• Vineet Gupta's avatar
    atomic64: no need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE · 51a02124
    Vineet Gupta authored
    This came to light when implementing native 64-bit atomics for ARCv2.
    
    The atomic64 self-test code uses CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
    to check whether atomic64_dec_if_positive() is available.  It seems it
    was needed when not every arch defined it.  However as of current code
    the Kconfig option seems needless
    
     - for CONFIG_GENERIC_ATOMIC64 it is auto-enabled in lib/Kconfig and a
       generic definition of API is present lib/atomic64.c
     - arches with native 64-bit atomics select it in arch/*/Kconfig and
       define the API in their headers
    
    So I see no point in keeping the Kconfig option
    
    Compile tested for:
     - blackfin (CONFIG_GENERIC_ATOMIC64)
     - x86 (!CONFIG_GENERIC_ATOMIC64)
     - ia64
    
    Link: http://lkml.kernel.org/r/1473703083-8625-3-git-send-email-vgupta@synopsys.comSigned-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
    Cc: Richard Henderson <rth@twiddle.net>
    Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
    Cc: Matt Turner <mattst88@gmail.com>
    Cc: Russell King <linux@armlinux.org.uk>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
    Cc: Helge Deller <deller@gmx.de>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Chris Metcalf <cmetcalf@mellanox.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Vineet Gupta <vgupta@synopsys.com>
    Cc: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
    Cc: Linus Walleij <linus.walleij@linaro.org>
    Cc: Alexander Potapenko <glider@google.com>
    Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
    Cc: Herbert Xu <herbert@gondor.apana.org.au>
    Cc: Ming Lin <ming.l@ssi.samsung.com>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Geert Uytterhoeven <geert@linux-m68k.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Borislav Petkov <bp@suse.de>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Boqun Feng <boqun.feng@gmail.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    51a02124