Re: [PATCH v7 3.2-rc2 1/30] uprobes: Auxillary routines to insert,find, delete uprobes

[Peter Zijlstra]

On Fri, 2011-11-18 at 16:36 +0530, Srikar Dronamraju wrote:
> +static struct uprobe *alloc_uprobe(struct inode *inode, loff_t offset)
> +{
> +       struct uprobe *uprobe, *cur_uprobe;
> +
> +       uprobe = kzalloc(sizeof(struct uprobe), GFP_KERNEL);
> +       if (!uprobe)
> +               return NULL;
> +
> +       uprobe->inode = igrab(inode);
> +       uprobe->offset = offset;
> +
> +       /* add to uprobes_tree, sorted on inode:offset */
> +       cur_uprobe = insert_uprobe(uprobe);
> +
> +       /* a uprobe exists for this inode:offset combination */
> +       if (cur_uprobe) {
> +               kfree(uprobe);
> +               uprobe = cur_uprobe;
> +               iput(inode);
> +       }
> +       return uprobe;
> +} 

A function called alloc that actually publishes the object is weird.
Usually those things are separated. Alloc does the memory allocation and
sometimes initialization like things, but it never publishes the thing.

This leads to slightly weird code later on. Its not wrong, just weird
and makes reading this stuff slightly more challenging than needed.


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