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/linux/arch/x86/kernel/
H A Dsmp.c1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * (c) 1998-99, 2000, 2009 Ingo Molnar <mingo@redhat.com>
46 * None of the E1AP-E3AP errata are visible to the user.
53 * None of the A1AP-A3AP errata are visible to the user.
60 * None of 1AP-9AP errata are visible to the normal user,
62 * This is very rare and a non-problem.
64 * 1AP. Linux maps APIC as non-cacheable
65 * 2AP. worked around in hardware
68 * 4AP. worked around in hardware
71 * 6AP. 'noapic' mode might be affected - fixed in later steppings
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/linux/Documentation/process/
H A D6.Followthrough.rst9 developers can make is to conclude that their work is now done. In truth,
11 with, possibly, quite a bit of work yet to be done.
16 code. You, as the author of that code, will be expected to work with the
23 ----------------------
31 - If you have explained your patch well, reviewers will understand its
35 Many of the changes you may be asked to make - from coding style tweaks
36 to substantial rewrites - come from the understanding that Linux will
37 still be around and under development a decade from now.
39 - Code review is hard work, and it is a relatively thankless occupation;
47 - Similarly, code reviewers are not trying to promote their employers'
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/linux/arch/powerpc/platforms/44x/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
304 bool "Enable linker work around for PPC476FPE errata #46"
306 This option enables a work around for an icache bug on 476
309 of binutils which supports the --ppc476-workaround option.
311 The work around enables the appropriate linker options and
313 page boundaries. The work around is only required when
/linux/Documentation/driver-api/driver-model/
H A Ddesign-patterns.rst35 return -ENOMEM;
36 spin_lock_init(&foo->lock);
43 state around to all functions that need access to the state and its members.
46 pass around a pointer to struct foo like this::
69 Continuing on the above example we add an offloaded work::
78 static void foo_work(struct work_struct *work)
80 struct foo *foo = container_of(work, struct foo, offload);
89 queue_work(foo->wq, &foo->offload);
97 foo->wq = create_singlethread_workqueue("foo-wq");
98 INIT_WORK(&foo->offload, foo_work);
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/linux/Documentation/scsi/
H A Dscsi-changer.rst1 .. SPDX-License-Identifier: GPL-2.0
10 This is for *real* Jukeboxes. It is *not* supported to work with
11 common small CD-ROM changers, neither one-lun-per-slot SCSI changers
19 -------------------
21 First some words about how changers work: A changer has 2 (possibly
24 later may be anything, a MOD, a CD-ROM, a tape or whatever. For the
25 changer device this is a "don't care", he *only* shuffles around the
29 The SCSI changer model is complex, compared to - for example - IDE-CD
34 media transport this one shuffles around the media, i.e. the
42 CD-ROM / Tape / whatever drive.
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H A DChangeLog.sym53c8xx1 Sat May 12 12:00 2001 Gerard Roudier (groudier@club-internet.fr)
2 * version sym53c8xx-1.7.3c
3 - Ensure LEDC bit in GPCNTL is cleared when reading the NVRAM.
4 Fix sent by Stig Telfer <stig@api-networks.com>.
5 - Backport from SYM-2 the work-around that allows to support
7 - Check that we received at least 8 bytes of INQUIRY response
9 - Define scsi_set_pci_device() as nil for kernel < 2.4.4.
10 - + A couple of minor changes.
12 Sat Apr 7 19:30 2001 Gerard Roudier (groudier@club-internet.fr)
13 * version sym53c8xx-1.7.3b
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/linux/tools/testing/selftests/rseq/
H A Dcompiler.h1 /* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
5 * Work-around asm goto compiler bugs.
7 * (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
21 * https://github.com/llvm/llvm-project/issues/52735
23 * Work around these issues by adding a volatile inline asm with
/linux/arch/powerpc/platforms/8xx/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
20 development around the MPC86X processor families.
30 development around the MPC885 processor family.
33 bool "Embedded Planet EP88xC (a.k.a. CWH-PPC-885XN-VE)"
39 MPC885 Evaluation System and/or the CWH-PPC-885XN-VE.
56 menu "Freescale Ethernet driver platform-specific options"
76 Enable FEC2 to serve as 2-nd Ethernet channel. Note that SMC2
77 (often 2-nd UART) will not work if this is enabled.
83 Enable SCC3 to serve as 2-nd Ethernet channel. Note that SMC1
84 (often 1-nd UART) will not work if this is enabled.
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/linux/include/linux/
H A Dcompiler-gcc.h1 /* SPDX-License-Identifier: GPL-2.0 */
3 #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
23 * To work around it we hide the relationship of the pointer and the object
27 * RELOC_HIDE could trash r30. The bug can be worked around by changing
51 * Adding an empty inline assembly before it works around the problem
80 #define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
146 * Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size"
147 * attribute) do not work, and must be disabled.
