add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/arch/x86/mm/iomap_32.c
..
..
@@ -59,6 +59,7 @@
59
59
 
60
60
 void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
61
61
 {
62
+	pte_t pte = pfn_pte(pfn, prot);
62
63
 	unsigned long vaddr;
63
64
 	int idx, type;
64
65
 
..
..
@@ -68,7 +69,12 @@
68
69
 	type = kmap_atomic_idx_push();
69
70
 	idx = type + KM_TYPE_NR * smp_processor_id();
70
71
 	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
71
-	set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
72
+	WARN_ON(!pte_none(*(kmap_pte - idx)));
73
+
74
+#ifdef CONFIG_PREEMPT_RT_FULL
75
+	current->kmap_pte[type] = pte;
76
+#endif
77
+	set_pte(kmap_pte - idx, pte);
72
78
 	arch_flush_lazy_mmu_mode();
73
79
 
74
80
 	return (void *)vaddr;
..
..
@@ -119,6 +125,9 @@
119
125
 		 * is a bad idea also, in case the page changes cacheability
120
126
 		 * attributes or becomes a protected page in a hypervisor.
121
127
 		 */
128
+#ifdef CONFIG_PREEMPT_RT_FULL
129
+		current->kmap_pte[type] = __pte(0);
130
+#endif
122
131
 		kpte_clear_flush(kmap_pte-idx, vaddr);
123
132
 		kmap_atomic_idx_pop();
124
133
 	}