fs: pstore: Import xiaomi pstore changes

Author: TheScarastic

fs/pstore/ram.c

@@ -43,7 +43,7 @@ module_param(record_size, ulong, 0400);
 MODULE_PARM_DESC(record_size,
 		"size of each dump done on oops/panic");
 
-static ulong ramoops_console_size = MIN_MEM_SIZE;
+static ulong ramoops_console_size = 512*1024UL;
 module_param_named(console_size, ramoops_console_size, ulong, 0400);
 MODULE_PARM_DESC(console_size, "size of kernel console log");
 
@@ -55,12 +55,12 @@ static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
 module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
 MODULE_PARM_DESC(pmsg_size, "size of user space message log");
 
-static ulong mem_address;
+static ulong mem_address = 0x9ff00000;
 module_param(mem_address, ulong, 0400);
 MODULE_PARM_DESC(mem_address,
 		"start of reserved RAM used to store oops/panic logs");
 
-static ulong mem_size;
+static ulong mem_size = 0x100000;
 module_param(mem_size, ulong, 0400);
 MODULE_PARM_DESC(mem_size,
 		"size of reserved RAM used to store oops/panic logs");

fs/pstore/ram_core.c

@@ -298,11 +298,21 @@ ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
 	return ret;
 }
 
+static void *memcpy_pstore(void *dest, const void *src, size_t count)
+{
+	char *tmp = dest;
+	const char *s = src;
+
+	while (count--)
+		*tmp++ = *s++;
+	return dest;
+}
+
 static void notrace persistent_ram_update(struct persistent_ram_zone *prz,
 	const void *s, unsigned int start, unsigned int count)
 {
 	struct persistent_ram_buffer *buffer = prz->buffer;
-	memcpy(buffer->data + start, s, count);
+	memcpy_pstore(buffer->data + start, s, count);
 	persistent_ram_update_ecc(prz, start, count);
 }