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authorPeter Hurley <peter@hurleysoftware.com>2013-06-15 09:36:16 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-23 16:47:10 -0700
commit9114fe8ccf1871f630d2c14cd60e5f455b015459 (patch)
tree1549929e9dfe5faf7a43897f5901a6d005cb6bec /drivers/tty/tty_buffer.c
parenta7c8d58c79853adeebf0a1ddc9c63e433b4d97f1 (diff)
downloadlinux-9114fe8ccf1871f630d2c14cd60e5f455b015459.tar.bz2
tty: Remove private constant from global namespace
TTY_BUFFER_PAGE is only used within drivers/tty/tty_buffer.c; relocate to that file scope. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_buffer.c')
-rw-r--r--drivers/tty/tty_buffer.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index f22e116db105..c043136fbe51 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -28,6 +28,16 @@
*/
#define TTYB_MEM_LIMIT 65536
+/*
+ * We default to dicing tty buffer allocations to this many characters
+ * in order to avoid multiple page allocations. We know the size of
+ * tty_buffer itself but it must also be taken into account that the
+ * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
+ * logic this must match
+ */
+
+#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
+
/**
* tty_buffer_lock_exclusive - gain exclusive access to buffer