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| author | Yury Norov <ynorov@caviumnetworks.com> | 2018-05-16 11:18:49 +0300 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2019-02-19 10:10:05 +0100 |
| commit | 942fa985e9f161ac018ce2230d3e6f7668cca6ac (patch) | |
| tree | c4f0d0fead0b4a0af0a1f6ecf87d8f79295b9485 /arch/Kconfig | |
| parent | 0d0216c03a7a14e121abb2e3eb38e491767c36e8 (diff) | |
| download | lwn-942fa985e9f161ac018ce2230d3e6f7668cca6ac.tar.gz lwn-942fa985e9f161ac018ce2230d3e6f7668cca6ac.zip | |
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>
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 46db715a7f42..cd5f443865ec 100644 --- 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 |