mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 13:46:47 +07:00
df013ffb81
cmpxchg() is widely used by lockless code, including NMI-safe lockless code. But on some architectures, the cmpxchg() implementation is not NMI-safe, on these architectures the lockless code may need a spin_trylock_irqsave() based implementation. This patch adds a Kconfig option: ARCH_HAVE_NMI_SAFE_CMPXCHG, so that NMI-safe lockless code can depend on it or provide different implementation according to it. On many architectures, cmpxchg is only NMI-safe for several specific operand sizes. So, ARCH_HAVE_NMI_SAFE_CMPXCHG define in this patch only guarantees cmpxchg is NMI-safe for sizeof(unsigned long). Signed-off-by: Huang Ying <ying.huang@intel.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Acked-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Richard Henderson <rth@twiddle.net> CC: Mikael Starvik <starvik@axis.com> Acked-by: David Howells <dhowells@redhat.com> CC: Yoshinori Sato <ysato@users.sourceforge.jp> CC: Tony Luck <tony.luck@intel.com> CC: Hirokazu Takata <takata@linux-m32r.org> CC: Geert Uytterhoeven <geert@linux-m68k.org> CC: Michal Simek <monstr@monstr.eu> Acked-by: Ralf Baechle <ralf@linux-mips.org> CC: Kyle McMartin <kyle@mcmartin.ca> CC: Martin Schwidefsky <schwidefsky@de.ibm.com> CC: Chen Liqin <liqin.chen@sunplusct.com> CC: "David S. Miller" <davem@davemloft.net> CC: Ingo Molnar <mingo@redhat.com> CC: Chris Zankel <chris@zankel.net> Signed-off-by: Len Brown <len.brown@intel.com>
185 lines
4.9 KiB
Plaintext
185 lines
4.9 KiB
Plaintext
#
|
|
# General architecture dependent options
|
|
#
|
|
|
|
config OPROFILE
|
|
tristate "OProfile system profiling"
|
|
depends on PROFILING
|
|
depends on HAVE_OPROFILE
|
|
select RING_BUFFER
|
|
select RING_BUFFER_ALLOW_SWAP
|
|
help
|
|
OProfile is a profiling system capable of profiling the
|
|
whole system, include the kernel, kernel modules, libraries,
|
|
and applications.
|
|
|
|
If unsure, say N.
|
|
|
|
config OPROFILE_EVENT_MULTIPLEX
|
|
bool "OProfile multiplexing support (EXPERIMENTAL)"
|
|
default n
|
|
depends on OPROFILE && X86
|
|
help
|
|
The number of hardware counters is limited. The multiplexing
|
|
feature enables OProfile to gather more events than counters
|
|
are provided by the hardware. This is realized by switching
|
|
between events at an user specified time interval.
|
|
|
|
If unsure, say N.
|
|
|
|
config HAVE_OPROFILE
|
|
bool
|
|
|
|
config KPROBES
|
|
bool "Kprobes"
|
|
depends on MODULES
|
|
depends on HAVE_KPROBES
|
|
select KALLSYMS
|
|
help
|
|
Kprobes allows you to trap at almost any kernel address and
|
|
execute a callback function. register_kprobe() establishes
|
|
a probepoint and specifies the callback. Kprobes is useful
|
|
for kernel debugging, non-intrusive instrumentation and testing.
|
|
If in doubt, say "N".
|
|
|
|
config JUMP_LABEL
|
|
bool "Optimize trace point call sites"
|
|
depends on HAVE_ARCH_JUMP_LABEL
|
|
help
|
|
If it is detected that the compiler has support for "asm goto",
|
|
the kernel will compile trace point locations with just a
|
|
nop instruction. When trace points are enabled, the nop will
|
|
be converted to a jump to the trace function. This technique
|
|
lowers overhead and stress on the branch prediction of the
|
|
processor.
|
|
|
|
On i386, options added to the compiler flags may increase
|
|
the size of the kernel slightly.
|
|
|
|
config OPTPROBES
|
|
def_bool y
|
|
depends on KPROBES && HAVE_OPTPROBES
|
|
depends on !PREEMPT
|
|
|
|
config HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
bool
|
|
help
|
|
Some architectures are unable to perform unaligned accesses
|
|
without the use of get_unaligned/put_unaligned. Others are
|
|
unable to perform such accesses efficiently (e.g. trap on
|
|
unaligned access and require fixing it up in the exception
|
|
handler.)
