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

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
......@@ -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
......
......@@ -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
......
......@@ -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
......
......@@ -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
......
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
......
# SPDX-License-Identifier: GPL-2.0
config H8300
def_bool y
select ARCH_32BIT_OFF_T
select GENERIC_ATOMIC64
select HAVE_UID16
select VIRT_TO_BUS
......
......@@ -4,6 +4,7 @@ comment "Linux Kernel Configuration for Hexagon"
config HEXAGON
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_NO_PREEMPT
select HAVE_OPROFILE
......
......@@ -2,6 +2,7 @@
config M68K
bool
default y
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA
select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
select ARCH_NO_COHERENT_DMA_MMAP if !MMU
......
config MICROBLAZE
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_NO_SWAP
select ARCH_HAS_DMA_COHERENT_TO_PFN if MMU
select ARCH_HAS_GCOV_PROFILE_ALL
......
......@@ -2,6 +2,7 @@
config MIPS
bool
default y
select ARCH_32BIT_OFF_T if !64BIT
select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT
select ARCH_CLOCKSOURCE_DATA
select ARCH_DISCARD_MEMBLOCK
......
......@@ -5,6 +5,7 @@
config NDS32
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_WANT_FRAME_POINTERS if FTRACE
......
# SPDX-License-Identifier: GPL-2.0
config NIOS2
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_NO_SWAP
......
......@@ -6,6 +6,7 @@
config OPENRISC
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select OF
select OF_EARLY_FLATTREE
......
# SPDX-License-Identifier: GPL-2.0
config PARISC
def_bool y
select ARCH_32BIT_OFF_T if !64BIT
select ARCH_MIGHT_HAVE_PC_PARPORT
select HAVE_IDE
select HAVE_OPROFILE
......
......@@ -128,6 +128,7 @@ config PPC
#
# Please keep this list sorted alphabetically.
#
select ARCH_32BIT_OFF_T if PPC32
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_DMA_SET_COHERENT_MASK
......
......@@ -11,6 +11,7 @@ config 32BIT
config RISCV
def_bool y
select ARCH_32BIT_OFF_T if !64BIT
# even on 32-bit, physical (and DMA) addresses are > 32-bits
select PHYS_ADDR_T_64BIT
select OF
......
......@@ -62,6 +62,7 @@ config SUPERH
config SUPERH32
def_bool "$(ARCH)" = "sh"
select ARCH_32BIT_OFF_T
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_IOREMAP_PROT if MMU && !X2TLB
......
......@@ -49,6 +49,7 @@ config SPARC
config SPARC32
def_bool !64BIT
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_CPU
select GENERIC_ATOMIC64
select CLZ_TAB
......
# SPDX-License-Identifier: GPL-2.0
config UNICORE32
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
......
......@@ -47,6 +47,7 @@ config X86
select ACPI_LEGACY_TABLES_LOOKUP if ACPI
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
select ANON_INODES
select ARCH_32BIT_OFF_T if X86_32
select ARCH_CLOCKSOURCE_DATA
select ARCH_CLOCKSOURCE_INIT
select ARCH_DISCARD_MEMBLOCK
......
......@@ -17,6 +17,7 @@ config 64BIT
config X86_32
def_bool !64BIT
select HAVE_AOUT
select ARCH_32BIT_OFF_T
select ARCH_WANT_IPC_PARSE_VERSION
select MODULES_USE_ELF_REL
select CLONE_BACKWARDS
......
# SPDX-License-Identifier: GPL-2.0
config XTENSA
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_NO_COHERENT_DMA_MMAP if !MMU
......
......@@ -12,7 +12,7 @@
O_NOATIME | O_CLOEXEC | O_PATH | __O_TMPFILE)
#ifndef force_o_largefile
#define force_o_largefile() (BITS_PER_LONG != 32)
#define force_o_largefile() (!IS_ENABLED(CONFIG_ARCH_32BIT_OFF_T))
#endif
#if BITS_PER_LONG == 32
......
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