[PATCH 02/20] 32-bit ABI: introduce ARCH_32BIT_OFF_T config option

From: Yury Norov <hidden>
Date: 2017-01-09 11:37:38
Also in: lkml
Subsystem: arm port, file locking (flock() and fcntl()/lockf()), linux for powerpc (32-bit and 64-bit), m68k architecture, microblaze architecture, mips, nios2 architecture, openrisc architecture, parisc architecture, qualcomm hexagon architecture, sparc + ultrasparc (sparc/sparc64), superh, synopsys arc architecture, tensilica xtensa port (xtensa), the rest, user-mode linux (uml), x86 architecture (32-bit and 64-bit) · Maintainers: Russell King, Jeff Layton, Chuck Lever, Madhavan Srinivasan, Michael Ellerman, Geert Uytterhoeven, Michal Simek, Thomas Bogendoerfer, Dinh Nguyen, Simon Schuster, Jonas Bonn, Stefan Kristiansson, Stafford Horne, "James E.J. Bottomley", Helge Deller, Brian Cain, "David S. Miller", Andreas Larsson, Yoshinori Sato, Rich Felker, John Paul Adrian Glaubitz, Vineet Gupta, Chris Zankel, Max Filippov, Linus Torvalds, Richard Weinberger, Anton Ivanov, Johannes Berg, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen

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

To handle it, new config option is added to arch/Kconfig that defaults
ARCH_32BIT_OFF_T to be disabled for non-64 bit architectures. All existing
32-bit architectures enable it explicitly here.

New option affects force_o_largefile() behaviour. Namely, if 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, metag, nios2, openrisc, tile32 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 <redacted>
---
 arch/Kconfig            | 4 ++++
 arch/arc/Kconfig        | 1 +
 arch/arm/Kconfig        | 1 +
 arch/blackfin/Kconfig   | 1 +
 arch/cris/Kconfig       | 1 +
 arch/frv/Kconfig        | 1 +
 arch/h8300/Kconfig      | 1 +
 arch/hexagon/Kconfig    | 1 +
 arch/m32r/Kconfig       | 1 +
 arch/m68k/Kconfig       | 1 +
 arch/metag/Kconfig      | 1 +
 arch/microblaze/Kconfig | 1 +
 arch/mips/Kconfig       | 1 +
 arch/mn10300/Kconfig    | 1 +
 arch/nios2/Kconfig      | 1 +
 arch/openrisc/Kconfig   | 1 +
 arch/parisc/Kconfig     | 1 +
 arch/powerpc/Kconfig    | 1 +
 arch/score/Kconfig      | 1 +
 arch/sh/Kconfig         | 1 +
 arch/sparc/Kconfig      | 1 +
 arch/tile/Kconfig       | 1 +
 arch/unicore32/Kconfig  | 1 +
 arch/x86/Kconfig        | 1 +
 arch/x86/um/Kconfig     | 1 +
 arch/xtensa/Kconfig     | 1 +
 include/linux/fcntl.h   | 2 +-
 27 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 89e0b4f..051c21c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig

@@ -238,6 +238,10 @@ config ARCH_THREAD_STACK_ALLOCATOR
 config ARCH_WANTS_DYNAMIC_TASK_STRUCT
 	bool
 
+config ARCH_32BIT_OFF_T
+	bool
+	depends on !64BIT
+
 config HAVE_REGS_AND_STACK_ACCESS_API
 	bool
 	help

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index c75d290..9b92f65 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig

@@ -11,6 +11,7 @@ config ARC
 	select ARC_TIMERS
 	select ARCH_HAS_SG_CHAIN
 	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 186c4c2..fcbd177 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -1,6 +1,7 @@
 config ARM
 	bool
 	default y
+	select ARCH_32BIT_OFF_T
 	select ARCH_CLOCKSOURCE_DATA
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 3c1bd64..26418e7 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig

@@ -12,6 +12,7 @@ config RWSEM_XCHGADD_ALGORITHM
 
 config BLACKFIN
 	def_bool y
+	select ARCH_32BIT_OFF_T
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_DYNAMIC_FTRACE

diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index 71b758d..8c059f0 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig

@@ -50,6 +50,7 @@ config LOCKDEP_SUPPORT
 config CRIS
 	bool
 	default y
+	select ARCH_32BIT_OFF_T
 	select HAVE_IDE
 	select GENERIC_ATOMIC64
 	select HAVE_UID16

diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index eefd9a4..2f14904 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig

@@ -1,6 +1,7 @@
 config FRV
 	bool
 	default y
+	select ARCH_32BIT_OFF_T
 	select HAVE_IDE
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_PERF_EVENTS

diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 3ae8525..29bbcb1 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig

@@ -1,5 +1,6 @@
 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 1941e4b..bbcea8c 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig

