修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/fs/proc/task_nommu.c
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@@ -25,7 +25,7 @@
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 	struct rb_node *p;
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 	unsigned long bytes = 0, sbytes = 0, slack = 0, size;
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-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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 	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
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 		vma = rb_entry(p, struct vm_area_struct, vm_rb);
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@@ -64,7 +64,7 @@
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 	else
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 		bytes += kobjsize(current->files);
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-	if (current->sighand && atomic_read(&current->sighand->count) > 1)
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+	if (current->sighand && refcount_read(&current->sighand->count) > 1)
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 		sbytes += kobjsize(current->sighand);
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 	else
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 		bytes += kobjsize(current->sighand);
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@@ -77,7 +77,7 @@
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 		"Shared:\t%8lu bytes\n",
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 		bytes, slack, sbytes);
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 }
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 unsigned long task_vsize(struct mm_struct *mm)
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@@ -86,12 +86,12 @@
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 	struct rb_node *p;
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 	unsigned long vsize = 0;
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-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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 	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
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 		vma = rb_entry(p, struct vm_area_struct, vm_rb);
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 		vsize += vma->vm_end - vma->vm_start;
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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 vsize;
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 }
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@@ -104,7 +104,7 @@
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 	struct rb_node *p;
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 	unsigned long size = kobjsize(mm);
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-	down_read(&mm->mmap_sem);
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+	mmap_read_lock(mm);
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 	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
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 		vma = rb_entry(p, struct vm_area_struct, vm_rb);
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 		size += kobjsize(vma);
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@@ -119,7 +119,7 @@
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 		>> PAGE_SHIFT;
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 	*data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
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 		>> PAGE_SHIFT;
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-	up_read(&mm->mmap_sem);
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+	mmap_read_unlock(mm);
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 	size >>= PAGE_SHIFT;
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 	size += *text + *data;
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 	*resident = size;
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@@ -178,7 +178,7 @@
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 		seq_file_path(m, file, "");
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 	} else if (mm && is_stack(vma)) {
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 		seq_pad(m, ' ');
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-		seq_printf(m, "[stack]");
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+		seq_puts(m, "[stack]");
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 	}
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 	seq_putc(m, '\n');
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@@ -208,11 +208,16 @@
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 		return ERR_PTR(-ESRCH);
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 	mm = priv->mm;
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-	if (!mm || !mmget_not_zero(mm))
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+	if (!mm || !mmget_not_zero(mm)) {
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+		put_task_struct(priv->task);
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+		priv->task = NULL;
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 		return NULL;
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+	}
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-	if (down_read_killable(&mm->mmap_sem)) {
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+	if (mmap_read_lock_killable(mm)) {
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 		mmput(mm);
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+		put_task_struct(priv->task);
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+		priv->task = NULL;
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 		return ERR_PTR(-EINTR);
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 	}
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@@ -221,23 +226,21 @@
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 		if (n-- == 0)
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 			return p;
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-	up_read(&mm->mmap_sem);
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-	mmput(mm);
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 	return NULL;
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 }
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-static void m_stop(struct seq_file *m, void *_vml)
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+static void m_stop(struct seq_file *m, void *v)
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 {
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 	struct proc_maps_private *priv = m->private;
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+	struct mm_struct *mm = priv->mm;
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-	if (!IS_ERR_OR_NULL(_vml)) {
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-		up_read(&priv->mm->mmap_sem);
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-		mmput(priv->mm);
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-	}
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-	if (priv->task) {
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-		put_task_struct(priv->task);
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-		priv->task = NULL;
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-	}
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+	if (!priv->task)
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+		return;
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+
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+	mmap_read_unlock(mm);
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+	mmput(mm);
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+	put_task_struct(priv->task);
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+	priv->task = NULL;
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 }
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 static void *m_next(struct seq_file *m, void *_p, loff_t *pos)