Kumar Kartikeya Dwivedi 82f3b142c9 rqspinlock: Fix TAS fallback lock entry creation ... The TAS fallback can be invoked directly when queued spin locks are disabled, and through the slow path when paravirt is enabled for queued spin locks. In the latter case, the res_spin_lock macro will attempt the fast path and already hold the entry when entering the slow path. This will lead to creation of extraneous entries that are not released, which may cause false positives for deadlock detection. Fix this by always preceding invocation of the TAS fallback in every case with the grabbing of the held lock entry, and add a comment to make note of this. Fixes: c9102a68c0 ("rqspinlock: Add a test-and-set fallback") Reported-by: Amery Hung <ameryhung@gmail.com> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Tested-by: Amery Hung <ameryhung@gmail.com> Link: https://lore.kernel.org/r/20260122115911.3668985-1-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2026-01-23 10:03:49 -08:00
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bitops	bitops: Add __attribute_const__ to generic ffs()-family implementations	2025-09-08 14:58:50 -07:00
vdso	vdso: Drop Kconfig GENERIC_VDSO_DATA_STORE	2025-09-04 11:23:50 +02:00
Kbuild	unwind_user: Add user space unwinding API with frame pointer support	2025-07-29 14:46:07 -04:00
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	…
atomic.h	locking/atomic: make atomic*_{cmp,}xchg optional	2023-06-05 09:57:14 +02:00
atomic64.h	…
audit_change_attr.h	fs/xattr: add *at family syscalls	2024-11-06 12:59:44 -05:00
audit_dir_write.h	…
audit_read.h	…
audit_signal.h	…
audit_write.h	…
barrier.h	sched: Add missing memory barrier in switch_mm_cid	2024-04-16 13:59:45 +02:00
bitops.h	include: move find.h from asm_generic to linux	2022-01-15 08:47:31 -08:00
bitsperlong.h	…
bug.h	x86/bug: Implement WARN_ONCE()	2025-11-24 20:23:25 +01:00
cache.h	…
cacheflush.h	mm: Introduce flush_cache_vmap_early()	2023-12-14 00:23:17 -08:00
cfi.h	cfi: Flip headers	2023-12-15 16:25:55 -08:00
checksum.h	asm-generic: Improve csum_fold	2024-01-17 17:52:29 -08:00
cmpxchg-local.h	asm-generic: Fix 32 bit __generic_cmpxchg_local	2024-01-05 23:19:14 +01:00
cmpxchg.h	asm-generic: avoid __generic_cmpxchg_local warnings	2023-04-04 17:58:11 +02:00
codetag.lds.h	codetag: avoid unused alloc_tags sections/symbols	2025-07-09 22:42:14 -07:00
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	delay: Fix ndelay() spuriously treated as udelay()	2024-11-29 11:40:22 +01:00
device.h	…
div64.h	__arch_xprod64(): make __always_inline when optimizing for performance	2024-10-28 21:44:28 +00:00
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: add null pointer checks to prevent NULL-pointer dereference	2025-01-13 22:40:59 -08:00
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	…
extable.h	…
fixmap.h	fixmap: Remove unused set_fixmap_offset_io()	2024-07-11 17:41:23 +02:00
flat.h	…
fprobe.h	fprobe: Add fprobe_header encoding feature	2024-12-26 10:50:05 -05:00
ftrace.h	…
futex.h	futex: Fix additional regressions	2021-12-11 23:31:51 +01:00
getorder.h	…
hardirq.h	…
hugetlb.h	mm: correctly handle UFFD PTE markers	2025-11-24 15:08:50 -08:00
hw_irq.h	…
int-ll64.h	…
io.h	asm-generic/io.h: Skip trace helpers if rwmmio events are disabled	2025-09-24 16:21:13 +02:00
ioctl.h	…
iomap.h	asm-generic/io.h: rework split ioread64/iowrite64 helpers	2025-03-01 21:00:22 +01:00
irq.h	…
irq_regs.h	…
irq_work.h	…
irqflags.h	…
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	logic_io instance of iounmap() needs volatile on argument	2021-12-21 21:31:08 +01:00
