/bootconfig/samples/bad-mixed-kv1.bconf
@@ -0,0 +1,3 @@
+# value -> subkey pattern
+key = value
+key.subkey = another-value
diff --git a/tools/bootconfig/samples/bad-mixed-kv2.bconf b/tools/bootconfig/samples/bad-mixed-kv2.bconf
new file mode 100644
index 000000000000..6b32e0c3878c
--- /dev/null
+++ b/tools/bootconfig/samples/bad-mixed-kv2.bconf
@@ -0,0 +1,3 @@
+# subkey -> value pattern
+key.subkey = value
+key = another-value
diff --git a/tools/bootconfig/samples/bad-samekey.bconf b/tools/bootconfig/samples/bad-samekey.bconf
new file mode 100644
index 000000000000..e8d983a4563c
--- /dev/null
+++ b/tools/bootconfig/samples/bad-samekey.bconf
@@ -0,0 +1,6 @@
+# Same key value is not allowed
+key {
+	foo = value
+	bar = value2
+}
+key.foo = value
diff --git a/tools/bootconfig/test-bootconfig.sh b/tools/bootconfig/test-bootconfig.sh
index 1de06de328e2..1411f4c3454f 100755
--- a/tools/bootconfig/test-bootconfig.sh
+++ b/tools/bootconfig/test-bootconfig.sh
@@ -9,7 +9,7 @@ TEMPCONF=`mktemp temp-XXXX.bconf`
 NG=0
 
 cleanup() {
-  rm -f $INITRD $TEMPCONF
+  rm -f $INITRD $TEMPCONF $OUTFILE
   exit $NG
 }
 
@@ -49,7 +49,7 @@ xpass $BOOTCONF -a $TEMPCONF $INITRD
 new_size=$(stat -c %s $INITRD)
 
 echo "File size check"
-xpass test $new_size -eq $(expr $bconf_size + $initrd_size + 9)
+xpass test $new_size -eq $(expr $bconf_size + $initrd_size + 9 + 12)
 
 echo "Apply command repeat test"
 xpass $BOOTCONF -a $TEMPCONF $INITRD
@@ -71,7 +71,6 @@ printf " \0\0\0 \0\0\0" >> $INITRD
 $BOOTCONF -a $TEMPCONF $INITRD > $OUTFILE 2>&1
 xfail grep -i "failed" $OUTFILE
 xfail grep -i "error" $OUTFILE
-rm $OUTFILE
 
 echo "Max node number check"
 
@@ -96,6 +95,19 @@ truncate -s 32764 $TEMPCONF
 echo "\"" >> $TEMPCONF	# add 2 bytes + terminal ('\"\n\0')
 xpass $BOOTCONF -a $TEMPCONF $INITRD
 
+echo "Adding same-key values"
+cat > $TEMPCONF << EOF
+key = bar, baz
+key += qux
+EOF
+echo > $INITRD
+
+xpass $BOOTCONF -a $TEMPCONF $INITRD
+$BOOTCONF $INITRD > $OUTFILE
+xpass grep -q "bar" $OUTFILE
+xpass grep -q "baz" $OUTFILE
+xpass grep -q "qux" $OUTFILE
+
 echo "=== expected failure cases ==="
 for i in samples/bad-* ; do
   xfail $BOOTCONF -a $i $INITRD