| commit | d640f45411308c70e205d04938dfda94152738fb | |
| author | Mel Gorman <mel@csn.ul.ie> | |
| Tue, 2 Mar 2010 22:24:19 +0000 (2 22:24 +0000) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Thu, 1 Apr 2010 22:58:31 +0000 (1 15:58 -0700) | ||
| tree | d1ee2a3943ef00b6c454c45c70ad1b0da792468e | treesnapshot (tar.gz zip) |
| parent | d560f99c9aafb9ebe1911541cf30d909819564eb | commitdiff |
tty: Take a 256 byte padding into account when buffering below sub-page units
commit 352fa6ad16b89f8ffd1a93b4419b1a8f2259feab upstream.
The TTY layer takes some care to ensure that only sub-page allocations
are made with interrupts disabled. It does this by setting a goal of
"TTY_BUFFER_PAGE" to allocate. Unfortunately, while TTY_BUFFER_PAGE takes the
size of tty_buffer into account, it fails to account that tty_buffer_find()
rounds the buffer size out to the next 256 byte boundary before adding on
the size of the tty_buffer.
This patch adjusts the TTY_BUFFER_PAGE calculation to take into account the
size of the tty_buffer and the padding. Once applied, tty_buffer_alloc()
should not require high-order allocations.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit 352fa6ad16b89f8ffd1a93b4419b1a8f2259feab upstream.
The TTY layer takes some care to ensure that only sub-page allocations
are made with interrupts disabled. It does this by setting a goal of
"TTY_BUFFER_PAGE" to allocate. Unfortunately, while TTY_BUFFER_PAGE takes the
size of tty_buffer into account, it fails to account that tty_buffer_find()
rounds the buffer size out to the next 256 byte boundary before adding on
the size of the tty_buffer.
This patch adjusts the TTY_BUFFER_PAGE calculation to take into account the
size of the tty_buffer and the padding. Once applied, tty_buffer_alloc()
should not require high-order allocations.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| include/linux/tty.h | diffblobblamehistory |