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Date: Tue, 29 Sep 2009 22:24:32 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Nigel Cunningham <ncunningham@...a.org.au>
Cc: "linux-pm" <linux-pm@...ts.linux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] Move swap functions to kernel/power/swap.c.
On Monday 28 September 2009, Nigel Cunningham wrote:
> Move hibernation code's functions for allocating and freeing swap
> from swsusp.c to swap.c, which is where you'd expect to find them.
Sorry for the delay.
Both patches look good, I'm going to add them to suspend-2.6/linux-next
in the next few days.
Thanks,
Rafael
> Signed-off-by: Nigel Cunningham <nigel@...onice.net>
> ---
> kernel/power/swap.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++
> kernel/power/swsusp.c | 101 -------------------------------------------------
> 2 files changed, 101 insertions(+), 101 deletions(-)
>
> diff --git a/kernel/power/swap.c b/kernel/power/swap.c
> index 8ba052c..ce2d8a7 100644
> --- a/kernel/power/swap.c
> +++ b/kernel/power/swap.c
> @@ -39,6 +39,107 @@ struct swsusp_header {
>
> static struct swsusp_header *swsusp_header;
>
> +/**
> + * The following functions are used for tracing the allocated
> + * swap pages, so that they can be freed in case of an error.
> + */
> +
> +struct swsusp_extent {
> + struct rb_node node;
> + unsigned long start;
> + unsigned long end;
> +};
> +
> +static struct rb_root swsusp_extents = RB_ROOT;
> +
> +static int swsusp_extents_insert(unsigned long swap_offset)
> +{
> + struct rb_node **new = &(swsusp_extents.rb_node);
> + struct rb_node *parent = NULL;
> + struct swsusp_extent *ext;
> +
> + /* Figure out where to put the new node */
> + while (*new) {
> + ext = container_of(*new, struct swsusp_extent, node);
> + parent = *new;
> + if (swap_offset < ext->start) {
> + /* Try to merge */
> + if (swap_offset == ext->start - 1) {
> + ext->start--;
> + return 0;
> + }
> + new = &((*new)->rb_left);
> + } else if (swap_offset > ext->end) {
> + /* Try to merge */
> + if (swap_offset == ext->end + 1) {
> + ext->end++;
> + return 0;
> + }
> + new = &((*new)->rb_right);
> + } else {
> + /* It already is in the tree */
> + return -EINVAL;
> + }
> + }
> + /* Add the new node and rebalance the tree. */
> + ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);
> + if (!ext)
> + return -ENOMEM;
> +
> + ext->start = swap_offset;
> + ext->end = swap_offset;
> + rb_link_node(&ext->node, parent, new);
> + rb_insert_color(&ext->node, &swsusp_extents);
> + return 0;
> +}
> +
> +/**
> + * alloc_swapdev_block - allocate a swap page and register that it has
> + * been allocated, so that it can be freed in case of an error.
> + */
> +
> +sector_t alloc_swapdev_block(int swap)
> +{
> + unsigned long offset;
> +
> + offset = swp_offset(get_swap_page_of_type(swap));
> + if (offset) {
> + if (swsusp_extents_insert(offset))
> + swap_free(swp_entry(swap, offset));
> + else
> + return swapdev_block(swap, offset);
> + }
> + return 0;
> +}
> +
> +/**
> + * free_all_swap_pages - free swap pages allocated for saving image data.
> + * It also frees the extents used to register which swap entres had been
> + * allocated.
> + */
> +
> +void free_all_swap_pages(int swap)
> +{
> + struct rb_node *node;
> +
> + while ((node = swsusp_extents.rb_node)) {
> + struct swsusp_extent *ext;
> + unsigned long offset;
> +
> + ext = container_of(node, struct swsusp_extent, node);
> + rb_erase(node, &swsusp_extents);
> + for (offset = ext->start; offset <= ext->end; offset++)
> + swap_free(swp_entry(swap, offset));
> +
> + kfree(ext);
> + }
> +}
> +
> +int swsusp_swap_in_use(void)
> +{
> + return (swsusp_extents.rb_node != NULL);
> +}
> +
> /*
> * General things
> */
> diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
> index 6a07f4d..57222d2 100644
> --- a/kernel/power/swsusp.c
> +++ b/kernel/power/swsusp.c
> @@ -58,107 +58,6 @@
> int in_suspend __nosavedata = 0;
>
> /**
> - * The following functions are used for tracing the allocated
> - * swap pages, so that they can be freed in case of an error.
> - */
> -
> -struct swsusp_extent {
> - struct rb_node node;
> - unsigned long start;
> - unsigned long end;
> -};
> -
> -static struct rb_root swsusp_extents = RB_ROOT;
> -
> -static int swsusp_extents_insert(unsigned long swap_offset)
> -{
> - struct rb_node **new = &(swsusp_extents.rb_node);
> - struct rb_node *parent = NULL;
> - struct swsusp_extent *ext;
> -
> - /* Figure out where to put the new node */
> - while (*new) {
> - ext = container_of(*new, struct swsusp_extent, node);
> - parent = *new;
> - if (swap_offset < ext->start) {
> - /* Try to merge */
> - if (swap_offset == ext->start - 1) {
> - ext->start--;
> - return 0;
> - }
> - new = &((*new)->rb_left);
> - } else if (swap_offset > ext->end) {
> - /* Try to merge */
> - if (swap_offset == ext->end + 1) {
> - ext->end++;
> - return 0;
> - }
> - new = &((*new)->rb_right);
> - } else {
> - /* It already is in the tree */
> - return -EINVAL;
> - }
> - }
> - /* Add the new node and rebalance the tree. */
> - ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);
> - if (!ext)
> - return -ENOMEM;
> -
> - ext->start = swap_offset;
> - ext->end = swap_offset;
> - rb_link_node(&ext->node, parent, new);
> - rb_insert_color(&ext->node, &swsusp_extents);
> - return 0;
> -}
> -
> -/**
> - * alloc_swapdev_block - allocate a swap page and register that it has
> - * been allocated, so that it can be freed in case of an error.
> - */
> -
> -sector_t alloc_swapdev_block(int swap)
> -{
> - unsigned long offset;
> -
> - offset = swp_offset(get_swap_page_of_type(swap));
> - if (offset) {
> - if (swsusp_extents_insert(offset))
> - swap_free(swp_entry(swap, offset));
> - else
> - return swapdev_block(swap, offset);
> - }
> - return 0;
> -}
> -
> -/**
> - * free_all_swap_pages - free swap pages allocated for saving image data.
> - * It also frees the extents used to register which swap entres had been
> - * allocated.
> - */
> -
> -void free_all_swap_pages(int swap)
> -{
> - struct rb_node *node;
> -
> - while ((node = swsusp_extents.rb_node)) {
> - struct swsusp_extent *ext;
> - unsigned long offset;
> -
> - ext = container_of(node, struct swsusp_extent, node);
> - rb_erase(node, &swsusp_extents);
> - for (offset = ext->start; offset <= ext->end; offset++)
> - swap_free(swp_entry(swap, offset));
> -
> - kfree(ext);
> - }
> -}
> -
> -int swsusp_swap_in_use(void)
> -{
> - return (swsusp_extents.rb_node != NULL);
> -}
> -
> -/**
> * swsusp_show_speed - print the time elapsed between two events represented by
> * @start and @stop
> *
>
--
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