Re: [RFC][PATCH -mm 5/5] swsusp: Introduce some helpful constants
From: Pavel Machek
Date: Wed Aug 09 2006 - 06:34:11 EST
On Wed 2006-08-09 12:13:18, Rafael J. Wysocki wrote:
> Introduce some constants that hopefully will help improve the readability kernel/power/snapshot.c | 45 +++++++++++++++++++++++++--------------------
> 1 files changed, 25 insertions(+), 20 deletions(-)
>
You probably want to add signed-off-by:... aha, it is below the
patch. Some script went crazy inserting diff at wrong place. Otherwise
ACK.
Pavel
> Index: linux-2.6.18-rc3-mm2/kernel/power/snapshot.c
> ===================================================================
> --- linux-2.6.18-rc3-mm2.orig/kernel/power/snapshot.c
> +++ linux-2.6.18-rc3-mm2/kernel/power/snapshot.c
> @@ -57,6 +57,11 @@ static void *buffer;
> * so that swsusp_free() can release it.
> */
>
> +#define PG_ANY 0
> +#define PG_SAFE 1
> +#define PG_UNSAFE_CLEAR 1
> +#define PG_UNSAFE_KEEP 0
> +
> static unsigned int allocated_unsafe_pages;
>
> static void *get_image_page(gfp_t gfp_mask, int safe_needed)
> @@ -357,7 +362,7 @@ create_memory_bm(struct memory_bitmap *b
> zone_bm = create_zone_bm_list(nr, &ca);
> bm->zone_bm_list = zone_bm;
> if (!zone_bm) {
> - chain_free(&ca, 1);
> + chain_free(&ca, PG_UNSAFE_CLEAR);
> return -ENOMEM;
> }
>
> @@ -410,7 +415,7 @@ create_memory_bm(struct memory_bitmap *b
>
> Free:
> bm->p_list = ca.chain;
> - free_memory_bm(bm, 1);
> + free_memory_bm(bm, PG_UNSAFE_CLEAR);
> return -ENOMEM;
> }
>
> @@ -936,15 +941,15 @@ swsusp_alloc(struct memory_bitmap *orig_
> {
> int error;
>
> - error = create_memory_bm(orig_bm, GFP_ATOMIC, 0);
> + error = create_memory_bm(orig_bm, GFP_ATOMIC, PG_ANY);
> if (error)
> goto Free;
>
> - error = create_memory_bm(copy_bm, GFP_ATOMIC, 0);
> + error = create_memory_bm(copy_bm, GFP_ATOMIC, PG_ANY);
> if (error)
> goto Free;
>
> - error = get_highmem_buffer(0);
> + error = get_highmem_buffer(PG_ANY);
> if (error)
> goto Free;
>
> @@ -1078,7 +1083,7 @@ int snapshot_read_next(struct snapshot_h
>
> if (!buffer) {
> /* This makes the buffer be freed by swsusp_free() */
> - buffer = get_image_page(GFP_ATOMIC, 0);
> + buffer = get_image_page(GFP_ATOMIC, PG_ANY);
> if (!buffer)
> return -ENOMEM;
> }
> @@ -1299,10 +1304,10 @@ prepare_highmem_image(struct memory_bitm
> {
> unsigned int to_alloc;
>
> - if (create_memory_bm(bm, GFP_ATOMIC, 1))
> + if (create_memory_bm(bm, GFP_ATOMIC, PG_SAFE))
> return -ENOMEM;
>
> - if (get_highmem_buffer(1))
> + if (get_highmem_buffer(PG_SAFE))
> return -ENOMEM;
>
> to_alloc = count_free_highmem_pages();
> @@ -1415,8 +1420,8 @@ static inline int last_highmem_page_copi
>
> static inline void free_highmem_data(void)
> {
> - free_memory_bm(safe_highmem_bm, 1);
> - free_image_page(buffer, 1);
> + free_memory_bm(safe_highmem_bm, PG_UNSAFE_CLEAR);
> + free_image_page(buffer, PG_UNSAFE_CLEAR);
> }
> #else
