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
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Kbuild	char/agp: introduce asm-generic/agp.h	2023-02-13 22:13:29 +01:00
adi.h	…
adi_64.h	…
apb.h	…
asm-offsets.h	…
asm-prototypes.h	…
asm.h	…
asmmacro.h	…
atomic.h	…
atomic_32.h	locking/atomic: sparc: add preprocessor symbols	2023-06-05 09:57:17 +02:00
atomic_64.h	locking/atomic: sparc: add preprocessor symbols	2023-06-05 09:57:17 +02:00
auxio.h	…
auxio_32.h	…
auxio_64.h	…
backoff.h	SPARC: backoff.h: delete a duplicated word	2020-07-21 18:22:02 -07:00
barrier.h	…
barrier_32.h	…
barrier_64.h	…
bbc.h	…
bitext.h	…
bitops.h	…
bitops_32.h	bitops: wrap non-atomic bitops with a transparent macro	2022-06-30 19:52:41 -07:00
bitops_64.h	include: move find.h from asm_generic to linux	2022-01-15 08:47:31 -08:00
btext.h	…
bug.h	…
cache.h	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
cacheflush.h	…
cacheflush_32.h	sparc: cacheflush_32.h needs struct page	2022-04-23 09:27:17 -07:00
cacheflush_64.h	arm,sparc,unicore32: remove flush_icache_user_range	2020-06-08 11:05:57 -07:00
cachetlb_32.h	…
chafsr.h	…
checksum.h	sparc64: propagate the calling convention changes down to __csum_partial_copy_...()	2020-08-20 15:45:21 -04:00
checksum_32.h	sparc64: propagate the calling convention changes down to __csum_partial_copy_...()	2020-08-20 15:45:21 -04:00
checksum_64.h	sparc64: propagate the calling convention changes down to __csum_partial_copy_...()	2020-08-20 15:45:21 -04:00
chmctrl.h	…
clock.h	…
clocksource.h	…
cmpxchg.h	…
cmpxchg_32.h	sparc: mark __arch_xchg() as __always_inline	2023-07-13 09:54:32 -07:00
cmpxchg_64.h	sparc: mark __arch_xchg() as __always_inline	2023-07-13 09:54:32 -07:00
compat.h	asm-generic: compat: Cleanup duplicate definitions	2022-04-26 13:35:54 -07:00
compat_signal.h	…
contregs.h	…
cpu_type.h	…
cpudata.h	…
cpudata_32.h	…
cpudata_64.h	…
current.h	…
dcr.h	…
dcu.h	…
delay.h	…
delay_32.h	…
delay_64.h	…
device.h	…
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
ebus_dma.h	…
ecc.h	…
eeprom.h	…
elf.h	…
elf_32.h	…
elf_64.h	sparc32: switch to generic extables	2021-01-03 20:05:18 -05:00
estate.h	…
extable.h	sparc32: switch to generic extables	2021-01-03 20:05:18 -05:00
fb.h	fbdev: Rename fb_mem*() helpers	2023-05-18 11:07:54 +02:00
fbio.h	…
fhc.h	…
floppy.h	…
floppy_32.h	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
floppy_64.h	…
fpumacro.h	…
ftrace.h	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
futex.h	…
futex_32.h	…
futex_64.h	…
hardirq.h	…
hardirq_32.h	…
hardirq_64.h	…
head.h	…
head_32.h	…
head_64.h	…
hibernate.h	…
highmem.h	sparc/mm/highmem: flush cache and TLB	2021-01-24 10:34:52 -08:00
hugetlb.h	mm: change huge_ptep_clear_flush() to return the original pte	2022-05-13 16:48:55 -07:00
