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bc6cb4d5bc
- Introduce cmpxchg128() -- aka. the demise of cmpxchg_double().
The cmpxchg128() family of functions is basically & functionally
the same as cmpxchg_double(), but with a saner interface: instead
of a 6-parameter horror that forced u128 - u64/u64-halves layout
details on the interface and exposed users to complexity,
fragility & bugs, use a natural 3-parameter interface with u128 types.
- Restructure the generated atomic headers, and add
kerneldoc comments for all of the generic atomic{,64,_long}_t
operations. Generated definitions are much cleaner now,
and come with documentation.
- Implement lock_set_cmp_fn() on lockdep, for defining an ordering
when taking multiple locks of the same type. This gets rid of
one use of lockdep_set_novalidate_class() in the bcache code.
- Fix raw_cpu_generic_try_cmpxchg() bug due to an unintended
variable shadowing generating garbage code on Clang on certain
ARM builds.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-core-2023-06-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
- Introduce cmpxchg128() -- aka. the demise of cmpxchg_double()
The cmpxchg128() family of functions is basically & functionally the
same as cmpxchg_double(), but with a saner interface.
Instead of a 6-parameter horror that forced u128 - u64/u64-halves
layout details on the interface and exposed users to complexity,
fragility & bugs, use a natural 3-parameter interface with u128
types.
- Restructure the generated atomic headers, and add kerneldoc comments
for all of the generic atomic{,64,_long}_t operations.
The generated definitions are much cleaner now, and come with
documentation.
- Implement lock_set_cmp_fn() on lockdep, for defining an ordering when
taking multiple locks of the same type.
This gets rid of one use of lockdep_set_novalidate_class() in the
bcache code.
- Fix raw_cpu_generic_try_cmpxchg() bug due to an unintended variable
shadowing generating garbage code on Clang on certain ARM builds.
* tag 'locking-core-2023-06-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (43 commits)
locking/atomic: scripts: fix ${atomic}_dec_if_positive() kerneldoc
percpu: Fix self-assignment of __old in raw_cpu_generic_try_cmpxchg()
locking/atomic: treewide: delete arch_atomic_*() kerneldoc
locking/atomic: docs: Add atomic operations to the driver basic API documentation
locking/atomic: scripts: generate kerneldoc comments
docs: scripts: kernel-doc: accept bitwise negation like ~@var
locking/atomic: scripts: simplify raw_atomic*() definitions
locking/atomic: scripts: simplify raw_atomic_long*() definitions
locking/atomic: scripts: split pfx/name/sfx/order
locking/atomic: scripts: restructure fallback ifdeffery
locking/atomic: scripts: build raw_atomic_long*() directly
locking/atomic: treewide: use raw_atomic*_<op>()
locking/atomic: scripts: add trivial raw_atomic*_<op>()
locking/atomic: scripts: factor out order template generation
locking/atomic: scripts: remove leftover "${mult}"
locking/atomic: scripts: remove bogus order parameter
locking/atomic: xtensa: add preprocessor symbols
locking/atomic: x86: add preprocessor symbols
locking/atomic: sparc: add preprocessor symbols
locking/atomic: sh: add preprocessor symbols
...
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| .. | ||
| agp_backend.h | ||
| asm-prototypes.h | ||
| atomic.h | ||
| barrier.h | ||
| bitops.h | ||
| bug.h | ||
| cache.h | ||
| cacheflush.h | ||
| checksum.h | ||
| cmpxchg.h | ||
| compiler.h | ||
| console.h | ||
| core_apecs.h | ||
| core_cia.h | ||
| core_irongate.h | ||
| core_lca.h | ||
| core_marvel.h | ||
| core_mcpcia.h | ||
| core_polaris.h | ||
| core_t2.h | ||
| core_titan.h | ||
| core_tsunami.h | ||
| core_wildfire.h | ||
| delay.h | ||
| device.h | ||
| dma-mapping.h | ||
| dma.h | ||
| elf.h | ||
| emergency-restart.h | ||
| err_common.h | ||
| err_ev6.h | ||
| err_ev7.h | ||
| extable.h | ||
| floppy.h | ||
| fpu.h | ||
| ftrace.h | ||
| futex.h | ||
| gct.h | ||
| hardirq.h | ||
| hw_irq.h | ||
| hwrpb.h | ||
| io_trivial.h | ||
| io.h | ||
| irq.h | ||
| irqflags.h | ||
| jensen.h | ||
| Kbuild | ||
| linkage.h | ||
| local.h | ||
| machvec.h | ||
| mc146818rtc.h | ||
| mce.h | ||
| mmu_context.h | ||
| mmu.h | ||
| module.h | ||
| page.h | ||
| pal.h | ||
| param.h | ||
| parport.h | ||
| pci.h | ||
| percpu.h | ||
| perf_event.h | ||
| pgalloc.h | ||
| pgtable.h | ||
| processor.h | ||
| ptrace.h | ||
| rwonce.h | ||
| serial.h | ||
| setup.h | ||
| sfp-machine.h | ||
| shmparam.h | ||
| signal.h | ||
| smp.h | ||
| socket.h | ||
| sparsemem.h | ||
| special_insns.h | ||
| spinlock_types.h | ||
| spinlock.h | ||
| string.h | ||
| switch_to.h | ||
| syscall.h | ||
| thread_info.h | ||
| timex.h | ||
| tlb.h | ||
| tlbflush.h | ||
| topology.h | ||
| types.h | ||
| uaccess.h | ||
| ucontext.h | ||
| unistd.h | ||
| user.h | ||
| vga.h | ||
| vmalloc.h | ||
| word-at-a-time.h | ||
| wrperfmon.h | ||
| xchg.h | ||
| xor.h | ||