Re: [PATCH -V10 10/15] powerpc: Prevent gcc to re-read the pagetables

On Wed, 2013-06-05 at 16:41 +0100, David Laight wrote:

quoted

 	ptep = pte_offset_kernel(&pmd, addr);
 	do {
-		pte_t pte = *ptep;
+		pte_t pte = ACCESS_ONCE(*ptep);

Why not just define ptep as a 'pointer to volatile'?

ACCESS_ONCE is the proper way to do it in Linux. pointer to volatile
can have ... interesting semantics.

Cheers,
Ben.