Re: [PATCH v5 12/20] x86: perf: intel_pt: Intel PT PMU driver

[Peter Zijlstra]

> +/* 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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