H A Dposix-timers_types.h1 /* SPDX-License-Identifier: GPL-2.0 */
37 * posix_cputimer_base - Container per posix CPU clock
38 * @nextevt: Earliest-expiration cache
47 * posix_cputimers - Container for posix CPU timer related data
63 * posix_cputimers_work - Container for task work based posix CPU timer expiry
64 * @work: The task work to be scheduled
65 * @mutex: Mutex held around expiry in context of this task work
66 * @scheduled: @work has been scheduled already, no further processing
69 struct callback_head work; member
/linux/Documentation/devicetree/bindings/phy/
H A Dmediatek,mt7988-xfi-tphy.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/phy/mediatek,mt7988-xfi-tphy.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: MediaTek MT7988 XFI T-PHY
10 - Daniel Golle <daniel@makrotopia.org>
13 The MediaTek XFI SerDes T-PHY provides the physical SerDes lanes
15 MediaTek's 10G-capabale MT7988 SoC.
20 const: mediatek,mt7988-xfi-tphy
27 - description: XFI PHY clock
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/linux/drivers/gpu/drm/xe/
H A Dxe_vm_doc.h1 /* SPDX-License-Identifier: MIT */
19 * ------------
33 * ----------
35 * DRM_XE_VM_BIND_OP_MAP - Create mapping for a BO
36 * DRM_XE_VM_BIND_OP_UNMAP - Destroy mapping for a BO / userptr
37 * DRM_XE_VM_BIND_OP_MAP_USERPTR - Create mapping for userptr
54 * .. code-block::
56 * bind BO0 0x0-0x1000
62 * bind BO1 0x201000-0x202000
66 * bind BO2 0x1ff000-0x201000
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/linux/arch/arm/mach-lpc32xx/
H A Dserial.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * arch/arm/mach-lpc32xx/serial.c
18 #include <linux/soc/nxp/lpc32xx-misc.h>
109 /* pre-UART clock divider set to 1 */ in lpc32xx_serial_init()
113 * Force a flush of the RX FIFOs to work around a in lpc32xx_serial_init()
120 while (j--) in lpc32xx_serial_init()
129 /* Force a flush of the RX FIFOs to work around a HW bug */ in lpc32xx_serial_init()
134 while (j--) in lpc32xx_serial_init()
144 /* Disable UART5->USB transparent mode or USB won't work */ in lpc32xx_serial_init()
/linux/Documentation/fb/
H A Dvesafb.rst13 impossible; BIOS calls work in real mode only. VESA BIOS Extensions
20 * You can run XF68_FBDev on top of /dev/fb0 (=> non-accelerated X11
22 * Most important: boot logo :-)
33 Documentation/admin-guide/svga.rst for details.
74 If this does not work, this might be because your BIOS does not support
81 "vga=mode-number" you have to transform the numbers to decimal.
82 2. Note: Some newer versions of LILO appear to work with those hex values,
88 XF68_FBDev should work just fine, but it is non-accelerated. Running
89 another (accelerated) X-Server like XF86_SVGA might or might not work.
90 It depends on X-Server and graphics board.
[all …]
/linux/Documentation/core-api/
H A Dworkqueue.rst17 When such an asynchronous execution context is needed, a work item
22 While there are work items on the workqueue the worker executes the
23 functions associated with the work items one after the other. When
24 there is no work item left on the workqueue the worker becomes idle.
25 When a new work item gets queued, the worker begins executing again.
33 thread system-wide. A single MT wq needed to keep around the same
43 while an ST wq one for the whole system. Work items had to compete for
45 including proneness to deadlocks around the single execution context.
60 * Use per-CPU unified worker pools shared by all wq to provide
72 abstraction, the work item, is introduced.
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/linux/arch/mips/include/asm/mach-cavium-octeon/
H A Dkernel-entry-init.h6 * Copyright (C) 2005-2008 Cavium Networks, Inc
48 xor t1, t1, 0x9000 # 63-P1
51 xor t1, t1, 0x9008 # 63-P2
54 xor t1, t1, 0x9100 # 68-P1
57 xor t1, t1, 0x9200 # 66-PX
60 slti t1, t1, 2 # 66-P1.2 and later good.
63 4: # core-16057 work around
66 5: # No core-16057 work around
77 sd $0, -32768(v0)
/linux/Documentation/sphinx/
H A Dautomarkup.py1 # SPDX-License-Identifier: GPL-2.0
4 # Apply kernel-specific tweaks after the initial document processing
29 RE_function = re.compile(r'\b(([a-zA-Z_]\w+)\(\))', flags=ascii_p3)
34 RE_generic_type = re.compile(r'\b(struct|union|enum|typedef)\s+([a-zA-Z_]\w+)',
41 RE_struct = re.compile(r'\b(struct)\s+([a-zA-Z_]\w+)', flags=ascii_p3)
42 RE_union = re.compile(r'\b(union)\s+([a-zA-Z_]\w+)', flags=ascii_p3)
43 RE_enum = re.compile(r'\b(enum)\s+([a-zA-Z_]\w+)', flags=ascii_p3)
44 RE_typedef = re.compile(r'\b(typedef)\s+([a-zA-Z_]\w+)', flags=ascii_p3)
50 RE_doc = re.compile(r'(\bDocumentation/)?((\.\./)*[\w\-/]+)\.(rst|txt)')
55 # Reserved C words that we should skip when cross-referencing
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/linux/Documentation/admin-guide/media/
H A Dvivid.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Each input can be a webcam, TV capture device, S-Video capture device or an HDMI
14 capture device. Each output can be an S-Video output device or an HDMI output
23 - Support for read()/write(), MMAP, USERPTR and DMABUF streaming I/O.
