Re: [PATCH 2/5] atomic: introduce atomic_inc_not_zero

From: Nick Piggin (nickpiggin_at_yahoo.com.au)
Date: 09/15/05

  • Next message: Andrea Arcangeli: "Re: git tag in localversion" 
    Date:	Thu, 15 Sep 2005 11:51:24 +1000
To: Russell King <rmk+lkml@arm.linux.org.uk>

    Russell King wrote:

    > The whole point about architecture specific includes is not to provide
    > a frenzied feeding ground for folk who like to "clean code up" but to
    > allow architectures to do things in the most efficient way for them
    > without polluting the kernel too much.
    >
    > It seems that aspect is being lost sight of here.
    >

    Yep. We've got atomic_add, atomic_sub, atomic_inc, atomic_dec,
    atomic_inc_return, atomic_add_return, atomic_dec_return, atomic_sub_return
    to start with.

    Not only that, but we can probably emulate all the atomic_ operations
    with atomic_cmpxchg, not just atomic_inc_not_zero.

    Roman: any ideas about what you would prefer? You'll notice
    atomic_inc_not_zero replaces rcuref_inc_lf, which is used several times
    in the VFS.

    Thanks,
    Nick 

    -- 
SUSE Labs, Novell Inc.
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