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mirror_ubuntu-kernels/arch/alpha/include/asm
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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
..
agp_backend.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
asm-prototypes.h alpha: move __udiv_qrnnd library function to arch/alpha/lib/ 2021-09-18 14:45:48 -07:00
atomic.h locking/atomic: treewide: delete arch_atomic_*() kerneldoc 2023-06-05 09:57:24 +02:00
barrier.h alpha: Override READ_ONCE() with barriered implementation 2020-07-21 10:50:35 +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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cache.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cacheflush.h mm: rename flush_icache_user_range to flush_icache_user_page 2020-06-08 11:05:58 -07:00
checksum.h saner calling conventions for csum_and_copy_..._user() 2020-08-20 15:45:15 -04:00
cmpxchg.h locking/arch: Rename all internal __xchg() names to __arch_xchg() 2023-04-29 09:08:44 +02:00
compiler.h alpha: remove undef inline in compiler.h 2021-07-25 22:18:20 -07:00
console.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
core_apecs.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
core_cia.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
core_irongate.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
core_lca.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
core_marvel.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
core_mcpcia.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
core_polaris.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
core_t2.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
core_titan.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
core_tsunami.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
core_wildfire.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 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
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
elf.h [elf][non-regset] uninline elf_core_copy_task_fpregs() (and lose pt_regs argument) 2022-11-24 23:24:23 -05:00
emergency-restart.h
err_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
err_ev6.h
err_ev7.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
extable.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
floppy.h arch/*/: remove CONFIG_VIRT_TO_BUS 2022-06-28 13:20:21 +02:00
fpu.h alpha: lazy FPU switching 2023-02-24 23:14:22 -05:00
ftrace.h tracing: make CALLER_ADDRx overwriteable 2009-03-02 16:49:37 -05:00
futex.h futex: arch_futex_atomic_op_inuser() calling conventions change 2020-03-27 23:58:51 -04:00
gct.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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hw_irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hwrpb.h treewide: Replace zero-length arrays with flexible-array members 2022-02-17 07:00:39 -06:00
io_trivial.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
io.h alpha: remove unused __SLOW_DOWN_IO and SLOW_DOWN_IO definitions 2023-02-14 12:37:18 -05:00
irq.h alpha: Fix Eiger NR_IRQS to 128 2019-02-10 20:42:14 -08:00
irqflags.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
jensen.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
Kbuild Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha 2023-02-25 12:49:29 -08:00
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 locking/arch: Wire up local_try_cmpxchg() 2023-04-29 09:09:16 +02:00
machvec.h alpha: add full ioread64/iowrite64 implementation 2022-10-04 11:23:29 +02:00
mc146818rtc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mce.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mmu_context.h alpha: use asm-generic/mmu_context.h for no-op implementations 2020-10-26 16:45:05 +01:00
mmu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page.h mm, arch: add generic implementation of pfn_valid() for FLATMEM 2023-02-09 16:51:41 -08:00
pal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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
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
perf_event.h perf, arch: Cleanup perf-pmu init vs lockup-detector 2010-11-26 15:14:56 +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 kill signal_pt_regs() 2022-10-23 18:06:54 -04:00
rwonce.h alpha: Override READ_ONCE() with barriered implementation 2020-07-21 10:50:35 +01:00
serial.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
setup.h alpha: Use absolute_pointer to define COMMAND_LINE 2021-09-15 12:04:28 -07:00
sfp-machine.h
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
socket.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sparsemem.h alpha: switch from DISCONTIGMEM to SPARSEMEM 2020-12-15 12:13:42 -08:00
special_insns.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
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 Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscall.h alpha: Add syscall_get_return_value() 2021-07-25 22:33:03 -07:00
thread_info.h alpha: lazy FPU switching 2023-02-24 23:14:22 -05:00
timex.h alpha: define get_cycles macro for arch-override 2022-05-13 23:59:23 +02:00
tlb.h arch/tlb: Clean up simple architectures 2019-04-03 10:32:54 +02:00
tlbflush.h mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
topology.h alpha: remove DISCONTIGMEM and NUMA 2021-06-29 10:53:55 -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 uaccess: remove CONFIG_SET_FS 2022-02-25 09:36:06 +01:00
ucontext.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
unistd.h alpha: replace NR_SYSCALLS by NR_syscalls 2023-02-14 12:37:17 -05:00
user.h asm/user.h: killed unused macros 2022-01-30 21:17:00 -05:00
vga.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +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
word-at-a-time.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wrperfmon.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xchg.h locking/xchg/alpha: Remove superfluous memory barriers from the _local() variants 2018-03-12 10:59:03 +01:00
xor.h lib/xor: make xor prototypes more friendly to compiler vectorization 2022-02-11 20:39:39 +11:00