Looks good to me.
Thanks.
Acked-by: Yasunori Goto <[email protected]>
> On Tue, Nov 27, 2007 at 10:53:45AM -0800, Dave Hansen wrote:
> >On Tue, 2007-11-27 at 10:26 +0800, WANG Cong wrote:
> >>
> >> @@ -414,7 +418,7 @@ int sparse_add_one_section(struct zone *
> >> out:
> >> pgdat_resize_unlock(pgdat, &flags);
> >> if (ret <= 0)
> >> - __kfree_section_memmap(memmap, nr_pages);
> >> + kfree(usemap);
> >> return ret;
> >> }
> >> #endif
> >
> >Why did you get rid of the memmap free here? A bad return from
> >sparse_init_one_section() indicates that we didn't use the memmap, so it
> >will leak otherwise.
>
> Sorry, I was confused by the recursion. This one should be OK.
>
> Thanks.
>
>
>
> Improve the error handling for mm/sparse.c::sparse_add_one_section(). And I
> see no reason to check 'usemap' until holding the 'pgdat_resize_lock'.
>
> Cc: Christoph Lameter <[email protected]>
> Cc: Dave Hansen <[email protected]>
> Cc: Rik van Riel <[email protected]>
> Cc: Yasunori Goto <[email protected]>
> Cc: Andy Whitcroft <[email protected]>
> Signed-off-by: WANG Cong <[email protected]>
>
> ---
> Index: linux-2.6/mm/sparse.c
> ===================================================================
> --- linux-2.6.orig/mm/sparse.c
> +++ linux-2.6/mm/sparse.c
> @@ -391,9 +391,17 @@ int sparse_add_one_section(struct zone *
> * no locking for this, because it does its own
> * plus, it does a kmalloc
> */
> - sparse_index_init(section_nr, pgdat->node_id);
> + ret = sparse_index_init(section_nr, pgdat->node_id);
> + if (ret < 0)
> + return ret;
> memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages);
> + if (!memmap)
> + return -ENOMEM;
> usemap = __kmalloc_section_usemap();
> + if (!usemap) {
> + __kfree_section_memmap(memmap, nr_pages);
> + return -ENOMEM;
> + }
>
> pgdat_resize_lock(pgdat, &flags);
>
> @@ -403,18 +411,16 @@ int sparse_add_one_section(struct zone *
> goto out;
> }
>
> - if (!usemap) {
> - ret = -ENOMEM;
> - goto out;
> - }
> ms->section_mem_map |= SECTION_MARKED_PRESENT;
>
> ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
>
> out:
> pgdat_resize_unlock(pgdat, &flags);
> - if (ret <= 0)
> + if (ret <= 0) {
> + kfree(usemap);
> __kfree_section_memmap(memmap, nr_pages);
> + }
> return ret;
> }
> #endif
--
Yasunori Goto
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