Mateusz Guzik c8afaa1b0f locking: remove spin_lock_prefetch ... The only remaining consumer is new_inode, where it showed up in 2001 as commit c37fa164f793 ("v2.4.9.9 -> v2.4.9.10") in a historical repo [1] with a changelog which does not mention it. Since then the line got only touched up to keep compiling. While it may have been of benefit back in the day, it is guaranteed to at best not get in the way in the multicore setting -- as the code performs *a lot* of work between the prefetch and actual lock acquire, any contention means the cacheline is already invalid by the time the routine calls spin_lock(). It adds spurious traffic, for short. On top of it prefetch is notoriously tricky to use for single-threaded purposes, making it questionable from the get go. As such, remove it. I admit upfront I did not see value in benchmarking this change, but I can do it if that is deemed appropriate. Removal from new_inode and of the entire thing are in the same patch as requested by Linus, so whatever weird looks can be directed at that guy. Link: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/fs/inode.c?id=c37fa164f793735b32aa3f53154ff1a7659e6442 [1] Signed-off-by: Mateusz Guzik <mjguzik@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2023-08-12 09:18:47 -07:00
..
native	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
sn	ia64: remove the SGI UV simulator support	2019-08-16 11:33:57 -07:00
uv	ia64: headers: drop duplicated words	2021-06-29 10:53:45 -07:00
acenv.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
acpi-ext.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
acpi.h	ACPI: processor: Use CPUIDLE_FLAG_TLB_FLUSHED	2020-09-16 19:36:25 +02:00
asm-offsets.h	kbuild: move asm-offsets.h to include/generated	2009-12-12 13:08:14 +01:00
asm-prototypes.h	asm-prototypes.h: use linux/uaccess.h, not asm/uaccess.h	2017-12-04 18:03:39 -05:00
asmmacro.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
atomic.h	locking/atomic: make atomic*_{cmp,}xchg optional	2023-06-05 09:57:14 +02:00
barrier.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
bitops.h	provide arch_test_bit_acquire for architectures that define test_bit	2022-08-27 09:49:54 -07:00
bug.h	bug.h: work around GCC PR82365 in BUG()	2018-02-21 15:35:43 -08:00
cache.h	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
cacheflush.h	mm: rename flush_icache_user_range to flush_icache_user_page	2020-06-08 11:05:58 -07:00
checksum.h	unify generic instances of csum_partial_copy_nocheck()	2020-08-20 15:45:14 -04:00
clocksource.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
cmpxchg.h	locking/arch: Rename all internal __xchg() names to __arch_xchg()	2023-04-29 09:08:44 +02:00
cpu.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
cputime.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
current.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
cyclone.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
delay.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
device.h	ia64: Remove dev->archdata.iommu pointer	2020-06-30 11:59:48 +02:00
div64.h	[IA64] Move include/asm-ia64 to arch/ia64/include/asm	2008-08-01 10:21:21 -07:00
dma-mapping.h	dma-mapping: no need to pass a bus_type into get_arch_dma_ops()	2023-02-15 12:35:20 +01:00
dma.h	PCI: Move isa_dma_bridge_buggy out of asm/dma.h	2022-07-22 17:24:47 -05:00
dmi.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
early_ioremap.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
efi.h	efi: ia64: move IA64-only declarations to new asm/efi.h header	2021-01-18 13:50:37 +01:00
elf.h	ia64: Rename 'ip' to 'addr' in 'struct fdesc'	2022-02-16 23:25:11 +11:00
emergency-restart.h	[IA64] Move include/asm-ia64 to arch/ia64/include/asm	2008-08-01 10:21:21 -07:00
esi.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
exception.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
extable.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fb.h	fbdev: Rename fb_mem*() helpers	2023-05-18 11:07:54 +02:00
fpswa.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ftrace.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
futex.h	futex: arch_futex_atomic_op_inuser() calling conventions change	2020-03-27 23:58:51 -04:00
gcc_intrin.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
hardirq.h	softirq/ia64: Switch to generic local_softirq_pending() implementation	2018-05-14 11:25:27 +02:00
hugetlb.h	mm: change huge_ptep_clear_flush() to return the original pte	2022-05-13 16:48:55 -07:00
hw_irq.h	arch: ia64: Remove rest of perfmon support	2021-01-22 12:12:20 +05:30
idle.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
intrinsics.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
io.h	ia64: remove unused __SLOW_DOWN_IO and SLOW_DOWN_IO definitions	2022-11-18 13:55:08 -08:00
iommu.h	iommu/vt-d: Check VT-d RMRR region in BIOS is reported as reserved	2019-11-11 16:06:07 +01:00
iosapic.h	ia64: remove the hpsim platform	2019-08-16 11:33:57 -07:00
