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authorYury Norov <ynorov@caviumnetworks.com>2018-05-16 11:18:49 +0300
committerArnd Bergmann <arnd@arndb.de>2019-02-19 10:10:05 +0100
commit942fa985e9f161ac018ce2230d3e6f7668cca6ac (patch)
treec4f0d0fead0b4a0af0a1f6ecf87d8f79295b9485 /arch/Kconfig
parentcompat ABI: use non-compat openat and open_by_handle_at variants (diff)
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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 '')
-rw-r--r--arch/Kconfig10
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