From: Linus Torvalds <torvalds@linux-foundation.org>
To: mingo@redhat.com, hpa@zytor.com, paulus@samba.org,
acme@redhat.com, linux-kernel@vger.kernel.org,
eric.dumazet@gmail.com, a.p.zijlstra@chello.nl, efault@gmx.de,
arnd@arndb.de, fweisbec@gmail.com, dhowells@redhat.com,
akpm@linux-foundation.org, tglx@linutronix.de, mingo@elte.hu
Subject: Re: [tip:perfcounters/urgent] x86: atomic64: Move the 32-bit atomic64_t implementation to a .c file
Date: Fri, 3 Jul 2009 09:47:00 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.01.0907030942260.3210@localhost.localdomain> (raw)
In-Reply-To: <tip-b7882b7c65abb00194bdb3d4a22d27d70fcc59ba@git.kernel.org>
On Fri, 3 Jul 2009, tip-bot for Ingo Molnar wrote:
> +int atomic64_add_negative(u64 delta, atomic64_t *ptr)
> +{
> + long long old_val = atomic64_add_return(delta, ptr);
> +
> + return old_val < 0;
> +}
Can we please fix this horribly mis-named 'old_val' variable?
It's not 'old_val'. It should be 'new_val' or 'result'.
As it is, the above looks very wrong, and made me think that you had done
the wrong semantics (ie "xadd" like semantics that literally return the
pre-add 'old' value).
But on closer inspection, it looks like the code is correct, but the
naming is just totally wrong.
Linus
next prev parent reply other threads:[~2009-07-03 16:48 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-30 21:24 [PATCH] FRV: Wire up new syscalls David Howells
2009-06-30 21:34 ` Ingo Molnar
2009-06-30 21:41 ` Arnd Bergmann
2009-06-30 21:54 ` Ingo Molnar
2009-07-01 11:28 ` David Howells
2009-07-01 11:54 ` Ingo Molnar
2009-07-01 12:19 ` David Howells
2009-07-01 12:36 ` Paul Mackerras
2009-07-01 12:41 ` David Howells
2009-07-01 13:13 ` Ingo Molnar
2009-07-01 14:10 ` David Howells
2009-07-01 14:49 ` Ingo Molnar
2009-07-01 16:47 ` [PATCH 1/2] FRV: Implement atomic64_t David Howells
2009-07-01 17:20 ` Linus Torvalds
2009-07-01 21:11 ` Ingo Molnar
2009-07-01 22:57 ` [PATCH] x86: Code atomic(64)_read and atomic(64)_set in C not CPP [was Re: FRV: Implement atomic64_t] Paul Mackerras
2009-07-02 7:21 ` [tip:x86/urgent] x86: Code atomic(64)_read and atomic(64)_set in C not CPP tip-bot for Paul Mackerras
2009-07-02 7:21 ` [PATCH] x86: Code atomic(64)_read and atomic(64)_set in C not CPP [was Re: FRV: Implement atomic64_t] Ingo Molnar
2009-07-01 23:46 ` [PATCH 1/2] FRV: Implement atomic64_t [ver #2] David Howells
2009-07-01 23:46 ` [PATCH 2/2] FRV: Add basic performance counter support " David Howells
2009-07-02 21:10 ` [PATCH 1/2] FRV: Implement atomic64_t Eric Dumazet
2009-07-02 21:28 ` Linus Torvalds
2009-07-02 22:08 ` [PATCH] x86: atomic64_t should be 8 bytes aligned Eric Dumazet
2009-07-02 23:53 ` Linus Torvalds
2009-07-03 6:14 ` Ingo Molnar
2009-07-03 12:42 ` [tip:perfcounters/urgent] x86: atomic64: The atomic64_t data type should be 8 bytes aligned on 32-bit too tip-bot for Eric Dumazet
2009-07-03 16:58 ` Linus Torvalds
2009-07-03 17:49 ` H. Peter Anvin
2009-07-03 12:42 ` [tip:perfcounters/urgent] x86: atomic64: Move the 32-bit atomic64_t implementation to a .c file tip-bot for Ingo Molnar
2009-07-03 16:47 ` Linus Torvalds [this message]
2009-07-03 18:31 ` [tip:perfcounters/urgent] x86: atomic64: Clean up atomic64_sub_and_test() and atomic64_add_negative() tip-bot for Ingo Molnar
