linux-kernel - [v4.9 PATCH 1/6] include/uapi/linux/swab.h: fix userspace breakage, use __BITS_PER

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Message-Id: <20220731182635.1910069-2-hegtvedt@cisco.com>
Date:   Sun, 31 Jul 2022 20:26:31 +0200
From:   Hans-Christian Noren Egtvedt <hegtvedt@...co.com>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Yury Norov <yury.norov@...il.com>,
        Allison Randal <allison@...utok.net>,
        Joe Perches <joe@...ches.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Torsten Hilbrich <torsten.hilbrich@...unet.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [v4.9 PATCH 1/6] include/uapi/linux/swab.h: fix userspace breakage, use __BITS_PER_LONG for swap

From: Christian Borntraeger <borntraeger@...ibm.com>

QEMU has a funny new build error message when I use the upstream kernel
headers:

      CC      block/file-posix.o
    In file included from /home/cborntra/REPOS/qemu/include/qemu/timer.h:4,
                     from /home/cborntra/REPOS/qemu/include/qemu/timed-average.h:29,
                     from /home/cborntra/REPOS/qemu/include/block/accounting.h:28,
                     from /home/cborntra/REPOS/qemu/include/block/block_int.h:27,
                     from /home/cborntra/REPOS/qemu/block/file-posix.c:30:
    /usr/include/linux/swab.h: In function `__swab':
    /home/cborntra/REPOS/qemu/include/qemu/bitops.h:20:34: error: "sizeof" is not defined, evaluates to 0 [-Werror=undef]
       20 | #define BITS_PER_LONG           (sizeof (unsigned long) * BITS_PER_BYTE)
          |                                  ^~~~~~
    /home/cborntra/REPOS/qemu/include/qemu/bitops.h:20:41: error: missing binary operator before token "("
       20 | #define BITS_PER_LONG           (sizeof (unsigned long) * BITS_PER_BYTE)
          |                                         ^
    cc1: all warnings being treated as errors
    make: *** [/home/cborntra/REPOS/qemu/rules.mak:69: block/file-posix.o] Error 1
    rm tests/qemu-iotests/socket_scm_helper.o

This was triggered by commit d5767057c9a ("uapi: rename ext2_swab() to
swab() and share globally in swab.h").  That patch is doing

  #include <asm/bitsperlong.h>

but it uses BITS_PER_LONG.

The kernel file asm/bitsperlong.h provide only __BITS_PER_LONG.

Let us use the __ variant in swap.h

Link: http://lkml.kernel.org/r/20200213142147.17604-1-borntraeger@de.ibm.com
Fixes: d5767057c9a ("uapi: rename ext2_swab() to swab() and share globally in swab.h")
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Yury Norov <yury.norov@...il.com>
Cc: Allison Randal <allison@...utok.net>
Cc: Joe Perches <joe@...ches.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: William Breathitt Gray <vilhelm.gray@...il.com>
Cc: Torsten Hilbrich <torsten.hilbrich@...unet.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
(cherry picked from commit 467d12f5c7842896d2de3ced74e4147ee29e97c8)
---
 include/uapi/linux/swab.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/swab.h b/include/uapi/linux/swab.h
index 1f42d110987..51502eabdb0 100644
--- a/include/uapi/linux/swab.h
+++ b/include/uapi/linux/swab.h
@@ -134,9 +134,9 @@ static inline __attribute_const__ __u32 __fswahb32(__u32 val)
 
 static __always_inline unsigned long __swab(const unsigned long y)
 {
-#if BITS_PER_LONG == 64
+#if __BITS_PER_LONG == 64
 	return __swab64(y);
-#else /* BITS_PER_LONG == 32 */
+#else /* __BITS_PER_LONG == 32 */
 	return __swab32(y);
 #endif
 }
-- 
2.34.1