arch/x86/Kconfig.debug

1 # SPDX-License-Identifier: GPL-2.0
29 	depends on EARLY_PRINTK && PCI
42 	depends on EARLY_PRINTK && PCI
50 	  a full-blown printk console driver + klogd.
54 	  print anything on the screen.
61 	depends on EFI
70 	bool "Set upper limit of TLB entries to flush one-by-one"
71 	depends on DEBUG_KERNEL
73 	  X86-only for now.
76 	  kernel flushes one-by-one instead of doing a full TLB flush. In
79 	  to -1, the code flushes the whole TLB unconditionally. Otherwise,
89 	depends on GART_IOMMU && DEBUG_KERNEL
90 	depends on X86_64
92 	  Force the IOMMU to on even when you have less than 4GB of
93 	  memory and add debugging code. On overflow always panic. And
100 	  options. See Documentation/arch/x86/x86_64/boot-options.rst for more
105 	depends on IOMMU_DEBUG && DMA_API_DEBUG
115 	depends on DEBUG_KERNEL && INSTRUCTION_DECODER
116 	depends on !COMPILE_TEST
124 	prompt "IO delay type"
128 	bool "port 0x80 based port-IO delay [recommended]"
130 	  This is the traditional Linux IO delay used for in/out_p.
134 	bool "port 0xed based port-IO delay"
136 	  Use port 0xed as the IO delay. This frees up port 0x80 which is
137 	  often used as a hardware-debug port.
140 	bool "udelay based port-IO delay"
142 	  Use udelay(2) as the IO delay method. This provides the delay
143 	  while not having any side-effect on the IO port space.
146 	bool "no port-IO delay"
148 	  No port-IO delay. Will break on old boxes that require port-IO
149 	  delay for certain operations. Should work on most new machines.
155 	depends on DEBUG_KERNEL
156 	depends on DEBUG_FS
161 	bool "CPA self-test code"
162 	depends on DEBUG_KERNEL
164 	  Do change_page_attr() self-tests every 30 seconds.
167 	bool "Debug low-level entry code"
168 	depends on DEBUG_KERNEL
170 	  This option enables sanity checks in x86's low-level entry code.
178 	depends on DEBUG_KERNEL && X86_LOCAL_APIC
180 	  Enabling this option turns on a quick NMI selftest to verify
183 	  This might help diagnose strange hangs that rely on NMI to
190 	depends on INTEL_IMR
202 	depends on DEBUG_KERNEL
214 	depends on PCI
218 	  This is a debug driver, which gets the power states
219 	  of all Punit North Complex devices. The power states of
221 	  The current power state can be read from
235 	depends on X86_64
243 	  frame pointer unwinder.  It also enables a 5-10% performance
247 	  by roughly 2-4MB, depending on your kernel config.
259 	  overall performance will degrade by roughly 5-10%.
263 	depends on EXPERT
264 	depends on !STACKDEPOT