kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/arch/powerpc/mm/mem.c
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@@ -63,6 +63,11 @@
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 unsigned long long memory_limit;
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 bool init_mem_is_free;
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+#ifdef CONFIG_HIGHMEM
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+pte_t *kmap_pte;
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+EXPORT_SYMBOL(kmap_pte);
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+#endif
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+
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 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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 			      unsigned long size, pgprot_t vma_prot)
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 {
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@@ -232,6 +237,8 @@
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 	map_kernel_page(PKMAP_BASE, 0, __pgprot(0));	/* XXX gross */
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 	pkmap_page_table = virt_to_kpte(PKMAP_BASE);
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+
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+	kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
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 #endif /* CONFIG_HIGHMEM */
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 	printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",