kanoj-mm24-2.3.25 nonPAE ia32 zap_low_mappings fix

Linus,

Could you please add in this patch into 2.3.26. It is needed for *(int *0) = 0 to panic (after smp_init()) to catch kernel problems.

Thanks.

Kanoj

@@ -382,7 +382,12 @@
 	 * Zap initial low-memory mappings:
 	 */
 	for (i = 0; i < USER_PTRS_PER_PGD; i++)
+#if CONFIG_X86_PAE
 		pgd_clear(swapper_pg_dir + i);
+#else
+		pmd_clear((pmd_t *)swapper_pg_dir + i);
+#endif
+	flush_tlb_all();
 }
 
 /*

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