linux-kernel - [PATCH v2 1/1] uuid: Decouple guid_t and uuid

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Message-Id: <20230124133838.22645-1-andriy.shevchenko@linux.intel.com>
Date:   Tue, 24 Jan 2023 15:38:38 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v2 1/1] uuid: Decouple guid_t and uuid_le types and respective macros

The guid_t type and respective macros are being used internally only.
The uuid_le has its user outside the kernel. Decouple these types and
macros, and make guid_t completely internal type to the kernel.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: based on next/master to prevent compilation errors (LKP)
 
Supposed to go via Greg's driver/misc tree as necessary patches         
are there.

 MAINTAINERS               |  2 +-
 include/linux/uuid.h      | 20 ++++++++++++++++----
 include/uapi/linux/uuid.h | 12 ++++--------
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 5e18388b4579..b43991269fae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10429,6 +10429,7 @@ F:	drivers/watchdog/mei_wdt.c
 F:	include/linux/mei_aux.h
 F:	include/linux/mei_cl_bus.h
 F:	include/uapi/linux/mei.h
+F:	include/uapi/linux/uuid.h
 F:	samples/mei/*
 
 INTEL MAX 10 BMC MFD DRIVER
@@ -21731,7 +21732,6 @@ L:	linux-kernel@...r.kernel.org
 S:	Maintained
 T:	git git://git.infradead.org/users/hch/uuid.git
 F:	include/linux/uuid.h
-F:	include/uapi/linux/uuid.h
 F:	lib/test_uuid.c
 F:	lib/uuid.c
 
diff --git a/include/linux/uuid.h b/include/linux/uuid.h
index 8cdc0d3567cd..5be158a49e11 100644
--- a/include/linux/uuid.h
+++ b/include/linux/uuid.h
@@ -8,15 +8,25 @@
 #ifndef _LINUX_UUID_H_
 #define _LINUX_UUID_H_
 
-#include <uapi/linux/uuid.h>
 #include <linux/string.h>
 
 #define UUID_SIZE 16
 
+typedef struct {
+	__u8 b[UUID_SIZE];
+} guid_t;
+
 typedef struct {
 	__u8 b[UUID_SIZE];
 } uuid_t;
 
+#define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)			\
+((guid_t)								\
+{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
+   (b) & 0xff, ((b) >> 8) & 0xff,					\
+   (c) & 0xff, ((c) >> 8) & 0xff,					\
+   (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
+
 #define UUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)			\
 ((uuid_t)								\
 {{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \
@@ -97,10 +107,12 @@ extern const u8 uuid_index[16];
 int guid_parse(const char *uuid, guid_t *u);
 int uuid_parse(const char *uuid, uuid_t *u);
 
-/* backwards compatibility, don't use in new code */
-static inline int uuid_le_cmp(const guid_t u1, const guid_t u2)
+/* MEI UUID type, don't use anywhere else */
+#include <uapi/linux/uuid.h>
+
+static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2)
 {
-	return memcmp(&u1, &u2, sizeof(guid_t));
+	return memcmp(&u1, &u2, sizeof(uuid_le));
 }
 
 #endif
diff --git a/include/uapi/linux/uuid.h b/include/uapi/linux/uuid.h
index c0f4bd9b040e..96ac684a4b2f 100644
--- a/include/uapi/linux/uuid.h
+++ b/include/uapi/linux/uuid.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 /* DO NOT USE in new code! This is solely for MEI due to legacy reasons */
 /*
- * UUID/GUID definition
+ * MEI UUID definition
  *
  * Copyright (C) 2010, Intel Corp.
  *	Huang Ying <ying.huang@...el.com>
@@ -14,19 +14,15 @@
 
 typedef struct {
 	__u8 b[16];
-} guid_t;
+} uuid_le;
 
-#define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)			\
-((guid_t)								\
+#define UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)		\
+((uuid_le)								\
 {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
    (b) & 0xff, ((b) >> 8) & 0xff,					\
    (c) & 0xff, ((c) >> 8) & 0xff,					\
    (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
 
-/* backwards compatibility, don't use in new code */
-typedef guid_t uuid_le;
-#define UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)		\
-	GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)
 #define NULL_UUID_LE							\
 	UUID_LE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00,	\
 	     0x00, 0x00, 0x00, 0x00)

base-commit: a54df7622717a40ddec95fd98086aff8ba7839a6
-- 
2.39.0