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Subject[Suspend2][ 02/13] [Suspend2] Allocate compression buffers.
Date
The compression module uses a couple of local buffers to cache partially
filled output pages, and to receive the cryptoapi output. These routines
are responsible for allocating and freeing those buffers.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

kernel/power/compression.c | 53 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 53 insertions(+), 0 deletions(-)

diff --git a/kernel/power/compression.c b/kernel/power/compression.c
index 72075d7..3d222b3 100644
--- a/kernel/power/compression.c
+++ b/kernel/power/compression.c
@@ -39,3 +39,56 @@ static unsigned int bufofs;

static int position = 0;

+/* ---- Local buffer management ---- */
+
+/*
+ * suspend_compress_allocate_local_buffer
+ *
+ * Allocates a page of memory for buffering output.
+ * Int: Zero if successful, -ENONEM otherwise.
+ */
+static int suspend_compress_allocate_local_buffer(void)
+{
+ if (!local_buffer) {
+ local_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+
+ if (!local_buffer) {
+ printk(KERN_ERR
+ "Failed to allocate the local buffer for "
+ "suspend2 compression driver.\n");
+ return -ENOMEM;
+ }
+ }
+
+ if (!page_buffer) {
+ page_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+
+ if (!page_buffer) {
+ printk(KERN_ERR
+ "Failed to allocate the page buffer for "
+ "suspend2 compression driver.\n");
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * suspend_compress_free_local_buffer
+ *
+ * Frees memory allocated for buffering output.
+ */
+static inline void suspend_compress_free_local_buffer(void)
+{
+ if (local_buffer)
+ free_page((unsigned long) local_buffer);
+
+ local_buffer = NULL;
+
+ if (page_buffer)
+ free_page((unsigned long) page_buffer);
+
+ page_buffer = NULL;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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