Linus Torvalds 88ceaf8e2c asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation ... [ Upstream commit 125b0bb95d ] 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> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-12-20 15:41:22 +01:00
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bitops	locking/atomic: Make test_and_*_bit() ordered on failure	2022-08-25 11:18:31 +02:00
vdso	lib/vdso: Make __arch_update_vdso_data() logic understandable	2020-03-05 16:43:49 +01:00
4level-fixup.h	mm: make the __PAGETABLE_PxD_FOLDED defines non-empty	2018-11-02 08:31:52 +01:00
5level-fixup.h	include/asm-generic/5level-fixup.h: fix variable 'p4d' set but not used	2019-08-13 16:06:52 -07:00
Kbuild	asm-generic: make simd.h a mandatory include/asm header	2019-07-31 21:29:24 +10:00
asm-offsets.h	…
asm-prototypes.h	…
atomic-instrumented.h	locking/atomics: Check atomic headers with sha1sum	2019-02-13 08:07:31 +01:00
atomic-long.h	locking/atomics: Check atomic headers with sha1sum	2019-02-13 08:07:31 +01:00
atomic.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
atomic64.h	locking/atomic: Use s64 for atomic64	2019-06-03 12:32:56 +02:00
audit_change_attr.h	…
audit_dir_write.h	…
audit_read.h	…
audit_signal.h	…
audit_write.h	…
barrier.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
bitops-instrumented.h	asm-generic, x86: add bitops instrumentation for KASAN	2019-07-12 11:05:42 -07:00
bitops.h	…
bitsperlong.h	…
bug.h	bug: move WARN_ON() "cut here" into exception handler	2019-09-25 17:51:41 -07:00
cache.h	…
cacheflush.h	asm-generic/nds32: don't redefine cacheflush primitives	2020-01-17 19:48:43 +01:00
checksum.h	…
cmpxchg-local.h	…
cmpxchg.h	…
compat.h	asm-generic: Move common compat types to asm-generic/compat.h	2018-08-29 15:42:20 +02:00
current.h	…
delay.h	…
device.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
div64.h	asm-generic changes for v5.4	2019-09-17 14:30:30 -07:00
dma-contiguous.h	…
dma-mapping.h	dma-mapping: bypass indirect calls for dma-direct	2018-12-13 21:06:18 +01:00
dma.h	…
early_ioremap.h	…
emergency-restart.h	…
error-injection.h	error-injection: Consolidate override function definition	2019-08-07 13:52:43 +01:00
exec.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
export.h	module: Remove leftover '#undef' from export header	2019-09-12 15:29:46 +02:00
extable.h	…
fb.h	…
fixmap.h	mm: introduce common STRUCT_PAGE_MAX_SHIFT define	2018-12-14 15:05:45 -08:00
flat.h	binfmt_flat: remove the persistent argument from flat_get_addr_from_rp	2019-06-24 09:16:47 +10:00
ftrace.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
futex.h	futex: Cleanup generic SMP variant of arch_futex_atomic_op_inuser()	2019-07-22 11:20:10 +02:00
getorder.h	asm-generic: fix -Wtype-limits compiler warnings	2019-08-03 07:02:01 -07:00
gpio.h	…
hardirq.h	…
hugetlb.h	hugetlb: allow to free gigantic pages regardless of the configuration	2019-05-14 09:47:47 -07:00
hw_irq.h	…
ide_iops.h	…
int-ll64.h	int-ll64.h: define u{8,16,32,64} and s{8,16,32,64} based on uapi header	2018-06-07 17:34:38 -07:00
io.h	asm-generic/io.h: suppress endianness warnings for readq() and writeq()	2023-05-17 11:35:32 +02:00
ioctl.h	…
