Adjust log levels of /proc/cpuinfo parsing

There are a few steps in our parsing logic where we skip lines that
don't match the expectations of the /proc/cpuinfo node. Reduce the log
level of these lines to 'debug', as these are not generally errors and
are noisy on systems that have unique cpuinfo key-value pairs.

When parsing logic encounters a higher-than-expected processor number,
increase the level to warning, to indicate that an error may have
occurred in the parsing step.

src/arm/linux/cpuinfo.c

@@ -742,7 +742,7 @@ static bool parse_line(
 	}
 	/* Skip line if no ':' separator was found. */
 	if (separator == line_end) {
-		cpuinfo_log_info(
+		cpuinfo_log_debug(
 			"Line %.*s in /proc/cpuinfo is ignored: key/value separator ':' not found",
 			(int)(line_end - line_start),
 			line_start);
@@ -758,7 +758,7 @@ static bool parse_line(
 	}
 	/* Skip line if key contains nothing but spaces. */
 	if (key_end == line_start) {
-		cpuinfo_log_info(
+		cpuinfo_log_debug(
 			"Line %.*s in /proc/cpuinfo is ignored: key contains only spaces",
 			(int)(line_end - line_start),
 			line_start);
@@ -774,7 +774,7 @@ static bool parse_line(
 	}
 	/* Value part contains nothing but spaces. Skip line. */
 	if (value_start == line_end) {
-		cpuinfo_log_info(
+		cpuinfo_log_debug(
 			"Line %.*s in /proc/cpuinfo is ignored: value contains only spaces",
 			(int)(line_end - line_start),
 			line_start);
@@ -873,7 +873,7 @@ static bool parse_line(
 			} else if (memcmp(line_start, "Hardware", key_length) == 0) {
 				size_t value_length = value_end - value_start;
 				if (value_length > CPUINFO_HARDWARE_VALUE_MAX) {
-					cpuinfo_log_info(
+					cpuinfo_log_debug(
 						"length of Hardware value \"%.*s\" in /proc/cpuinfo exceeds limit (%d): truncating to the limit",
 						(int)value_length,
 						value_start,
@@ -888,7 +888,7 @@ static bool parse_line(
 			} else if (memcmp(line_start, "Revision", key_length) == 0) {
 				size_t value_length = value_end - value_start;
 				if (value_length > CPUINFO_REVISION_VALUE_MAX) {
-					cpuinfo_log_info(
+					cpuinfo_log_debug(
 						"length of Revision value \"%.*s\" in /proc/cpuinfo exceeds limit (%d): truncating to the limit",
 						(int)value_length,
 						value_start,
@@ -918,7 +918,7 @@ static bool parse_line(
 				} else if (new_processor_index > processor_index + 1) {
 					/* Strange, but common: skipped
 					 * processor $(processor_index + 1) */
-					cpuinfo_log_info(
+					cpuinfo_log_warning(
 						"unexpectedly high processor number %" PRIu32
 						" following processor %" PRIu32 " in /proc/cpuinfo",
 						new_processor_index,

src/x86/linux/cpuinfo.c

@@ -99,7 +99,7 @@ static bool parse_line(
 	}
 	/* Skip line if no ':' separator was found. */
 	if (separator == line_end) {
-		cpuinfo_log_info(
+		cpuinfo_log_debug(
 			"Line %.*s in /proc/cpuinfo is ignored: key/value separator ':' not found",
 			(int)(line_end - line_start),
 			line_start);
@@ -115,7 +115,7 @@ static bool parse_line(
 	}
 	/* Skip line if key contains nothing but spaces. */
 	if (key_end == line_start) {
-		cpuinfo_log_info(
+		cpuinfo_log_debug(
 			"Line %.*s in /proc/cpuinfo is ignored: key contains only spaces",
 			(int)(line_end - line_start),
 			line_start);
@@ -131,7 +131,7 @@ static bool parse_line(
 	}
 	/* Value part contains nothing but spaces. Skip line. */
 	if (value_start == line_end) {
-		cpuinfo_log_info(
+		cpuinfo_log_debug(
 			"Line %.*s in /proc/cpuinfo is ignored: value contains only spaces",
 			(int)(line_end - line_start),
 			line_start);
@@ -177,7 +177,7 @@ static bool parse_line(
 				} else if (new_processor_index > processor_index + 1) {
 					/* Strange, but common: skipped
 					 * processor $(processor_index + 1) */
-					cpuinfo_log_info(
+					cpuinfo_log_warning(
 						"unexpectedly high processor number %" PRIu32
 						" following processor %" PRIu32 " in /proc/cpuinfo",
 						new_processor_index,