Commit 9be85de9 authored by Mark Rutland's avatar Mark Rutland Committed by Peter Zijlstra
Browse files

locking/atomic: make ARCH_ATOMIC a Kconfig symbol 



Subsequent patches will move architectures over to the ARCH_ATOMIC API,
after preparing the asm-generic atomic implementations to function with
or without ARCH_ATOMIC.

As some architectures use the asm-generic implementations exclusively
(and don't have a local atomic.h), and to avoid the risk that
ARCH_ATOMIC isn't defined in some cases we expect, let's make the
ARCH_ATOMIC macro a Kconfig symbol instead, so that we can guarantee it
is consistently available where needed.

There should be no functional change as a result of this patch.

Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210525140232.53872-2-mark.rutland@arm.com
parent a82adc76

arch/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -11,6 +11,9 @@ source "arch/$(SRCARCH)/Kconfig" 


menu "General architecture-dependent options"



config ARCH_ATOMIC

	bool



config CRASH_CORE

	bool

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ config ARM64 
	select ACPI_MCFG if (ACPI && PCI)

	select ACPI_SPCR_TABLE if ACPI

	select ACPI_PPTT if ACPI

	select ARCH_ATOMIC

	select ARCH_HAS_DEBUG_WX

	select ARCH_BINFMT_ELF_STATE

	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION

arch/arm64/include/asm/atomic.h

+0 −2
Original line number Diff line number Diff line
@@ -223,6 +223,4 @@ static __always_inline long arch_atomic64_dec_if_positive(atomic64_t *v) 


#define arch_atomic64_dec_if_positive		arch_atomic64_dec_if_positive



#define ARCH_ATOMIC



#endif /* __ASM_ATOMIC_H */

arch/s390/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ config S390 
	# Note: keep this list sorted alphabetically

	#

	imply IMA_SECURE_AND_OR_TRUSTED_BOOT

	select ARCH_ATOMIC

	select ARCH_32BIT_USTAT_F_TINODE

	select ARCH_BINFMT_ELF_STATE

	select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM

arch/s390/include/asm/atomic.h

+0 −2
Original line number Diff line number Diff line
@@ -147,6 +147,4 @@ ATOMIC64_OPS(xor) 
#define arch_atomic64_fetch_sub(_i, _v)  arch_atomic64_fetch_add(-(s64)(_i), _v)

#define arch_atomic64_sub(_i, _v)	 arch_atomic64_add(-(s64)(_i), _v)



#define ARCH_ATOMIC



#endif /* __ARCH_S390_ATOMIC__  */