mcs_spinlock.h	locking: Move MCS struct definition to public header	2025-03-18 10:28:21 -07:00
memory_model.h	mm: convert page_to_section() to memdesc_section()	2025-09-13 16:55:07 -07:00
mm_hooks.h	mm: remove arch_unmap()	2024-09-01 20:26:13 -07:00
mmiowb.h	…
mmiowb_types.h	…
mmu.h	…
mmu_context.h	…
mmzone.h	arch, mm: move definition of node_data to generic code	2024-09-03 21:15:28 -07:00
module.h	asm-generic: Always define Elf_Rel and Elf_Rela	2025-03-26 15:56:43 -07:00
module.lds.h	…
mshyperv.h	arch/x86: mshyperv: Trap on access for some synthetic MSRs	2025-11-15 06:18:14 +00:00
msi.h	irqchip/gic-v5: Add GICv5 IWB support	2025-07-08 18:35:52 +01:00
nommu_context.h	…
numa.h	arch_numa: switch over to numa_memblks	2024-09-03 21:15:32 -07:00
param.h	alpha: regularize the situation with asm/param.h	2025-06-24 22:02:05 -04:00
parport.h	…
pci.h	asm-generic: Add new pci.h and use it	2022-07-22 17:34:57 -05:00
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
percpu.h	asm-generic: percpu: Add assembly guard	2025-10-27 16:41:53 +01:00
pgalloc.h	mm: remove unnecessary __GFP_HIGHMEM in __p*d_alloc_one_*()	2025-11-20 13:43:59 -08:00
pgtable-nop4d.h	…
pgtable-nopmd.h	mm: recover pud_leaf() definitions in nopmd case	2024-03-13 12:12:21 -07:00
pgtable-nopud.h	…
pgtable_uffd.h	mm: userfaultfd: add pgtable_supports_uffd_wp()	2025-11-24 15:08:54 -08:00
preempt.h	riscv: support PREEMPT_DYNAMIC with static keys	2023-08-31 00:18:34 -07:00
qrwlock.h	asm-generic changes for 5.19	2022-05-26 10:50:30 -07:00
qrwlock_types.h	locking/qrwlock: Change "queue rwlock" to "queued rwlock"	2022-05-11 16:27:04 +02:00
qspinlock.h	riscv: Add qspinlock support	2024-11-11 07:33:20 -08:00
qspinlock_types.h	…
resource.h	…
rqspinlock.h	rqspinlock: Fix TAS fallback lock entry creation	2026-01-23 10:03:49 -08:00
runtime-const.h	runtime constants: add default dummy infrastructure	2024-06-19 12:34:34 -07:00
rwonce.h	rwonce: fix crash by removing READ_ONCE() for unaligned read	2025-03-26 22:16:50 +01:00
seccomp.h	…
sections.h	percpu: Remove __per_cpu_load	2025-02-18 10:16:00 +01:00
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	asm-generic: Add sched.h inclusion in simd.h	2025-05-30 20:56:48 +08:00
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: Add separate ticket-lock.h	2024-11-11 07:33:17 -08:00
spinlock_types.h	asm-generic: ticket-lock: Reuse arch_spinlock_t of qspinlock	2024-11-11 07:33:16 -08:00
statfs.h	…
string.h	…
switch_to.h	…
syscall.h	syscall.h: introduce syscall_set_nr()	2025-05-11 17:48:15 -07:00
syscalls.h	syscalls: mmap(): use unsigned offset type consistently	2024-06-25 15:57:38 +02:00
text-patching.h	asm-generic: introduce text-patching.h	2024-11-07 14:25:15 -08:00
thread_info_tif.h	rseq: Switch to TIF_RSEQ if supported	2025-11-04 08:35:37 +01:00
ticket_spinlock.h	riscv: Add qspinlock support	2024-11-11 07:33:20 -08:00
timex.h	…
tlb.h	mmu_gather: move tlb flush for VM_PFNMAP/VM_MIXEDMAP vmas into free_pgtables()	2025-05-31 22:46:12 -07:00
tlbflush.h	…
topology.h	…
trace_clock.h	…
uaccess.h	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
unwind_user.h	unwind_user: Add user space unwinding API with frame pointer support	2025-07-29 14:46:07 -04:00
user.h	…
vermagic.h	…
vga.h	empty include/asm-generic/vga.h	2024-11-11 21:51:42 +01:00
video.h	arch: Rename fbdev header and source files	2024-05-03 17:07:50 +02:00
vmlinux.lds.h	Detect unused tracepoints for v6.19:	2025-12-05 09:37:41 -08:00
word-at-a-time.h	kernel.h: removed REPEAT_BYTE from kernel.h	2024-02-01 09:47:59 -08:00
xor.h	lib/xor: make xor prototypes more friendly to compiler vectorization	2022-02-11 20:39:39 +11:00