iomap.h	iomap: introduce io{read|write}64_{lo_hi|hi_lo}	2019-01-22 13:39:59 +01:00
irq.h	…
irq_regs.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
irq_work.h	…
irqflags.h	…
kdebug.h	…
kmap_types.h	…
kprobes.h	…
kvm_para.h	…
linkage.h	…
local.h	…
local64.h	…
mcs_spinlock.h	…
memory_model.h	…
mm-arch-hooks.h	…
mm_hooks.h	x86/mpx, mm/core: Fix recursive munmap() corruption	2019-05-09 10:37:17 +02:00
mmiowb.h	asm-generic/mmiowb: Allow mmiowb_set_pending() when preemptible()	2020-07-29 10:18:40 +02:00
mmiowb_types.h	asm-generic/mmiowb: Add generic implementation of mmiowb() tracking	2019-04-08 11:59:39 +01:00
mmu.h	…
mmu_context.h	…
module.h	…
mshyperv.h	x86/Hyper-V: Report crash data in die() when panic_on_oops is set	2020-04-23 10:36:24 +02:00
msi.h	…
page.h	asm-generic/page.h: fix typo in #error text requiring a real asm/page.h	2019-02-22 21:53:25 +01:00
param.h	…
parport.h	…
pci.h	…
pci_iomap.h	…
percpu.h	percpu: remove PER_CPU_DEF_ATTRIBUTES macro	2018-10-31 08:54:14 -07:00
pgalloc.h	mm: treewide: clarify pgtable_page_{ctor,dtor}() naming	2019-09-26 10:10:44 -07:00
pgtable-nop4d-hack.h	x86/mm: Validate kernel_physical_mapping_init() PTE population	2018-12-05 09:03:06 +01:00
pgtable-nop4d.h	x86/mm: Validate kernel_physical_mapping_init() PTE population	2018-12-05 09:03:06 +01:00
pgtable-nopmd.h	mm: make the __PAGETABLE_PxD_FOLDED defines non-empty	2018-11-02 08:31:52 +01:00
pgtable-nopud.h	x86/mm: Validate kernel_physical_mapping_init() PTE population	2018-12-05 09:03:06 +01:00
pgtable.h	arch: pgtable: define MAX_POSSIBLE_PHYSMEM_BITS where needed	2020-12-02 08:49:50 +01:00
preempt.h	sched/preempt: Use CONFIG_PREEMPTION where appropriate	2019-07-31 19:03:34 +02:00
qrwlock.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157	2019-05-30 11:26:37 -07:00
qrwlock_types.h	…
qspinlock.h	asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation	2023-12-20 15:41:22 +01:00
qspinlock_types.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157	2019-05-30 11:26:37 -07:00
resource.h	…
seccomp.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
sections.h	asm-generic: sections: refactor memory_intersects	2022-09-05 10:27:43 +02:00
serial.h	…
set_memory.h	…
shmparam.h	treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers	2019-05-14 19:52:48 -07:00
signal.h	…
simd.h	…
spinlock.h	…
statfs.h	…
string.h	…
switch_to.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
syscall.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 193	2019-05-30 11:29:21 -07:00
syscalls.h	…
termios-base.h	…
termios.h	…
timex.h	…
tlb.h	mm/khugepaged: fix GUP-fast interaction by sending IPI	2022-12-14 11:30:42 +01:00
tlbflush.h	…
topology.h	include/asm-generic/topology.h: guard cpumask_of_node() macro argument	2020-06-03 08:21:27 +02:00
trace_clock.h	…
uaccess.h	asm-generic: optimize generic uaccess for 8-byte loads and stores	2019-04-23 21:51:41 +02:00
unaligned.h	…
user.h	…
vga.h	…
vmlinux.lds.h	arch: fix broken BuildID for arm64 and riscv	2023-03-17 08:32:53 +01:00
vtime.h	…
word-at-a-time.h	word-at-a-time: use the same return type for has_zero regardless of endianness	2023-08-11 11:53:54 +02:00
xor.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 47	2019-05-24 17:27:13 +02:00