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hc
2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6 
 kernel/arch/x86/mm/init_32.c
....@@ -394,6 +394,19 @@
394394 	return last_map_addr;
395395 }
396396 
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+pte_t *kmap_pte;
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+
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+static void __init kmap_init(void)
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+{
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+	unsigned long kmap_vstart;
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+
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+	/*
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+	 * Cache the first kmap pte:
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+	 */
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+	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
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+	kmap_pte = virt_to_kpte(kmap_vstart);
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+}
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+
397410 #ifdef CONFIG_HIGHMEM
398411 static void __init permanent_kmaps_init(pgd_t *pgd_base)
399412 {
....@@ -699,6 +712,8 @@
699712 
700713 	__flush_tlb_all();
701714 
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+	kmap_init();
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+
702717 	/*
703718 	 * NOTE: at this point the bootmem allocator is fully available.
704719 	 */