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Linus Torvalds 60815cf2e0 kernel: Provide READ_ONCE and ASSIGN_ONCE ... As discussed on LKML http://marc.info/?i=54611D86.4040306%40de.ibm.com ACCESS_ONCE might fail with specific compilers for non-scalar accesses. Here is a set of patches to tackle that problem. The first patch introduce READ_ONCE and ASSIGN_ONCE. If the data structure is larger than the machine word size memcpy is used and a warning is emitted. The next patches fix up several in-tree users of ACCESS_ONCE on non-scalar types. This merge does not yet contain a patch that forces ACCESS_ONCE to work only on scalar types. This is targetted for the next merge window as Linux next already contains new offenders regarding ACCESS_ONCE vs. non-scalar types. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) iQIcBAABAgAGBQJUkrVGAAoJEBF7vIC1phx8stkP/2LmN5y6LOseoEW06xa5MX4m cbIKsZNtsGHl7EDcTzzuWs6Sq5/Cj7V3yzeBF7QGbUKOqvFWU3jvpUBCCfjMg37C 77/Vf0ZPrxTXXxeJ4Ykdy2CGvuMtuYY9TWkrRNKmLU0xex7lGblEzCt9z6+mZviw 26/DN8ctjkHRvIUAi+7RfQBBc3oSMYAC1mzxYKBAsAFLV+LyFmsGU/4iofZMAsdt XFyVXlrLn0Bjx/MeceGkOlMDiVx4FnfccfFaD4hhuTLBJXWitkUK/MRa4JBiXWzH agY8942A8/j9wkI2DFp/pqZYqA/sTXLndyOWlhE//ZSti0n0BSJaOx3S27rTLkAc 5VmZEVyIrS3hyOpyyAi0sSoPkDnjeCHmQg9Rqn34/poKLd7JDrW2UkERNCf/T3eh GI2rbhAlZz3v5mIShn8RrxzslWYmOObpMr3HYNUdRk8YUfTf6d6aZ3txHp2nP4mD VBAEzsvP9rcVT2caVhU2dnBzeaZAj3zeDxBtjcb3X2osY9tI7qgLc9Fa/fWKgILk 2evkLcctsae2mlLNGHyaK3Dm/ZmYJv+57MyaQQEZNfZZgeB1y4k0DkxH4w1CFmCi s8XlH5voEHgnyjSQXXgc/PNVlkPAKr78ZyTiAfiKmh8rpe41/W4hGcgao7L9Lgiu SI0uSwKibuZt4dHGxQuG =IQ5o -----END PGP SIGNATURE----- Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/borntraeger/linux Pull ACCESS_ONCE cleanup preparation from Christian Borntraeger: "kernel: Provide READ_ONCE and ASSIGN_ONCE As discussed on LKML http://marc.info/?i=54611D86.4040306%40de.ibm.com ACCESS_ONCE might fail with specific compilers for non-scalar accesses. Here is a set of patches to tackle that problem. The first patch introduce READ_ONCE and ASSIGN_ONCE. If the data structure is larger than the machine word size memcpy is used and a warning is emitted. The next patches fix up several in-tree users of ACCESS_ONCE on non-scalar types. This does not yet contain a patch that forces ACCESS_ONCE to work only on scalar types. This is targetted for the next merge window as Linux next already contains new offenders regarding ACCESS_ONCE vs. non-scalar types" * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/borntraeger/linux: s390/kvm: REPLACE barrier fixup with READ_ONCE arm/spinlock: Replace ACCESS_ONCE with READ_ONCE arm64/spinlock: Replace ACCESS_ONCE READ_ONCE mips/gup: Replace ACCESS_ONCE with READ_ONCE x86/gup: Replace ACCESS_ONCE with READ_ONCE x86/spinlock: Replace ACCESS_ONCE with READ_ONCE mm: replace ACCESS_ONCE with READ_ONCE or barriers kernel: Provide READ_ONCE and ASSIGN_ONCE		10 years ago
..
alpha	arch: Cleanup read_barrier_depends() and comments	10 years ago
arc	Minor updates for ARC for 3.19	10 years ago
arm	kernel: Provide READ_ONCE and ASSIGN_ONCE	10 years ago
arm64	kernel: Provide READ_ONCE and ASSIGN_ONCE	10 years ago
avr32	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	10 years ago
blackfin	TTY/Serial driver patches for 3.19-rc1	10 years ago
c6x	net, lib: kill arch_fast_hash library bits	10 years ago
cris	CRISv32: Remove last remnants of ETRAX_SPI_MMC_BOARD	10 years ago
frv	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	10 years ago
hexagon	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rkuo/linux-hexagon-kernel	10 years ago
ia64	__get_cpu_var removed from rest of tree, drop reference from comments in arch/ia64	10 years ago
m32r	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	10 years ago
m68k	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	10 years ago
metag	arch: Add lightweight memory barriers dma_rmb() and dma_wmb()	10 years ago
microblaze	Microblaze patches for 3.19-rc1	10 years ago
mips	kernel: Provide READ_ONCE and ASSIGN_ONCE	10 years ago
mn10300	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	10 years ago
nios2	nios2/uaccess: fix sparse errors	10 years ago
openrisc	net, lib: kill arch_fast_hash library bits	10 years ago
parisc	parisc: percpu: update comments referring to __get_cpu_var	10 years ago
powerpc	CONFIG_PM_RUNTIME elimination for 3.19-rc1	10 years ago
s390	kernel: Provide READ_ONCE and ASSIGN_ONCE	10 years ago
score	net, lib: kill arch_fast_hash library bits	10 years ago
sh	PM: Eliminate CONFIG_PM_RUNTIME	10 years ago
sparc	sparc32: destroy_context() and switch_mm() needs to disable interrupts.	10 years ago
tile	Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile	10 years ago
um	TTY/Serial driver patches for 3.19-rc1	10 years ago
unicore32	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	10 years ago
x86	kernel: Provide READ_ONCE and ASSIGN_ONCE	10 years ago
xtensa	Xtensa fixes for 3.19:	10 years ago
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