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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/um/kernel/um_arch.c
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@@ -1,6 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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- * Licensed under the GPL
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  */
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 #include <linux/delay.h>
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@@ -13,8 +13,8 @@
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 #include <linux/sched.h>
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 #include <linux/sched/task.h>
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 #include <linux/kmsg_dump.h>
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+#include <linux/suspend.h>
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-#include <asm/pgtable.h>
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 #include <asm/processor.h>
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 #include <asm/sections.h>
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 #include <asm/setup.h>
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@@ -53,7 +53,7 @@
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 };
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 union thread_union cpu0_irqstack
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-	__attribute__((__section__(".data..init_irqstack"))) =
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+	__section(".data..init_irqstack") =
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 		{ .thread_info = INIT_THREAD_INFO(init_task) };
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 /* Changed in setup_arch, which is called in early boot */
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@@ -77,7 +77,7 @@
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 static void *c_start(struct seq_file *m, loff_t *pos)
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 {
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-	return *pos < NR_CPUS ? cpu_data + *pos : NULL;
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+	return *pos < nr_cpu_ids ? cpu_data + *pos : NULL;
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 }
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 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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@@ -113,6 +113,7 @@
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 /* Set in uml_mem_setup and modified in linux_main */
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 long long physmem_size = 32 * 1024 * 1024;
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+EXPORT_SYMBOL(physmem_size);
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 static const char *usage_string =
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 "User Mode Linux v%s\n"
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@@ -358,6 +359,54 @@
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 	os_check_bugs();
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 }
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+void apply_retpolines(s32 *start, s32 *end)
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+{
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+}
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+
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+void apply_returns(s32 *start, s32 *end)
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+{
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+}
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+
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 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
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 {
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 }
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+
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+void *text_poke(void *addr, const void *opcode, size_t len)
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+{
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+	/*
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+	 * In UML, the only reference to this function is in
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+	 * apply_relocate_add(), which shouldn't ever actually call this
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+	 * because UML doesn't have live patching.
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+	 */
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+	WARN_ON(1);
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+
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+	return memcpy(addr, opcode, len);
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+}
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+
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+void text_poke_sync(void)
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+{
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+}
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+
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+#ifdef CONFIG_PM_SLEEP
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+void uml_pm_wake(void)
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+{
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+	pm_system_wakeup();
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+}
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+
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+static int init_pm_wake_signal(void)
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+{
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+	/*
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+	 * In external time-travel mode we can't use signals to wake up
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+	 * since that would mess with the scheduling. We'll have to do
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+	 * some additional work to support wakeup on virtio devices or
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+	 * similar, perhaps implementing a fake RTC controller that can
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+	 * trigger wakeup (and request the appropriate scheduling from
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+	 * the external scheduler when going to suspend.)
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+	 */
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+	if (time_travel_mode != TT_MODE_EXTERNAL)
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+		register_pm_wake_signal();
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+	return 0;
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+}
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+
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+late_initcall(init_pm_wake_signal);
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+#endif