Glauber de Oliveira Costa wrote:
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Andreas Herrmann3 escreveu:
On Thu, Nov 01, 2007 at 06:35:43PM +0100, Andreas Herrmann3 wrote:
On Thu, Nov 01, 2007 at 03:12:25PM -0200, Glauber de Oliveira Costa wrote:
So it could even work, but as accident. Unless I'm wrong about it, I'd
prefer to see an explicit attribution of cpu_index = 0 somewhere for the
boot cpu.
Hmm, will look at this as well.
BTW, isn't it zero initialized anyway?
So, no need to explicitely set cpuinfo->cpu_index=0 for the boot cpu.
Well, it should be, but as far as I know it is not exactly a guarantee
given by all compilers. So it should be safer to do it explicitly, with
no prejudice. Unless it's really guaranteed. If it is, yeah, no need.
Any uninitialized field in a static section (.data or .bss) is
guaranteed to be initialized to zero. This is guaranteed by the C
standard. In the former case, it is the responsibility of the compiler
and in the latter by the runtime.
The Linux percpu handling creates a .data.percpu section which is then
replicated into each of the CPU data blocks; thus, percpu data counts as
static data for this purpose, and initialization is guaranteed.
-hpa
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