The patch titled Subject: locking/qrwlock: include asm/byteorder.h as needed has been added to the -mm tree. Its filename is locking-qrwlock-include-asm-byteorderh-as-needed.patch

This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/locking-qrwlock-include-asm-byteord... and later at http://ozlabs.org/~akpm/mmotm/broken-out/locking-qrwlock-include-asm-byteord...

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------------------------------------------------------ From: Arnd Bergmann arnd@arndb.de Subject: locking/qrwlock: include asm/byteorder.h as needed

Moving the qrwlock struct definition into a header file introduced a subtle bug on all little-endian machines, where some files in some configurations would see the fields in an incorrect order. This was found by building with an LTO enabled compiler that warns every time we try to link together files with incompatible data structures.

A second patch changes linux/kconfig.h to always define the symbols, but this seems to be the root cause of most of the issues, so I'd suggest we do both.

On a current linux-next kernel, I verified that this header is responsible for all type mismatches as a result from the endianess confusion.

Link: http://lkml.kernel.org/r/20180202154104.1522809-1-arnd@arndb.de Fixes: e0d02285f16e ("locking/qrwlock: Use 'struct qrwlock' instead of 'struct __qrwlock'") Signed-off-by: Arnd Bergmann arnd@arndb.de Cc: Will Deacon will.deacon@arm.com Cc: Peter Zijlstra peterz@infradead.org Cc: Nicolas Pitre nico@linaro.org Cc: Andi Kleen ak@linux.intel.com Cc: Babu Moger babu.moger@oracle.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Thomas Gleixner tglx@linutronix.de Cc: Masahiro Yamada yamada.masahiro@socionext.com Cc: stable@vger.kernel.org

Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

include/asm-generic/qrwlock_types.h | 1 + 1 file changed, 1 insertion(+)

diff -puN include/asm-generic/qrwlock_types.h~locking-qrwlock-include-asm-byteorderh-as-needed include/asm-generic/qrwlock_types.h --- a/include/asm-generic/qrwlock_types.h~locking-qrwlock-include-asm-byteorderh-as-needed +++ a/include/asm-generic/qrwlock_types.h @@ -3,6 +3,7 @@ #define __ASM_GENERIC_QRWLOCK_TYPES_H

#include <linux/types.h> +#include <asm/byteorder.h> #include <asm/spinlock_types.h>

/* _

Patches currently in -mm which might be from arnd@arndb.de are

locking-qrwlock-include-asm-byteorderh-as-needed.patch kbuild-always-define-endianess-in-kconfigh.patch kasan-added-functions-for-unpoisoning-stack-variables-fix-fix.patch bugh-work-around-gcc-pr82365-in-bug.patch bitmap-replace-bitmap_fromto_u32array-fix.patch nilfs2-use-time64_t-internally.patch pps-parport-use-timespec64-instead-of-timespec.patch kasan-rework-kconfig-settings.patch