@@ -3,6 +3,7 @@ comment "Linux Kernel Configuration for Hexagon"
 
 config HEXAGON
 	def_bool y
+	select ARCH_32BIT_OFF_T
 	select HAVE_OPROFILE
 	# Other pending projects/to-do items.
 	# select HAVE_REGS_AND_STACK_ACCESS_API

diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index d227a69..ff34dc5 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig

@@ -1,6 +1,7 @@
 config M32R
 	bool
 	default y
+	select ARCH_32BIT_OFF_T
 	select HAVE_IDE
 	select HAVE_OPROFILE
 	select INIT_ALL_POSSIBLE

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index d140206..ed6f90c 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig

@@ -1,6 +1,7 @@
 config M68K
 	bool
 	default y
+	select ARCH_32BIT_OFF_T
 	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
 	select HAVE_IDE
 	select HAVE_AOUT if MMU

diff --git a/arch/metag/Kconfig b/arch/metag/Kconfig
index 5b7a45d..c337192 100644
--- a/arch/metag/Kconfig
+++ b/arch/metag/Kconfig

@@ -1,5 +1,6 @@
 config METAG
 	def_bool y
+	select ARCH_32BIT_OFF_T
 	select EMBEDDED
 	select GENERIC_ATOMIC64
 	select GENERIC_CLOCKEVENTS

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 85885a5..643025c 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig

@@ -1,5 +1,6 @@
 config MICROBLAZE
 	def_bool y
+	select ARCH_32BIT_OFF_T
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_WANT_IPC_PARSE_VERSION

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ffd2f67..1b971ac 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig

@@ -1,6 +1,7 @@
 config MIPS
 	bool
 	default y
+	select ARCH_32BIT_OFF_T if !64BIT
 	select ARCH_SUPPORTS_UPROBES
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO

diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 38e3494..75f226e 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig

@@ -1,5 +1,6 @@
 config MN10300
 	def_bool y
+	select ARCH_32BIT_OFF_T
 	select HAVE_EXIT_THREAD
 	select HAVE_OPROFILE
 	select HAVE_UID16

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 51a56c8..f9273c9 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig

@@ -1,5 +1,6 @@
 config NIOS2
 	def_bool y
+	select ARCH_32BIT_OFF_T
 	select CLKSRC_OF
 	select GENERIC_ATOMIC64
 	select GENERIC_CLOCKEVENTS

diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 8d22015..4641d67 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig

@@ -5,6 +5,7 @@
 
 config OPENRISC
 	def_bool y
+	select ARCH_32BIT_OFF_T
 	select OF
 	select OF_EARLY_FLATTREE
 	select IRQ_DOMAIN

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 3a71f38..dc85602 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig

@@ -1,5 +1,6 @@
 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 a8ee573..0714461 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig

@@ -80,6 +80,7 @@ config ARCH_HAS_DMA_SET_COHERENT_MASK
 config PPC
 	bool
 	default y
+	select ARCH_32BIT_OFF_T if PPC32
 	select BUILDTIME_EXTABLE_SORT
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO

diff --git a/arch/score/Kconfig b/arch/score/Kconfig
index 507d631..0a9484b 100644
--- a/arch/score/Kconfig
+++ b/arch/score/Kconfig

@@ -2,6 +2,7 @@ menu "Machine selection"
 
 config SCORE
        def_bool y
+       select ARCH_32BIT_OFF_T
        select GENERIC_IRQ_SHOW
        select GENERIC_IOMAP
        select GENERIC_ATOMIC64

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index ee08695..1f99eb3 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig

@@ -56,6 +56,7 @@ 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 cf4034c..1ab0df5 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig

@@ -47,6 +47,7 @@ config SPARC
 
 config SPARC32
 	def_bool !64BIT
+	select ARCH_32BIT_OFF_T
 	select GENERIC_ATOMIC64
 	select CLZ_TAB
 	select HAVE_UID16

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 4583c03..845dcbd 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig

@@ -3,6 +3,7 @@
 
 config TILE
 	def_bool y
+	select ARCH_32BIT_OFF_T if !64BIT
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select ARCH_WANT_FRAME_POINTERS

diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 0a3bfd1..9629fd8 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig

@@ -1,5 +1,6 @@
 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 e487493..af5988c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig

@@ -43,6 +43,7 @@ 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_DISCARD_MEMBLOCK
 	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI

diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index ed56a1c..8436bcd 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig

@@ -21,6 +21,7 @@ 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 f4126cf..683f24e 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig

@@ -3,6 +3,7 @@ config ZONE_DMA
 
 config XTENSA
 	def_bool y
+	select ARCH_32BIT_OFF_T
 	select ARCH_WANT_FRAME_POINTERS
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select BUILDTIME_EXTABLE_SORT

diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
index 76ce329..46960a1 100644
--- a/include/linux/fcntl.h
+++ b/include/linux/fcntl.h

@@ -5,7 +5,7 @@
 
 
 #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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