2009-07-03 19:18 ` tip-bot for Ingo Molnar
2009-07-04 0:05 ` [tip:perfcounters/urgent] x86: atomic64: Move the 32-bit atomic64_t implementation to a .c file Paul Mackerras
2009-07-05 11:25 ` Ingo Molnar
2009-07-03 12:43 ` [tip:perfcounters/urgent] x86: atomic64: Improve atomic64_read() tip-bot for Eric Dumazet
2009-07-03 12:43 ` [tip:perfcounters/urgent] x86: atomic64: Improve cmpxchg8b() tip-bot for Eric Dumazet
2009-07-03 12:43 ` [tip:perfcounters/urgent] x86: atomic64: Improve atomic64_add_return() tip-bot for Ingo Molnar
2009-07-03 12:43 ` [tip:perfcounters/urgent] x86: atomic64: Reduce size of functions tip-bot for Ingo Molnar
2009-07-03 12:44 ` [tip:perfcounters/urgent] x86: atomic64: Fix unclean type use in atomic64_xchg() tip-bot for Ingo Molnar
2009-07-03 17:02 ` Linus Torvalds
2009-07-03 18:00 ` Ingo Molnar
2009-07-03 12:44 ` [tip:perfcounters/urgent] x86: atomic64: Improve atomic64_read() tip-bot for Eric Dumazet
2009-07-03 14:50 ` [PATCH -tip] x86: atomic64: inline atomic64_read() Eric Dumazet
2009-07-03 18:04 ` Ingo Molnar
2009-07-03 18:10 ` Arjan van de Ven
2009-07-03 18:18 ` Ingo Molnar
2009-07-03 18:25 ` Andi Kleen
2009-07-03 18:30 ` Arjan van de Ven
2009-07-03 18:43 ` Ingo Molnar
2009-07-03 18:24 ` Andi Kleen
2009-07-03 18:31 ` [tip:perfcounters/urgent] x86: atomic64: Optimize CMPXCHG8B sequences to not use the LOCK prefix tip-bot for Ingo Molnar
2009-07-03 18:45 ` Ingo Molnar
2009-07-03 19:10 ` [PATCH -tip] x86: atomic64: inline atomic64_read() Linus Torvalds
2009-07-03 19:17 ` Ingo Molnar
2009-07-03 19:38 ` Linus Torvalds
2009-07-03 21:40 ` Ingo Molnar
2009-07-03 18:31 ` [tip:perfcounters/urgent] x86: atomic64: Inline atomic64_read() again tip-bot for Eric Dumazet
2009-07-03 19:18 ` tip-bot for Eric Dumazet
2009-07-04 9:49 ` tip-bot for Eric Dumazet
2009-07-03 12:44 ` [tip:perfcounters/urgent] x86: atomic64: Code atomic(64)_read and atomic(64)_set in C not CPP tip-bot for Paul Mackerras
2009-07-03 12:48 ` tip-bot for Paul Mackerras
2009-07-03 12:48 ` [tip:perfcounters/urgent] x86: atomic64: Improve atomic64_read() tip-bot for Eric Dumazet
2009-07-03 15:33 ` [tip:perfcounters/urgent] x86: atomic64: Export APIs to modules tip-bot for Ingo Molnar
2009-07-03 18:30 ` tip-bot for Ingo Molnar
2009-07-03 18:30 ` [tip:perfcounters/urgent] x86: atomic64: Improve atomic64_xchg() tip-bot for Ingo Molnar
2009-07-03 12:01 ` [patch] x86: atomic64_t: Improve atomic64_add_return() Ingo Molnar
2009-07-03 12:26 ` [PATCH] x86: atomic64_t: _cmpxchg() & _read() optimizations Eric Dumazet
2009-07-03 12:40 ` Ingo Molnar
2009-07-03 17:38 ` [patch] x86: atomic64_t: Improve atomic64_add_return() Linus Torvalds
2009-07-03 6:05 ` [PATCH 1/2] FRV: Implement atomic64_t Eric Dumazet
2009-07-03 12:27 ` Ingo Molnar
2009-07-03 12:39 ` Eric Dumazet
2009-07-03 11:17 ` Ingo Molnar
2009-07-03 11:26 ` Ingo Molnar
2009-07-01 17:33 ` David Howells
2009-07-01 23:48 ` David Howells
2009-07-01 16:47 ` [PATCH 2/2] FRV: Add basic performance counter support David Howells
2009-07-01 21:10 ` Ingo Molnar
2009-07-01 15:19 ` [PATCH] FRV: Wire up new syscalls David Howells
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