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asm-generic: reverse GENERIC_{STRNCPY_FROM,STRNLEN}_USER symbols

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Most architectures do not need a custom implementation, and in most
cases the generic implementation is preferred, so change the polariy
on these Kconfig symbols to require architectures to select them when
they provide their own version.

The new name is CONFIG_ARCH_HAS_{STRNCPY_FROM,STRNLEN}_USER.

The remaining architectures at the moment are: ia64, mips, parisc,
um and xtensa. We should probably convert these as well, but
I was not sure how far to take this series. Thomas Bogendoerfer
had some concerns about converting mips but may still do some
more detailed measurements to see which version is better.

Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: linux-ia64@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: linux-s390@vger.kernel.org
Cc: linux-um@lists.infradead.org
Cc: linux-xtensa@linux-xtensa.org
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Helge Deller <deller@gmx.de> # parisc
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2021-05-17 09:22:34 +02:00
parent 166ec4633b
commit e6226997ec
26 changed files with 19 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/Kconfig
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@ -29,8 +29,6 @@ config ALPHA
select AUDIT_ARCH
select GENERIC_CPU_VULNERABILITIES
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_ARCH_AUDITSYSCALL
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA

2
arch/arc/Kconfig
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@ -27,8 +27,6 @@ config ARC
select GENERIC_PENDING_IRQ if SMP
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4

2
arch/arm/Kconfig
View File

@ -63,8 +63,6 @@ config ARM
select GENERIC_PCI_IOMAP
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HANDLE_DOMAIN_IRQ
select HARDIRQS_SW_RESEND
select HAVE_ARCH_AUDITSYSCALL if AEABI && !OABI_COMPAT

2
arch/arm64/Kconfig
View File

@ -130,8 +130,6 @@ config ARM64
select GENERIC_PTDUMP
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select GENERIC_GETTIMEOFDAY
select GENERIC_VDSO_TIME_NS

2
arch/csky/Kconfig
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@ -35,8 +35,6 @@ config CSKY
select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select GENERIC_VDSO_32
select GENERIC_GETTIMEOFDAY

2
arch/h8300/Kconfig
View File

@ -11,8 +11,6 @@ config H8300
select GENERIC_IRQ_SHOW
select FRAME_POINTER
select GENERIC_CPU_DEVICES
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select MODULES_USE_ELF_RELA
select COMMON_CLK
select ARCH_WANT_FRAME_POINTERS

2
arch/hexagon/Kconfig
View File

@ -19,8 +19,6 @@ config HEXAGON
# GENERIC_ALLOCATOR is used by dma_alloc_coherent()
select GENERIC_ALLOCATOR
select GENERIC_IRQ_SHOW
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
select NEED_SG_DMA_LENGTH

2
arch/ia64/Kconfig
View File

@ -9,6 +9,8 @@ menu "Processor type and features"
config IA64
bool
select ARCH_HAS_DMA_MARK_CLEAN
select ARCH_HAS_STRNCPY_FROM_USER
select ARCH_HAS_STRNLEN_USER
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
select ACPI

2
arch/m68k/Kconfig
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@ -16,8 +16,6 @@ config M68K
select GENERIC_CPU_DEVICES
select GENERIC_IOMAP
select GENERIC_IRQ_SHOW
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_AOUT if MMU
select HAVE_ASM_MODVERSIONS
select HAVE_DEBUG_BUGVERBOSE

2
arch/microblaze/Kconfig
View File

@ -21,8 +21,6 @@ config MICROBLAZE
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
select GENERIC_SCHED_CLOCK
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_ARCH_HASH
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP

2
arch/mips/Kconfig
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@ -9,6 +9,8 @@ config MIPS
select ARCH_HAS_KCOV
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE if !EVA
select ARCH_HAS_PTE_SPECIAL if !(32BIT && CPU_HAS_RIXI)
select ARCH_HAS_STRNCPY_FROM_USER
select ARCH_HAS_STRNLEN_USER
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_HAS_GCOV_PROFILE_ALL

2
arch/nds32/Kconfig
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@ -26,8 +26,6 @@ config NDS32
select GENERIC_LIB_LSHRDI3
select GENERIC_LIB_MULDI3
select GENERIC_LIB_UCMPDI2
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select HANDLE_DOMAIN_IRQ
select HAVE_ARCH_TRACEHOOK

2
arch/nios2/Kconfig
View File

@ -13,8 +13,6 @@ config NIOS2
select GENERIC_CPU_DEVICES
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_KGDB
select IRQ_DOMAIN

2
arch/openrisc/Kconfig
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@ -25,8 +25,6 @@ config OPENRISC
select HAVE_UID16
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS_BROADCAST
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_SMP_IDLE_THREAD
select MODULES_USE_ELF_RELA
select HAVE_DEBUG_STACKOVERFLOW

