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a27bc11f4b
Switch to using the asm-generic/uaccess functions for non-MMU builds.
Remove all the m68knommu local specific uaccess defines and macros.
There is nothing so special about the m68knommu targets that they cannot
use all of the asm-generic uaccess support. Using the asm-generic
uaccess definitions also resolves some of the existing problems with
missing __user annotations in the m68knommu specific functions.
The elimination of all of the contents of uaccess_no.h means we can fold
the uaccess_mm.h back into uaccess.h - and just have the single file
now.
The resulting generated code ends up being slightly smaller (by a few
hundred bytes) due to the compilers ability to better optimize load
and stores without forcing its hand with asm statements.
Specifically trivial cases like this contrived example:
get_user(x, ptr);
x++;
put_user(x, ptr);
end up now being optimized to a single instruction on m68k. More
generally the compiler can avoid using a temporary register in many
cases as well.
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
145 lines
3.0 KiB
Plaintext
145 lines
3.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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config M68K
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bool
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default y
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select ARCH_32BIT_OFF_T
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select ARCH_HAS_BINFMT_FLAT
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select ARCH_HAS_DMA_PREP_COHERENT if HAS_DMA && MMU && !COLDFIRE
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select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA
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select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
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select ARCH_NO_PREEMPT if !COLDFIRE
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select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
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select DMA_DIRECT_REMAP if HAS_DMA && MMU && !COLDFIRE
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select HAVE_IDE
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select HAVE_AOUT if MMU
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select HAVE_ASM_MODVERSIONS
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select HAVE_DEBUG_BUGVERBOSE
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select GENERIC_IRQ_SHOW
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select GENERIC_ATOMIC64
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select NO_DMA if !MMU && !COLDFIRE
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select HAVE_UID16
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select VIRT_TO_BUS
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select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
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select GENERIC_CPU_DEVICES
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select GENERIC_IOMAP
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select GENERIC_STRNCPY_FROM_USER if MMU
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select GENERIC_STRNLEN_USER if MMU
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select UACCESS_MEMCPY if !MMU
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select ARCH_WANT_IPC_PARSE_VERSION
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select HAVE_FUTEX_CMPXCHG if MMU && FUTEX
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select HAVE_MOD_ARCH_SPECIFIC
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select MODULES_USE_ELF_REL
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select MODULES_USE_ELF_RELA
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select OLD_SIGSUSPEND3
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select OLD_SIGACTION
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select MMU_GATHER_NO_RANGE if MMU
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config CPU_BIG_ENDIAN
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def_bool y
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config ARCH_HAS_ILOG2_U32
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bool
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config ARCH_HAS_ILOG2_U64
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bool
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config GENERIC_HWEIGHT
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bool
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default y
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config GENERIC_CSUM
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bool
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config TIME_LOW_RES
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bool
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default y
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config NO_IOPORT_MAP
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def_bool y
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config ZONE_DMA
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bool
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default y
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config HZ
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int
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default 1000 if CLEOPATRA
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default 100
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config PGTABLE_LEVELS
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default 2 if SUN3 || COLDFIRE
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default 3
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config MMU
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bool "MMU-based Paged Memory Management Support"
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default y
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help
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Select if you want MMU-based virtualised addressing space
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support by paged memory management. If unsure, say 'Y'.
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config MMU_MOTOROLA
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bool
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config MMU_COLDFIRE
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bool
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config MMU_SUN3
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bool
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depends on MMU && !MMU_MOTOROLA && !MMU_COLDFIRE
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config KEXEC
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bool "kexec system call"
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depends on M68KCLASSIC
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select KEXEC_CORE
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help
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kexec is a system call that implements the ability to shutdown your
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current kernel, and to start another kernel. It is like a reboot
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but it is independent of the system firmware. And like a reboot
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you can start any kernel with it, not just Linux.
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The name comes from the similarity to the exec system call.
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It is an ongoing process to be certain the hardware in a machine
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is properly shutdown, so do not be surprised if this code does not
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initially work for you. As of this writing the exact hardware
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interface is strongly in flux, so no good recommendation can be
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made.
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config BOOTINFO_PROC
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bool "Export bootinfo in procfs"
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depends on KEXEC && M68KCLASSIC
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help
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Say Y to export the bootinfo used to boot the kernel in a
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"bootinfo" file in procfs. This is useful with kexec.
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menu "Platform setup"
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source "arch/m68k/Kconfig.cpu"
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source "arch/m68k/Kconfig.machine"
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source "arch/m68k/Kconfig.bus"
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endmenu
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menu "Kernel Features"
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endmenu
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if !MMU
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menu "Power management options"
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config PM
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bool "Power Management support"
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help
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Support processor power management modes
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endmenu
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endif
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source "arch/m68k/Kconfig.devices"
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