Re: [PATCH 0/4] amd64_edac: misc fixes

From: Andrew Morton
Date: Sat May 30 2009 - 04:41:35 EST

On Sat, 30 May 2009 10:19:54 +0200 Borislav Petkov <petkovbb@xxxxxxxxxxxxxx> wrote:

> Also, I've been thinking about how the old(er)
> toolchain problem can be addressed and one fairly doable thing would be
> if I'd query the gas version in the kernel Makefile and define popcnt
> dependent on it and for older assemblers simply slap in the opcode and
> fixate the operands in an inline assembly so that it works.

We've done that before. BUG() is one case (for other reasons), I think.

But if we have the code in there which uese the literal opcode, there's
no need to query gas or to add the conditional.

Is popcnt supported on all CPUs?
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