24 - A large list of test patterns and variations thereof
25 - Working brightness, contrast, saturation and hue controls
26 - Support for the alpha color component
27 - Full colorspace support, including limited/full RGB range
28 - All possible control types are present
29 - Support for various pixel aspect ratios and video aspect ratios
[all …]
/linux/Documentation/doc-guide/
H A Dcontributing.rst1 .. SPDX-License-Identifier: GPL-2.0
6 Documentation is an important part of any software-development project.
8 developers work more effectively. Without top-quality documentation, a lot
9 of time is wasted in reverse-engineering the code and making avoidable
23 ---------------------------
35 people ignore them, and they will never notice when their work adds new
36 ones. For this reason, eliminating warnings is one of the highest-priority
59 - Resource-managed devfreq_register_notifier()
61 - Resource-managed devfreq_unregister_notifier()
70 - Resource-managed devfreq_register_notifier()
[all …]
/linux/Documentation/devicetree/bindings/spi/
H A Drenesas,sh-msiof.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/spi/renesas,sh-msiof.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Geert Uytterhoeven <geert+renesas@glider.be>
13 - $ref: spi-controller.yaml#
18 - items:
19 - const: renesas,msiof-sh73a0 # SH-Mobile AG5
20 - const: renesas,sh-mobile-msiof # generic SH-Mobile compatible
22 - items:
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/linux/arch/m68k/mm/
H A Dmemory.c1 // SPDX-License-Identifier: GPL-2.0
34 /* invalidate page in i-cache */
71 * 040: Hit every page containing an address in the range paddr..paddr+len-1.
106 * is not page-aligned. Page align the addresses to work in cache_clear()
107 * around bug I17 in the 68060. in cache_clear()
109 if ((tmp = -paddr & (PAGE_SIZE - 1))) { in cache_clear()
111 if ((len -= tmp) <= 0) in cache_clear()
117 while ((len -= tmp) >= 0) { in cache_clear()
158 len += paddr & (PAGE_SIZE - 1); in cache_push()
161 * Work around bug I17 in the 68060 affecting some instruction in cache_push()
[all …]
/linux/Documentation/devicetree/bindings/net/
H A Dmdio.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Andrew Lunn <andrew@lunn.ch>
11 - Florian Fainelli <f.fainelli@gmail.com>
12 - Heiner Kallweit <hkallweit1@gmail.com>
17 bus. These should follow the generic ethernet-phy.yaml document, or
22 pattern: '^mdio(-(bus|external))?(@.+|-([0-9]+))?$'
24 "#address-cells":
27 "#size-cells":
[all …]
/linux/scripts/
H A Dextract-ikconfig2 # ----------------------------------------------------------------------
3 # extract-ikconfig - Extract the .config file from a kernel image
5 # This will only work when the kernel was compiled with CONFIG_IKCONFIG.
7 # The obscure use of the "tr" filter is to work around older versions of
12 # ----------------------------------------------------------------------
19 if pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`
22 tail -c+$(($pos+8)) "$1" | zcat > $tmp1 2> /dev/null
33 for pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
36 tail -c+$pos "$img" | $3 > $tmp2 2> /dev/null
44 if [ $# -ne 1 -o ! -s "$img" ]
[all …]
/linux/tools/testing/selftests/kvm/x86_64/
H A Dvmx_nested_tsc_scaling_test.c1 // SPDX-License-Identifier: GPL-2.0-only
21 #define TSC_OFFSET_L2 ((uint64_t) -33125236320908)
42 thresh_low = expected - tolerance; in compare_tsc_freq()
69 tsc_freq = tsc_end - tsc_start; in check_tsc_freq()
140 * variable does not work. in main()
151 l0_tsc_freq = tsc_end - tsc_start; in main()
152 printf("real TSC frequency is around: %"PRIu64"\n", l0_tsc_freq); in main()
159 TEST_ASSERT(tsc_khz != -1, "vcpu ioctl KVM_GET_TSC_KHZ failed"); in main()
180 printf("L1's TSC frequency is around: %"PRIu64 in main()
188 printf("L2's TSC frequency is around: %"PRIu64 in main()
/linux/Documentation/driver-api/usb/
H A Dpersist.rst1 .. _usb-persist:
14 bus must continue to supply suspend current (around 1-5 mA). This
16 detect connect-change events (devices being plugged in or unplugged).
35 system woke up, who cares? It'll still work the same when you type on
38 Unfortunately problems _can_ arise, particularly with mass-storage
41 filesystem on the device, you're out of luck -- everything in that
57 suspend-to-RAM. On almost all systems, no suspend current is
58 available during hibernation (also known as swsusp or suspend-to-disk).
65 suspended -- but it will crash as soon as it wakes up, which isn't
72 The kernel includes a feature called USB-persist. It tries to work
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