Re: [PATCH] powerpc/32s: Don't flush all TLBs when flushing one page

[Christophe Leroy]

Le 31/01/2020 à 16:51, Segher Boessenkool a écrit :

On Fri, Jan 31, 2020 at 03:37:34PM +0000, Christophe Leroy wrote:

When the range is a single page, do a page flush instead.

+       start &= PAGE_MASK;
+       end = (end - 1) | ~PAGE_MASK;
        if (!Hash) {
-               _tlbia();
+               if (end - start == PAGE_SIZE)
+                       _tlbie(start);
+               else
+                       _tlbia();
                return;
        }

For just one page, you get  end - start == 0  actually?

Oops, good catch.

Indeed you don't get PAGE_SIZE but (PAGE_SIZE - 1) for just one page.

Christophe