[PATCH] PAE zap_low_mappings no-op

[Hugh Dickins]

i386 pgd_clear() is now a no-op with PAE as without:
so zap_low_mappings() isn't zapping in the PAE case.
Patch below against 2.4.3, or 2.4.2-ac28 offset 1 line.

Hugh

--- 2.4.3/arch/i386/mm/init.c   Mon Mar 26 20:01:56 2001
+++ linux/arch/i386/mm/init.c   Fri Mar 30 14:46:34 2001
@@ -309,14 +309,11 @@
         * Zap initial low-memory mappings.
         *
         * Note that "pgd_clear()" doesn't do it for
-        * us in this case, because pgd_clear() is a
-        * no-op in the 2-level case (pmd_clear() is
-        * the thing that clears the page-tables in
-        * that case).
+        * us, because pgd_clear() is a no-op on i386.
         */
        for (i = 0; i < USER_PTRS_PER_PGD; i++)
 #if CONFIG_X86_PAE
-               pgd_clear(swapper_pg_dir+i);
+               set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page)));
 #else
                set_pgd(swapper_pg_dir+i, __pgd(0));
 #endif

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