2
arch/parisc/Kconfig
View File

@ -11,6 +11,7 @@ config PARISC
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_HAS_STRNLEN_USER
select ARCH_NO_SG_CHAIN
select ARCH_SUPPORTS_HUGETLBFS if PA20
select ARCH_SUPPORTS_MEMORY_FAILURE
@ -34,7 +35,6 @@ config PARISC
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_SMP_IDLE_THREAD
select GENERIC_CPU_DEVICES
select GENERIC_STRNCPY_FROM_USER
select GENERIC_LIB_DEVMEM_IS_ALLOWED
select SYSCTL_ARCH_UNALIGN_ALLOW
select SYSCTL_EXCEPTION_TRACE

2
arch/powerpc/Kconfig
View File

@ -183,8 +183,6 @@ config PPC
select GENERIC_IRQ_SHOW_LEVEL
select GENERIC_PCI_IOMAP if PCI
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select GENERIC_VDSO_TIME_NS
select HAVE_ARCH_AUDITSYSCALL

2
arch/riscv/Kconfig
View File

@ -56,8 +56,6 @@ config RISCV
select GENERIC_PTDUMP if MMU
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL if MMU && 64BIT
select HANDLE_DOMAIN_IRQ
select HAVE_ARCH_AUDITSYSCALL

2
arch/s390/Kconfig
View File

@ -130,8 +130,6 @@ config S390
select GENERIC_GETTIMEOFDAY
select GENERIC_PTDUMP
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select GENERIC_VDSO_TIME_NS
select HAVE_ALIGNED_STRUCT_PAGE if SLUB

2
arch/sh/Kconfig
View File

@ -22,8 +22,6 @@ config SUPERH
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP if PCI
select GENERIC_SCHED_CLOCK
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_SMP_IDLE_THREAD
select GUP_GET_PTE_LOW_HIGH if X2TLB
select HAVE_ARCH_AUDITSYSCALL

2
arch/sparc/Kconfig
View File

@ -38,8 +38,6 @@ config SPARC
select HAVE_EBPF_JIT if SPARC64
select HAVE_DEBUG_BUGVERBOSE
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select MODULES_USE_ELF_RELA
select PCI_SYSCALL if PCI
select PCI_MSI_ARCH_FALLBACKS if PCI_MSI

2
arch/um/Kconfig
View File

@ -7,6 +7,8 @@ config UML
default y
select ARCH_EPHEMERAL_INODES
select ARCH_HAS_KCOV
select ARCH_HAS_STRNCPY_FROM_USER
select ARCH_HAS_STRNLEN_USER
select ARCH_NO_PREEMPT
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_SECCOMP_FILTER

2
arch/x86/Kconfig
View File

@ -144,8 +144,6 @@ config X86
select GENERIC_PENDING_IRQ if SMP
select GENERIC_PTDUMP
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select GENERIC_GETTIMEOFDAY
select GENERIC_VDSO_TIME_NS

3
arch/xtensa/Kconfig
View File

@ -7,6 +7,8 @@ config XTENSA
select ARCH_HAS_SYNC_DMA_FOR_CPU if MMU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE if MMU
select ARCH_HAS_DMA_SET_UNCACHED if MMU
select ARCH_HAS_STRNCPY_FROM_USER if !KASAN
select ARCH_HAS_STRNLEN_USER
select ARCH_USE_MEMTEST
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_USE_QUEUED_SPINLOCKS
@ -20,7 +22,6 @@ config XTENSA
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
select GENERIC_SCHED_CLOCK
select GENERIC_STRNCPY_FROM_USER if KASAN
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL

3
arch/xtensa/include/asm/uaccess.h
View File

@ -290,8 +290,7 @@ clear_user(void __user *addr, unsigned long size)
#define __clear_user __xtensa_clear_user
#ifndef CONFIG_GENERIC_STRNCPY_FROM_USER
#ifdef CONFIG_ARCH_HAS_STRNCPY_FROM_USER
extern long __strncpy_user(char *dst, const char __user *src, long count);
static inline long

2
arch/xtensa/kernel/xtensa_ksyms.c
View File

@ -43,7 +43,7 @@ EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(__memset);
EXPORT_SYMBOL(__memcpy);
EXPORT_SYMBOL(__memmove);
#ifndef CONFIG_GENERIC_STRNCPY_FROM_USER
#ifdef CONFIG_ARCH_HAS_STRNCPY_FROM_USER
EXPORT_SYMBOL(__strncpy_user);
#endif
EXPORT_SYMBOL(clear_page);

10
lib/Kconfig
View File

@ -50,12 +50,18 @@ config HAVE_ARCH_BITREVERSE
This option enables the use of hardware bit-reversal instructions on
architectures which support such operations.
config GENERIC_STRNCPY_FROM_USER
config ARCH_HAS_STRNCPY_FROM_USER
bool
config GENERIC_STRNLEN_USER
config ARCH_HAS_STRNLEN_USER
bool
config GENERIC_STRNCPY_FROM_USER
def_bool !ARCH_HAS_STRNCPY_FROM_USER
config GENERIC_STRNLEN_USER
def_bool !ARCH_HAS_STRNLEN_USER
config GENERIC_NET_UTILS
bool