Date: Wed, 22 Oct 2014 16:55:04 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org,
        Robert Richter <rric@kernel.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Mike Galbraith <efault@gmx.de>, Paul Mackerras <paulus@samba.org>,
        Stephane Eranian <eranian@google.com>, Andi Kleen <ak@linux.intel.com>,
        kan.liang@intel.com, adrian.hunter@intel.com, acme@infradead.org
Subject: Re: [PATCH v5 12/20] x86: perf: intel_pt: Intel PT PMU driver
Message-ID: <20141022145504.GX12706@worktop.programming.kicks-ass.net>
References: <1413207948-28202-1-git-send-email-alexander.shishkin@linux.intel.com>
 <1413207948-28202-13-git-send-email-alexander.shishkin@linux.intel.com>
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> +/* make negative table index stand for the last table entry */
> +#define TOPA_ENTRY(t, i) ((i) == -1 ? &(t)->table[(t)->last] : &(t)->table[(i)])

code does not match comment; negative would be: i < 0, not i == -1.

Something like: ({ if (i < 0) i += t->size; t->table[i]; }), might work,
of course that goes bang when: i !e [-size,size)
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