irq_regs.h
irq_remapping.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
irq.h	ia64: remove generated/nr-irqs.h generation to fix build warning	2021-02-12 05:11:19 +09:00
irqflags.h	ia64: remove stale paravirt leftovers	2019-12-02 14:18:12 -08:00
Kbuild	kbuild: generate KSYMTAB entries by modpost	2023-06-22 21:17:10 +09:00
kdebug.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
kexec.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
kprobes.h	ia64/kprobes: remove orphan declarations from arch/ia64/include/asm/kprobes.h	2022-11-18 13:55:08 -08:00
kregs.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
libata-portmap.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
linkage.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
local.h	[IA64] Move include/asm-ia64 to arch/ia64/include/asm	2008-08-01 10:21:21 -07:00
mca_asm.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mca.h	ia64: remove unneeded header includes from <asm/mca.h>	2021-02-12 05:11:19 +09:00
meminit.h	ia64: make num_rsvd_regions static	2021-09-03 09:58:09 -07:00
mman.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mmiowb.h	ia64: remove now unused machvec indirections	2019-08-16 11:33:57 -07:00
mmu_context.h	ia64: old_rr4 added under CONFIG_HUGETLB_PAGE	2022-07-17 17:31:43 -07:00
mmu.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mmzone.h	ia64: remove support for machvecs	2019-08-16 14:32:26 -07:00
module.h	ia64: module: fix symbolizer crash on fdescr	2021-04-30 11:20:35 -07:00
module.lds.h	kbuild: preprocess module linker script	2020-09-25 00:36:41 +09:00
msidef.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
nodedata.h	[IA64] Move include/asm-ia64 to arch/ia64/include/asm	2008-08-01 10:21:21 -07:00
numa.h	ia64: export node_distance function	2018-11-26 18:30:40 -08:00
page.h	mm, arch: add generic implementation of pfn_valid() for FLATMEM	2023-02-09 16:51:41 -08:00
pal.h	kernel.h: split out panic and oops helpers	2021-07-01 11:06:04 -07:00
param.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
parport.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
patch.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pci.h	PCI: Remove pci_get_legacy_ide_irq() and asm-generic/pci.h	2022-07-22 17:23:45 -05:00
percpu.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pgalloc.h	mm/thp: define default pmd_pgtable()	2021-07-01 11:06:03 -07:00
pgtable.h	mm: remove __HAVE_ARCH_PTE_SWP_EXCLUSIVE	2023-02-02 22:33:11 -08:00
processor.h	locking: remove spin_lock_prefetch	2023-08-12 09:18:47 -07:00
ptrace.h	ptrace: Remove arch_ptrace_attach	2022-05-11 14:33:54 -05:00
sal.h	treewide: Replace zero-length arrays with flexible-array members	2022-02-17 07:00:39 -06:00
sections.h	asm-generic: Refactor dereference_[kernel]_function_descriptor()	2022-02-16 23:25:11 +11:00
serial.h	[IA64] Move include/asm-ia64 to arch/ia64/include/asm	2008-08-01 10:21:21 -07:00
shmparam.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
signal.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
smp.h	locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header	2020-08-06 16:13:13 +02:00
sparsemem.h	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
spinlock_types.h	locking: Allow to include asm/spinlock_types.h from linux/spinlock_types_raw.h	2021-12-07 15:14:12 +01:00
spinlock.h	locking: Remove spin_lock_flags() etc	2021-10-30 16:37:28 +02:00
string.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
switch_to.h	ia64: Remove perfmon	2020-09-11 09:34:32 -07:00
syscall.h	arch: remove unused function syscall_set_arguments()	2021-09-14 16:06:20 +02:00
thread_info.h	asm-generic updates for 5.18	2022-03-23 18:03:08 -07:00
timex.h	ia64: define get_cycles macro for arch-override	2022-05-13 23:59:22 +02:00
tlb.h	tlb: mmu_gather: Remove start/end arguments from tlb_gather_mmu()	2021-01-29 20:02:29 +01:00
tlbflush.h	ia64/tlb: Convert to generic mmu_gather	2019-04-03 10:32:49 +02:00
topology.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
types.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
uaccess.h	ia64: remove CONFIG_SET_FS support	2022-02-25 09:36:06 +01:00
uncached.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206	2019-05-30 11:29:53 -07:00
unistd.h	ia64: add __NR_umount2 definition	2019-01-25 17:22:20 +01:00
unwind.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
user.h	asm/user.h: killed unused macros	2022-01-30 21:17:00 -05:00
ustack.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
vermagic.h	arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h>	2020-04-23 10:50:26 +09:00
vga.h	remove ioremap_nocache and devm_ioremap_nocache	2020-01-06 09:45:59 +01:00
vmalloc.h	mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from <linux/vmalloc.h>	2019-12-10 10:12:55 +01:00
xor.h	lib/xor: make xor prototypes more friendly to compiler vectorization	2022-02-11 20:39:39 +11:00
xtp.h	locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header	2020-08-06 16:13:13 +02:00