> static inline int get_safe_write_buffer(void) { return 0; }
> @@ -1465,19 +1470,19 @@ prepare_image(struct memory_bitmap *new_
> int error;
>
> /* If there is no highmem, the buffer will not be necessary */
> - free_image_page(buffer, 1);
> + free_image_page(buffer, PG_UNSAFE_CLEAR);
>
> nr_highmem = count_highmem_image_pages(bm);
> error = mark_unsafe_pages(bm);
> if (error)
> goto Free;
>
> - error = create_memory_bm(new_bm, GFP_ATOMIC, 1);
> + error = create_memory_bm(new_bm, GFP_ATOMIC, PG_SAFE);
> if (error)
> goto Free;
>
> duplicate_memory_bitmap(new_bm, bm);
> - free_memory_bm(bm, 0);
> + free_memory_bm(bm, PG_UNSAFE_KEEP);
> if (nr_highmem > 0) {
> error = prepare_highmem_image(bm, &nr_highmem);
> if (error)
> @@ -1494,7 +1499,7 @@ prepare_image(struct memory_bitmap *new_
> nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages;
> nr_pages = DIV_ROUND_UP(nr_pages, PBES_PER_LINKED_PAGE);
> while (nr_pages > 0) {
> - lp = get_image_page(GFP_ATOMIC, 1);
> + lp = get_image_page(GFP_ATOMIC, PG_SAFE);
> if (!lp) {
> error = -ENOMEM;
> goto Free;
> @@ -1525,7 +1530,7 @@ prepare_image(struct memory_bitmap *new_
> /* Free the reserved safe pages so that chain_alloc() can use them */
> while (sp_list) {
> lp = sp_list->next;
> - free_image_page(sp_list, 1);
> + free_image_page(sp_list, PG_UNSAFE_CLEAR);
> sp_list = lp;
> }
> return 0;
> @@ -1604,7 +1609,7 @@ int snapshot_write_next(struct snapshot_
> if (handle->offset == 0) {
> if (!buffer)
> /* This makes the buffer be freed by swsusp_free() */
> - buffer = get_image_page(GFP_ATOMIC, 0);
> + buffer = get_image_page(GFP_ATOMIC, PG_ANY);
>
> if (!buffer)
> return -ENOMEM;
> @@ -1618,7 +1623,7 @@ int snapshot_write_next(struct snapshot_
> if (error)
> return error;
>
> - error = create_memory_bm(©_bm, GFP_ATOMIC, 0);
> + error = create_memory_bm(©_bm, GFP_ATOMIC, PG_ANY);
> if (error)
> return error;
>
> @@ -1668,7 +1673,7 @@ void snapshot_write_finalize(struct snap
> copy_last_highmem_page();
> /* Free only if we have loaded the image entirely */
> if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages) {
> - free_memory_bm(&orig_bm, 1);
> + free_memory_bm(&orig_bm, PG_UNSAFE_CLEAR);
> free_highmem_data();
> }
> }
> @@ -1710,7 +1715,7 @@ int restore_highmem(void)
> struct highmem_pbe *pbe = highmem_pblist;
> void *buf;
>
> - buf = get_image_page(GFP_ATOMIC, 1);
> + buf = get_image_page(GFP_ATOMIC, PG_SAFE);
> if (!buf)
> return -ENOMEM;
>
> @@ -1718,7 +1723,7 @@ int restore_highmem(void)
> swap_two_pages_data(pbe->copy_page, pbe->orig_page, buf);
> pbe = pbe->next;
> }
> - free_image_page(buf, 1);
> + free_image_page(buf, PG_UNSAFE_CLEAR);
> return 0;
> }
> #endif /* CONFIG_HIGHMEM */
>
> of the code.
>
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> ---
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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