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: Yury Norov <ynorov@caviumnetworks.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Yury Norov <ynorov@marvell.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/Kconfig b/arch/Kconfig
index 46db715..cd5f443 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -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

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 376366a..1cfe419 100644 (file)
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -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

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 664e918..8933f73 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -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

diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
index 456e154..e5cd3c5 100644 (file)
--- a/arch/c6x/Kconfig
+++ b/arch/c6x/Kconfig
@@ -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

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 398113c..6959e0b 100644 (file)
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -1,5 +1,6 @@
 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

diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 6472a06..c071da3 100644 (file)
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -1,6 +1,7 @@
 # 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

diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index fb2fbfc..ac44168 100644 (file)
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -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

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index e173ea2..b542064 100644 (file)
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -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

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 58aff26..a51b965 100644 (file)
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -1,5 +1,6 @@
 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

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 7872907..d80ccab 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -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

diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index dda1906..addb7f5 100644 (file)
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@@ -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

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 532343e..c3e913e 100644 (file)
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -1,6 +1,7 @@
 # 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

diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 09ab59e..a5e361f 100644 (file)
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -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

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 7ca2c3e..c8e6212 100644 (file)
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -1,6 +1,7 @@
 # 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

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2890d36..375d0dc 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -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

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index feeeaa6..09fa3a8 100644 (file)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -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

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index a9c36f9..d9a9144 100644 (file)
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -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

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index d5dd652..40f8f4f 100644 (file)
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -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

diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index c3a41bf..a7f1ae5 100644 (file)
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -1,6 +1,7 @@
 # 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

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 15af091..7aac274 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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

diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index f518b47..ab14e6f 100644 (file)
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -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

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 20a0756..2033b44 100644 (file)
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -1,6 +1,7 @@
 # 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

diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
index 27dc7a6..d019df9 100644 (file)
--- a/include/linux/fcntl.h
+++ b/include/linux/fcntl.h
@@ -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