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
agp.h	char/agp: introduce asm-generic/agp.h	2023-02-13 22:13:29 +01:00
archrandom.h
asm-offsets.h
asm-prototypes.h
atomic.h	locking/atomic: make atomic*_{cmp,}xchg optional	2023-06-05 09:57:14 +02:00
atomic64.h
audit_change_attr.h
audit_dir_write.h
audit_read.h
audit_signal.h
audit_write.h
barrier.h
bitops.h
bitsperlong.h
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
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
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
getorder.h
hardirq.h
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.h
irq_regs.h
irq_work.h
irqflags.h
Kbuild	asm-generic: Fix spelling of architecture	2023-10-06 22:30:22 +02:00
kdebug.h
kmap_size.h
kprobes.h
kvm_para.h
kvm_types.h
linkage.h
local.h	locking/generic: Wire up local{,64}_try_cmpxchg()	2023-04-29 09:09:09 +02:00
local64.h	locking/generic: Wire up local{,64}_try_cmpxchg()	2023-04-29 09:09:09 +02:00
logic_io.h
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.h
mmiowb_types.h
mmu.h
mmu_context.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
page.h	asm-generic/page.h: Make pfn accessors static inlines	2023-05-29 11:27:08 +02:00
param.h
parport.h
pci.h
pci_iomap.h
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-nop4d.h
pgtable-nopmd.h
pgtable-nopud.h
pgtable_uffd.h
preempt.h	riscv: support PREEMPT_DYNAMIC with static keys	2023-08-31 00:18:34 -07:00
qrwlock.h
qrwlock_types.h
qspinlock.h	asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation	2023-11-22 09:32:49 -08:00
qspinlock_types.h
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.h	asm-generic: ticket-lock: Optimize arch_spin_value_unlocked()	2023-09-21 10:17:00 +02:00
spinlock_types.h
statfs.h
string.h
switch_to.h
syscall.h
syscalls.h
timex.h
tlb.h	mm: add utility functions for ptdesc	2023-08-21 13:37:52 -07:00
tlbflush.h
topology.h
trace_clock.h
uaccess.h
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