Commit-ID: 3724921396dd1a07c93e3516b8d7c9ff570d17a9 Gitweb: https://git.kernel.org/tip/3724921396dd1a07c93e3516b8d7c9ff570d17a9 Author: Mark Rutland <mark.rutl...@arm.com> AuthorDate: Wed, 22 May 2019 14:22:48 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Mon, 3 Jun 2019 12:32:57 +0200
locking/atomic: Use s64 for atomic64_t on 64-bit Now that all architectures use 64 consistently as the base type for the atomic64 API, let's have the CONFIG_64BIT definition of atomic64_t use s64 as the underlying type for atomic64_t, rather than long, matching the generated headers. On architectures where atomic64_read(v) is READ_ONCE(v->counter), this patch will cause the return type of atomic64_read() to be s64. As of this patch, the atomic64 API can be relied upon to consistently return s64 where a value rather than boolean condition is returned. This should make code more robust, and simpler, allowing for the removal of casts previously required to ensure consistent types. Signed-off-by: Mark Rutland <mark.rutl...@arm.com> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Will Deacon <will.dea...@arm.com> Cc: a...@eecs.berkeley.edu Cc: a...@arndb.de Cc: b...@alien8.de Cc: catalin.mari...@arm.com Cc: da...@davemloft.net Cc: fenghua...@intel.com Cc: heiko.carst...@de.ibm.com Cc: herb...@gondor.apana.org.au Cc: i...@jurassic.park.msu.ru Cc: jho...@kernel.org Cc: li...@armlinux.org.uk Cc: matts...@gmail.com Cc: m...@ellerman.id.au Cc: pal...@sifive.com Cc: paul.bur...@mips.com Cc: pau...@samba.org Cc: r...@linux-mips.org Cc: r...@twiddle.net Cc: tony.l...@intel.com Cc: vgu...@synopsys.com Link: https://lkml.kernel.org/r/20190522132250.26499-17-mark.rutl...@arm.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- include/linux/types.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/types.h b/include/linux/types.h index 231114ae38f4..05030f608be3 100644 --- a/include/linux/types.h +++ b/include/linux/types.h @@ -174,7 +174,7 @@ typedef struct { #ifdef CONFIG_64BIT typedef struct { - long counter; + s64 counter; } atomic64_t; #endif