hvtramp.h	…
hw_irq.h	…
hypervisor.h	…
ide.h	mm: remove unneeded includes of <asm/pgalloc.h>	2020-08-07 11:33:26 -07:00
idprom.h	…
intr_queue.h	…
io-unit.h	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
io.h	sparc: Fix the generic IO helpers	2022-09-08 16:49:14 +02:00
io_32.h	sparc32: Move ioremap/iounmap declaration before asm-generic/io.h include	2020-10-05 09:44:41 +01:00
io_64.h	sparc: Fix the generic IO helpers	2022-09-08 16:49:14 +02:00
ioctls.h	…
iommu-common.h	…
iommu.h	…
iommu_32.h	…
iommu_64.h	…
irq.h	…
irq_32.h	init: consolidate prototypes in linux/init.h	2023-06-09 17:44:16 -07:00
irq_64.h	init: consolidate prototypes in linux/init.h	2023-06-09 17:44:16 -07:00
irqflags.h	…
irqflags_32.h	…
irqflags_64.h	…
jump_label.h	…
kdebug.h	…
kdebug_32.h	…
kdebug_64.h	…
kgdb.h	…
kprobes.h	kprobes: treewide: Make it harder to refer kretprobe_trampoline directly	2021-09-30 21:24:06 -04:00
ldc.h	…
leon.h	…
leon_amba.h	…
leon_pci.h	…
lsu.h	…
machines.h	…
mbus.h	…
mc146818rtc.h	…
mc146818rtc_32.h	…
mc146818rtc_64.h	…
mdesc.h	…
memctrl.h	…
mman.h	sparc/mm: enable ARCH_HAS_VM_GET_PAGE_PROT	2022-04-28 23:16:13 -07:00
mmu.h	…
mmu_32.h	…
mmu_64.h	…
mmu_context.h	…
mmu_context_32.h	sparc: use asm-generic/mmu_context.h for no-op implementations	2020-10-27 16:02:38 +01:00
mmu_context_64.h	mm: Expose untagging mask in /proc/$PID/status	2023-03-16 13:08:40 -07:00
mmzone.h	mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA	2021-06-29 10:53:55 -07:00
mxcc.h	…
nmi.h	watchdog/hardlockup: declare arch_touch_nmi_watchdog() only in linux/nmi.h	2023-06-19 16:25:29 -07:00
ns87303.h	…
obio.h	…
openprom.h	…
oplib.h	…
oplib_32.h	…
oplib_64.h	…
page.h	…
page_32.h	mm, arch: add generic implementation of pfn_valid() for FLATMEM	2023-02-09 16:51:41 -08:00
page_64.h	…
parport.h	…
pbm.h	…
pci.h	Merge branch 'pci/header-cleanup-immutable'	2022-08-04 11:46:53 -05:00
pcic.h	…
pcr.h	…
percpu.h	…
percpu_32.h	…
percpu_64.h	sparc64: Fix asm/percpu.h build error	2020-07-10 12:00:01 +02:00
perf_event.h	…
pgalloc.h	…
pgalloc_32.h	mm/thp: define default pmd_pgtable()	2021-07-01 11:06:03 -07:00
pgalloc_64.h	mm/thp: define default pmd_pgtable()	2021-07-01 11:06:03 -07:00
pgtable.h	…
pgtable_32.h	mm: remove __HAVE_ARCH_PTE_SWP_EXCLUSIVE	2023-02-02 22:33:11 -08:00
pgtable_64.h	sparc/mm: don't unconditionally set HW writable bit when setting PTE dirty on 64bit	2023-04-18 16:30:00 -07:00
pgtsrmmu.h	sparc/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on 32bit	2023-02-02 22:33:10 -08:00
pil.h	…
processor.h	…
processor_32.h	kernel: exit: cleanup release_thread()	2022-09-11 21:55:07 -07:00
processor_64.h	locking: remove spin_lock_prefetch	2023-08-12 09:18:47 -07:00
prom.h	of: Make devtree_lock declaration private	2023-04-10 18:32:31 -05:00
psr.h	…
