Linus Torvalds 125b0bb95d asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation ... We really don't want to do atomic_read() or anything like that, since we already have the value, not the lock. The whole point of this is that we've loaded the lock from memory, and we want to check whether the value we loaded was a locked one or not. The main use of this is the lockref code, which loads both the lock and the reference count in one atomic operation, and then works on that combined value. With the atomic_read(), the compiler would pointlessly spill the value to the stack, in order to then be able to read it back "atomically". This is the qspinlock version of commit c6f4a90022 ("asm-generic: ticket-lock: Optimize arch_spin_value_unlocked()") which fixed this same bug for ticket locks. Cc: Guo Ren <guoren@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Waiman Long <longman@redhat.com> Link: https://lore.kernel.org/all/CAHk-=whNRv0v6kQiV5QO6DJhjH4KEL36vWQ6Re8Csrnh4zbRkQ@mail.gmail.com/ Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2023-11-22 09:32:49 -08:00
..
bitops	mm: delete checks for xor_unlock_is_negative_byte()	2023-10-18 14:34:17 -07:00
vdso
access_ok.h	uaccess: remove CONFIG_SET_FS	2022-02-25 09:36:06 +01:00
agp.h	char/agp: introduce asm-generic/agp.h	2023-02-13 22:13:29 +01:00
archrandom.h	random: handle archrandom with multiple longs	2022-07-25 13:26:14 +02:00
asm-offsets.h
asm-prototypes.h
atomic64.h	locking/atomic: delete !ARCH_ATOMIC remnants	2021-05-26 13:20:52 +02:00
atomic.h	locking/atomic: make atomic*_{cmp,}xchg optional	2023-06-05 09:57:14 +02:00
audit_change_attr.h
audit_dir_write.h
audit_read.h
audit_signal.h
audit_write.h
barrier.h	asm-generic: Add memory barrier dma_mb()	2022-06-23 18:34:58 +01:00
bitops.h	include: move find.h from asm_generic to linux	2022-01-15 08:47:31 -08:00
bitsperlong.h	lib: extend the scope of small_const_nbits() macro	2021-05-06 19:24:11 -07:00
bug.h	panic: make function declarations visible	2023-06-09 17:44:15 -07:00
cache.h
cacheflush.h	mm: rationalise flush_icache_pages() and flush_icache_page()	2023-08-24 16:20:25 -07:00
checksum.h
cmpxchg-local.h	asm-generic: avoid __generic_cmpxchg_local warnings	2023-04-04 17:58:11 +02:00
cmpxchg.h	asm-generic: avoid __generic_cmpxchg_local warnings	2023-04-04 17:58:11 +02:00
compat.h	asm-generic: compat: fix compat_arg_u64() and compat_arg_u64_dual()	2022-11-01 10:20:11 +11:00
current.h	asm-generic: current: Don't include thread-info.h if building asm	2023-08-26 22:38:49 +02:00
delay.h
device.h
div64.h	ARM: 9117/1: asm-generic: div64: Remove always-true __div64_const32_is_OK()	2021-08-20 11:39:28 +01:00
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
early_ioremap.h	mm/early_ioremap.c: remove redundant early_ioremap_shutdown()	2021-09-08 11:50:24 -07:00
emergency-restart.h
error-injection.h	docs: fault-injection: add requirements of error injectable functions	2023-02-02 22:50:00 -08:00
exec.h
export.h	ia64,export.h: replace EXPORT_DATA_SYMBOL* with EXPORT_SYMBOL*	2023-06-22 21:21:06 +09:00
extable.h
fb.h	fbdev: Replace fb_pgprotect() with pgprot_framebuffer()	2023-10-12 09:20:46 +02:00
fixmap.h
flat.h
ftrace.h
futex.h	futex: Fix additional regressions	2021-12-11 23:31:51 +01:00
getorder.h	asm-generic: force inlining of get_order() to work around gcc10 poor decision	2020-12-15 22:46:15 -08:00
hardirq.h	irqstat: Move declaration into asm-generic/hardirq.h	2020-11-23 10:31:06 +01:00
hugetlb.h	mm: hugetlb: add huge page size param to set_huge_pte_at()	2023-09-29 17:20:47 -07:00
hw_irq.h
hyperv-tlfs.h	x86/hyperv: Add smp support for SEV-SNP guest	2023-08-22 00:38:20 +00:00
int-ll64.h
