update kernel to 5.10.198

hc

2024-01-03 2f7c68cb55ecb7331f2381deb497c27155f32faf

 kernel/arch/arm/mm/nommu.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  *  linux/arch/arm/mm/nommu.c
3
4
  *
..
..
@@ -24,6 +25,13 @@
24
25
 #include "mm.h"
25
26
 
26
27
 unsigned long vectors_base;
28
+
29
+/*
30
+ * empty_zero_page is a special page that is used for
31
+ * zero-initialized data and COW.
32
+ */
33
+struct page *empty_zero_page;
34
+EXPORT_SYMBOL(empty_zero_page);
27
35
 
28
36
 #ifdef CONFIG_ARM_MPU
29
37
 struct mpu_rgn_info mpu_rgn_info;
..
..
@@ -147,9 +155,21 @@
147
155
  */
148
156
 void __init paging_init(const struct machine_desc *mdesc)
149
157
 {
158
+	void *zero_page;
159
+
150
160
 	early_trap_init((void *)vectors_base);
151
161
 	mpu_setup();
162
+
163
+	/* allocate the zero page. */
164
+	zero_page = (void *)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
165
+	if (!zero_page)
166
+		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
167
+		      __func__, PAGE_SIZE, PAGE_SIZE);
168
+
152
169
 	bootmem_init();
170
+
171
+	empty_zero_page = virt_to_page(zero_page);
172
+	flush_dcache_page(empty_zero_page);
153
173
 }
154
174
 
155
175
 /*
..
..
@@ -205,15 +225,11 @@
205
225
 EXPORT_SYMBOL(ioremap);
206
226
 
207
227
 void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
208
-	__alias(ioremap_cached);
209
-
210
-void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size)
211
228
 {
212
229
 	return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
213
230
 				    __builtin_return_address(0));
214
231
 }
215
232
 EXPORT_SYMBOL(ioremap_cache);
216
-EXPORT_SYMBOL(ioremap_cached);
217
233
 
218
234
 void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
219
235
 {