ptrace.h	ptrace: Remove the unnecessary arguments from arch_ptrace_stop	2021-10-06 11:27:41 -05:00
qrwlock.h	…
qspinlock.h	…
ross.h	…
sbi.h	…
scratchpad.h	…
seccomp.h	…
sections.h	…
setup.h	…
sfafsr.h	…
sfp-machine.h	…
sfp-machine_32.h	…
sfp-machine_64.h	…
shmparam.h	…
shmparam_32.h	…
shmparam_64.h	…
sigcontext.h	…
signal.h	sparc: remove SA_STATIC_ALLOC macro definition	2020-09-14 17:04:49 -07:00
smp.h	…
smp_32.h	sparc: Unbreak the build	2022-09-29 19:21:10 -07:00
smp_64.h	sparc/cpu: Mark cpu_play_dead() __noreturn	2023-03-08 08:44:25 -08:00
sparsemem.h	sparc: drop unused MAX_PHYSADDR_BITS	2020-08-12 10:57:57 -07:00
spinlock.h	…
spinlock_32.h	…
spinlock_64.h	locking/arch: Move qrwlock.h include after qspinlock.h	2021-02-11 07:59:54 -05:00
spinlock_types.h	…
spitfire.h	…
stacktrace.h	…
starfire.h	…
string.h	…
string_32.h	…
string_64.h	…
sunbpp.h	…
swift.h	…
switch_to.h	…
switch_to_32.h	…
switch_to_64.h	sparc64: remove CONFIG_SET_FS support	2022-02-25 09:36:06 +01:00
syscall.h	arch: remove unused function syscall_set_arguments()	2021-09-14 16:06:20 +02:00
syscalls.h	sparc64: enable HAVE_COPY_THREAD_TLS	2020-06-23 10:49:54 +02:00
termbits.h	…
thread_info.h	…
thread_info_32.h	sparc: add support for TIF_NOTIFY_SIGNAL	2020-12-12 09:17:38 -07:00
thread_info_64.h	sparc64: remove CONFIG_SET_FS support	2022-02-25 09:36:06 +01:00
timer.h	…
timer_32.h	…
timer_64.h	init: consolidate prototypes in linux/init.h	2023-06-09 17:44:16 -07:00
timex.h	…
timex_32.h	sparc: use fallback for random_get_entropy() instead of zero	2022-05-13 23:59:23 +02:00
timex_64.h	…
tlb.h	…
tlb_32.h	…
tlb_64.h	mmu_gather: Remove per arch tlb_{start,end}_vma()	2022-07-21 10:50:13 -07:00
tlbflush.h	…
tlbflush_32.h	…
tlbflush_64.h	…
topology.h	…
topology_32.h	…
topology_64.h	…
trap_block.h	sparc64: Fix asm/percpu.h build error	2020-07-10 12:00:01 +02:00
traps.h	…
tsb.h	…
tsunami.h	…
ttable.h	…
turbosparc.h	…
uaccess.h	uaccess: generalize access_ok()	2022-02-25 09:36:05 +01:00
uaccess_32.h	uaccess: remove CONFIG_SET_FS	2022-02-25 09:36:06 +01:00
uaccess_64.h	mm: Introduce untagged_addr_remote()	2023-03-16 13:08:39 -07:00
unistd.h	fs: stat: compat: Add __ARCH_WANT_COMPAT_STAT	2022-04-26 13:35:45 -07:00
upa.h	…
uprobes.h	…
user.h	…
vaddrs.h	sparc/mm/highmem: Switch to generic kmap atomic	2020-11-06 23:14:57 +01:00
vdso.h	…
vga.h	…
viking.h	…
vio.h	vio: move to_vio_dev() to use container_of_const()	2023-01-27 13:45:41 +01:00
visasm.h	…
vmalloc.h	…
vvar.h	locking/seqlock, headers: Untangle the spaghetti monster	2020-08-06 16:13:13 +02:00
winmacro.h	…
xor.h	…
xor_32.h	lib/xor: make xor prototypes more friendly to compiler vectorization	2022-02-11 20:39:39 +11:00
xor_64.h	lib/xor: make xor prototypes more friendly to compiler vectorization	2022-02-11 20:39:39 +11:00