add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/oprofile/buffer_sync.c
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@@ -91,11 +91,11 @@
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 	struct mm_struct *mm = current->mm;
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 	struct vm_area_struct *mpnt;
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-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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 	mpnt = find_vma(mm, addr);
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 	if (mpnt && mpnt->vm_file && (mpnt->vm_flags & VM_EXEC)) {
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-		up_read(&mm->mmap_sem);
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+		mmap_read_unlock(mm);
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 		/* To avoid latency problems, we only process the current CPU,
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 		 * hoping that most samples for the task are on this CPU
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 		 */
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@@ -103,7 +103,7 @@
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 		return 0;
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 	}
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	return 0;
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 }
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@@ -116,7 +116,7 @@
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 {
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 #ifdef CONFIG_MODULES
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 	if (val != MODULE_STATE_COMING)
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-		return 0;
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+		return NOTIFY_DONE;
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 	/* FIXME: should we process all CPU buffers ? */
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 	mutex_lock(&buffer_mutex);
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@@ -124,7 +124,7 @@
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 	add_event_entry(MODULE_LOADED_CODE);
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 	mutex_unlock(&buffer_mutex);
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 #endif
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-	return 0;
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+	return NOTIFY_OK;
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 }
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@@ -256,7 +256,7 @@
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 	unsigned long cookie = NO_COOKIE;
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 	struct vm_area_struct *vma;
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-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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 	for (vma = find_vma(mm, addr); vma; vma = vma->vm_next) {
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 		if (addr < vma->vm_start || addr >= vma->vm_end)
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@@ -276,7 +276,7 @@
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 	if (!vma)
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 		cookie = INVALID_COOKIE;
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	return cookie;
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 }
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@@ -486,7 +486,7 @@
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 /* Sync one of the CPU's buffers into the global event buffer.
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  * Here we need to go through each batch of samples punctuated
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- * by context switch notes, taking the task's mmap_sem and doing
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+ * by context switch notes, taking the task's mmap_lock and doing
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  * lookup in task->mm->mmap to convert EIP into dcookie/offset
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  * value.
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  */