linux-kernel - [PATCH blktrace v3 13/20] blktrace: pass magic to CHECK

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Message-ID: <20251015105658.527262-14-johannes.thumshirn@wdc.com>
Date: Wed, 15 Oct 2025 12:56:51 +0200
From: Johannes Thumshirn <johannes.thumshirn@....com>
To: axboe@...nel.dk
Cc: chaitanyak@...dia.com,
	dlemoal@...nel.org,
	hare@...e.de,
	hch@....de,
	john.g.garry@...cle.com,
	linux-block@...r.kernel.org,
	linux-btrace@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	martin.petersen@...cle.com,
	mathieu.desnoyers@...icios.com,
	mhiramat@...nel.org,
	naohiro.aota@....com,
	rostedt@...dmis.org,
	shinichiro.kawasaki@....com,
	Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH blktrace v3 13/20] blktrace: pass magic to CHECK_MAGIC macro

Pass only the magic number itself to the CHECK_MAGIC() macro.

This enables support for multiple versions.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
 blkrawverify.c | 2 +-
 blktrace.h     | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/blkrawverify.c b/blkrawverify.c
index 9c5d595..cc5b06e 100644
--- a/blkrawverify.c
+++ b/blkrawverify.c
@@ -183,7 +183,7 @@ static int process(FILE **fp, char *devname, char *file, unsigned int cpu)
 
 		trace_to_cpu(bit);
 
-		if (!CHECK_MAGIC(bit)) {
+		if (!CHECK_MAGIC(bit->magic)) {
 			INC_BAD("bad trace");
 			continue;
 		}
diff --git a/blktrace.h b/blktrace.h
index 3305fa0..81a5b51 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -67,7 +67,7 @@ extern FILE *ofp;
 extern int data_is_native;
 extern struct timespec abs_start_time;
 
-#define CHECK_MAGIC(t)		(((t)->magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
+#define CHECK_MAGIC(magic)		(((magic) & 0xffffff00) == BLK_IO_TRACE_MAGIC)
 #define SUPPORTED_VERSION	(0x07)
 #define SUPPORTED_VERSION2	(0x08)
 
@@ -93,7 +93,7 @@ static inline int verify_trace(struct blk_io_trace *t)
 {
 	u8 version;
 
-	if (!CHECK_MAGIC(t)) {
+	if (!CHECK_MAGIC(t->magic)) {
 		fprintf(stderr, "bad trace magic %x\n", t->magic);
 		return 1;
 	}
-- 
2.51.0