|
|
|
|
This symbol should be selected by an architecture if it can
|
|
perform unaligned accesses efficiently to allow different
|
|
code paths to be selected for these cases. Some network
|
|
drivers, for example, could opt to not fix up alignment
|
|
problems with received packets if doing so would not help
|
|
much.
|
|
|
|
See Documentation/unaligned-memory-access.txt for more
|
|
information on the topic of unaligned memory accesses.
|
|
|
|
config HAVE_SYSCALL_WRAPPERS
|
|
bool
|
|
|
|
config KRETPROBES
|
|
def_bool y
|
|
depends on KPROBES && HAVE_KRETPROBES
|
|
|
|
config USER_RETURN_NOTIFIER
|
|
bool
|
|
depends on HAVE_USER_RETURN_NOTIFIER
|
|
help
|
|
Provide a kernel-internal notification when a cpu is about to
|
|
switch to user mode.
|
|
|
|
config HAVE_IOREMAP_PROT
|
|
bool
|
|
|
|
config HAVE_KPROBES
|
|
bool
|
|
|
|
config HAVE_KRETPROBES
|
|
bool
|
|
|
|
config HAVE_OPTPROBES
|
|
bool
|
|
#
|
|
# An arch should select this if it provides all these things:
|
|
#
|
|
# task_pt_regs() in asm/processor.h or asm/ptrace.h
|
|
# arch_has_single_step() if there is hardware single-step support
|
|
# arch_has_block_step() if there is hardware block-step support
|
|
# asm/syscall.h supplying asm-generic/syscall.h interface
|
|
# linux/regset.h user_regset interfaces
|
|
# CORE_DUMP_USE_REGSET #define'd in linux/elf.h
|
|
# TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit}
|
|
# TIF_NOTIFY_RESUME calls tracehook_notify_resume()
|
|
# signal delivery calls tracehook_signal_handler()
|
|
#
|
|
config HAVE_ARCH_TRACEHOOK
|
|
bool
|
|
|
|
config HAVE_DMA_ATTRS
|
|
bool
|
|
|
|
config USE_GENERIC_SMP_HELPERS
|
|
bool
|
|
|
|
config HAVE_REGS_AND_STACK_ACCESS_API
|
|
bool
|
|
help
|
|
This symbol should be selected by an architecure if it supports
|
|
the API needed to access registers and stack entries from pt_regs,
|
|
declared in asm/ptrace.h
|
|
For example the kprobes-based event tracer needs this API.
|
|
|
|
config HAVE_CLK
|
|
bool
|
|
help
|
|
The <linux/clk.h> calls support software clock gating and
|
|
thus are a key power management tool on many systems.
|
|
|
|
config HAVE_DMA_API_DEBUG
|
|
bool
|
|
|
|
config HAVE_HW_BREAKPOINT
|
|
bool
|
|
depends on PERF_EVENTS
|
|
|
|
config HAVE_MIXED_BREAKPOINTS_REGS
|
|
bool
|
|
depends on HAVE_HW_BREAKPOINT
|
|
help
|
|
Depending on the arch implementation of hardware breakpoints,
|
|
some of them have separate registers for data and instruction
|
|
breakpoints addresses, others have mixed registers to store
|
|
them but define the access type in a control register.
|
|
Select this option if your arch implements breakpoints under the
|
|
latter fashion.
|
|
|
|
config HAVE_USER_RETURN_NOTIFIER
|
|
bool
|
|
|
|
config HAVE_PERF_EVENTS_NMI
|
|
bool
|
|
help
|
|
System hardware can generate an NMI using the perf event
|
|
subsystem. Also has support for calculating CPU cycle events
|
|
to determine how many clock cycles in a given period.
|
|
|
|
config HAVE_ARCH_JUMP_LABEL
|
|
bool
|
|
|
|
config HAVE_ARCH_MUTEX_CPU_RELAX
|
|
bool
|
|
|
|
config HAVE_RCU_TABLE_FREE
|
|
bool
|
|
|
|
config ARCH_HAVE_NMI_SAFE_CMPXCHG
|
|
bool
|
|
|
|
source "kernel/gcov/Kconfig"
|