Commit 942fa985 authored by Yury Norov's avatar Yury Norov Committed by Arnd Bergmann
Browse files

32-bit userspace ABI: introduce ARCH_32BIT_OFF_T config option 



All new 32-bit architectures should have 64-bit userspace off_t type, but
existing architectures has 32-bit ones.

To enforce the rule, new config option is added to arch/Kconfig that defaults
ARCH_32BIT_OFF_T to be disabled for new 32-bit architectures. All existing
32-bit architectures enable it explicitly.

New option affects force_o_largefile() behaviour. Namely, if userspace
off_t is 64-bits long, we have no reason to reject user to open big files.

Note that even if architectures has only 64-bit off_t in the kernel
(arc, c6x, h8300, hexagon, nios2, openrisc, and unicore32),
a libc may use 32-bit off_t, and therefore want to limit the file size
to 4GB unless specified differently in the open flags.

Signed-off-by: default avatarYury Norov <ynorov@caviumnetworks.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarYury Norov <ynorov@marvell.com>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 0d0216c0

arch/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -276,6 +276,16 @@ config ARCH_THREAD_STACK_ALLOCATOR 
config ARCH_WANTS_DYNAMIC_TASK_STRUCT

	bool



config ARCH_32BIT_OFF_T

	bool

	depends on !64BIT

	help

	  All new 32-bit architectures should have 64-bit off_t type on

	  userspace side which corresponds to the loff_t kernel type. This

	  is the requirement for modern ABIs. Some existing architectures

	  still support 32-bit off_t. This option is enabled for all such

	  architectures explicitly.



config HAVE_REGS_AND_STACK_ACCESS_API

	bool

	help

arch/arc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ config ARC 
	select ARCH_HAS_SYNC_DMA_FOR_CPU

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC

	select ARCH_32BIT_OFF_T

	select BUILDTIME_EXTABLE_SORT

	select CLONE_BACKWARDS

	select COMMON_CLK

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
config ARM

	bool

	default y

	select ARCH_32BIT_OFF_T

	select ARCH_CLOCKSOURCE_DATA

	select ARCH_DISCARD_MEMBLOCK if !HAVE_ARCH_PFN_VALID && !KEXEC

	select ARCH_HAS_DEBUG_VIRTUAL if MMU

arch/c6x/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 


config C6X

	def_bool y

	select ARCH_32BIT_OFF_T

	select ARCH_HAS_SYNC_DMA_FOR_CPU

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select CLKDEV_LOOKUP

arch/csky/Kconfig

+1 −0
Original line number Diff line number Diff line 
config CSKY

	def_bool y

	select ARCH_32BIT_OFF_T

	select ARCH_HAS_SYNC_DMA_FOR_CPU

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select ARCH_USE_BUILTIN_BSWAP

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