io.h	mm: ioremap: remove unneeded ioremap_allowed and iounmap_allowed	2023-08-18 10:12:36 -07:00
ioctl.h
iomap.h	asm-generic/iomap.h: remove ARCH_HAS_IOREMAP_xx macros	2023-08-18 10:12:32 -07:00
irq_regs.h
irq_work.h
irq.h
irqflags.h
Kbuild	asm-generic: Fix spelling of architecture	2023-10-06 22:30:22 +02:00
kdebug.h
kmap_size.h	mm/highmem: Provide and use CONFIG_DEBUG_KMAP_LOCAL	2020-11-24 14:42:08 +01:00
kprobes.h
kvm_para.h
kvm_types.h
linkage.h
local64.h	locking/generic: Wire up local{,64}_try_cmpxchg()	2023-04-29 09:09:09 +02:00
local.h	locking/generic: Wire up local{,64}_try_cmpxchg()	2023-04-29 09:09:09 +02:00
logic_io.h	logic_io instance of iounmap() needs volatile on argument	2021-12-21 21:31:08 +01:00
mcs_spinlock.h
memory_model.h	mm, arch: add generic implementation of pfn_valid() for FLATMEM	2023-02-09 16:51:41 -08:00
mm_hooks.h
mmiowb_types.h
mmiowb.h
mmu_context.h
mmu.h
module.h
module.lds.h
mshyperv.h	hyperv: reduce size of ms_hyperv_info	2023-09-22 20:28:16 +00:00
msi.h	genirq: Get rid of GENERIC_MSI_IRQ_DOMAIN	2022-11-17 15:15:20 +01:00
nommu_context.h
numa.h	numa: Move numa implementation to common code	2021-01-14 15:08:55 -08:00
page.h	asm-generic/page.h: Make pfn accessors static inlines	2023-05-29 11:27:08 +02:00
param.h
parport.h
pci_iomap.h	PCI: Stub __pci_ioport_map() for arches that don't support it at all	2022-07-29 12:01:00 -05:00
pci.h	asm-generic: Add new pci.h and use it	2022-07-22 17:34:57 -05:00
percpu.h	percpu: Fix self-assignment of __old in raw_cpu_generic_try_cmpxchg()	2023-06-08 10:28:39 +02:00
pgalloc.h	mm: add statistics for PUD level pagetable	2023-10-06 14:44:10 -07:00
pgtable_uffd.h
pgtable-nop4d.h	mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *	2021-07-08 11:48:22 -07:00
pgtable-nopmd.h	riscv/mm: fix two page table check related issues	2022-05-19 14:08:48 -07:00
pgtable-nopud.h	mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *	2021-07-08 11:48:22 -07:00
preempt.h	riscv: support PREEMPT_DYNAMIC with static keys	2023-08-31 00:18:34 -07:00
qrwlock_types.h	locking/qrwlock: Change "queue rwlock" to "queued rwlock"	2022-05-11 16:27:04 +02:00
qrwlock.h	asm-generic changes for 5.19	2022-05-26 10:50:30 -07:00
qspinlock_types.h
qspinlock.h	asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation	2023-11-22 09:32:49 -08:00
resource.h
rwonce.h
seccomp.h
sections.h	asm-generic: sections: refactor memory_intersects	2022-08-28 14:02:45 -07:00
serial.h
set_memory.h
shmparam.h
signal.h	asm-generic: Remove empty #ifdef SA_RESTORER	2022-09-10 09:56:53 +02:00
simd.h
softirq_stack.h	asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig.	2022-09-05 17:20:55 +02:00
spinlock_types.h	asm-generic: ticket-lock: New generic ticket-based spinlock	2022-05-11 11:49:38 -07:00
spinlock.h	asm-generic: ticket-lock: Optimize arch_spin_value_unlocked()	2023-09-21 10:17:00 +02:00
statfs.h
string.h
switch_to.h
syscall.h	ptrace: Create ptrace_report_syscall_{entry,exit} in ptrace.h	2022-03-10 13:35:08 -06:00
syscalls.h
timex.h
tlb.h	mm: add utility functions for ptdesc	2023-08-21 13:37:52 -07:00
tlbflush.h
topology.h	mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA	2021-06-29 10:53:55 -07:00
trace_clock.h
uaccess.h	uaccess: remove CONFIG_SET_FS	2022-02-25 09:36:06 +01:00
unaligned.h	asm-generic: make parameter types consistent in _unaligned_be48()	2022-09-11 21:55:12 -07:00
user.h
vermagic.h
vga.h
vmlinux.lds.h	linux/init: remove __memexit* annotations	2023-10-28 21:31:22 +09:00
vtime.h
word-at-a-time.h	word-at-a-time: use the same return type for has_zero regardless of endianness	2023-08-02 10:23:36 -07:00
xor.h	lib/xor: make xor prototypes more friendly to compiler vectorization	2022-02-11 20:39:39 +11:00