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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/kernel/profile.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  linux/kernel/profile.c
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  *  Simple profiling. Manages a direct-mapped profile hit count buffer,
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@@ -16,7 +17,7 @@
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 #include <linux/export.h>
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 #include <linux/profile.h>
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-#include <linux/bootmem.h>
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+#include <linux/memblock.h>
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 #include <linux/notifier.h>
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 #include <linux/mm.h>
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 #include <linux/cpumask.h>
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@@ -108,6 +109,13 @@
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 	/* only text is profiled */
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 	prof_len = (_etext - _stext) >> prof_shift;
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+
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+	if (!prof_len) {
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+		pr_warn("profiling shift: %u too large\n", prof_shift);
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+		prof_on = 0;
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+		return -EINVAL;
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+	}
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+
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 	buffer_bytes = prof_len*sizeof(atomic_t);
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 	if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
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@@ -336,7 +344,7 @@
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 	struct page *page;
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 	int i;
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-	if (prof_cpu_mask != NULL)
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+	if (cpumask_available(prof_cpu_mask))
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 		cpumask_clear_cpu(cpu, prof_cpu_mask);
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 	for (i = 0; i < 2; i++) {
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@@ -373,7 +381,7 @@
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 static int profile_online_cpu(unsigned int cpu)
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 {
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-	if (prof_cpu_mask != NULL)
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+	if (cpumask_available(prof_cpu_mask))
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 		cpumask_set_cpu(cpu, prof_cpu_mask);
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 	return 0;
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@@ -403,7 +411,7 @@
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 {
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 	struct pt_regs *regs = get_irq_regs();
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-	if (!user_mode(regs) && prof_cpu_mask != NULL &&
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+	if (!user_mode(regs) && cpumask_available(prof_cpu_mask) &&
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 	    cpumask_test_cpu(smp_processor_id(), prof_cpu_mask))
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 		profile_hit(type, (void *)profile_pc(regs));
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 }
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@@ -442,18 +450,18 @@
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 	return err;
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 }
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-static const struct file_operations prof_cpu_mask_proc_fops = {
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-	.open		= prof_cpu_mask_proc_open,
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-	.read		= seq_read,
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-	.llseek		= seq_lseek,
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-	.release	= single_release,
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-	.write		= prof_cpu_mask_proc_write,
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+static const struct proc_ops prof_cpu_mask_proc_ops = {
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+	.proc_open	= prof_cpu_mask_proc_open,
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+	.proc_read	= seq_read,
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+	.proc_lseek	= seq_lseek,
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+	.proc_release	= single_release,
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+	.proc_write	= prof_cpu_mask_proc_write,
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 };
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 void create_prof_cpu_mask(void)
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 {
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 	/* create /proc/irq/prof_cpu_mask */
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-	proc_create("irq/prof_cpu_mask", 0600, NULL, &prof_cpu_mask_proc_fops);
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+	proc_create("irq/prof_cpu_mask", 0600, NULL, &prof_cpu_mask_proc_ops);
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 }
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 /*
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@@ -517,10 +525,10 @@
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 	return count;
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 }
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-static const struct file_operations proc_profile_operations = {
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-	.read		= read_profile,
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-	.write		= write_profile,
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-	.llseek		= default_llseek,
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+static const struct proc_ops profile_proc_ops = {
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+	.proc_read	= read_profile,
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+	.proc_write	= write_profile,
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+	.proc_lseek	= default_llseek,
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 };
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 int __ref create_proc_profile(void)
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@@ -548,7 +556,7 @@
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 	err = 0;
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 #endif
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 	entry = proc_create("profile", S_IWUSR | S_IRUGO,
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-			    NULL, &proc_profile_operations);
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+			    NULL, &profile_proc_ops);
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 	if (!entry)
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 		goto err_state_onl;
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 	proc_set_size(entry, (1 + prof_len) * sizeof(atomic_t));