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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/tty/serial/dz.c
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@@ -29,10 +29,6 @@
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 #undef DEBUG_DZ
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-#if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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-#define SUPPORT_SYSRQ
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-#endif
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-
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 #include <linux/bitops.h>
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 #include <linux/compiler.h>
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 #include <linux/console.h>
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@@ -677,7 +673,7 @@
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 static int dz_map_port(struct uart_port *uport)
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 {
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 	if (!uport->membase)
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-		uport->membase = ioremap_nocache(uport->mapbase,
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+		uport->membase = ioremap(uport->mapbase,
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 						 dec_kn_slot_size);
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 	if (!uport->membase) {
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 		printk(KERN_ERR "dz: Cannot map MMIO\n");
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@@ -787,6 +783,7 @@
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 		uport->ops	= &dz_ops;
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 		uport->line	= line;
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 		uport->mapbase	= base;
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+		uport->has_sysrq = IS_ENABLED(CONFIG_SERIAL_DZ_CONSOLE);
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 	}
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 }
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