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PTY: add kernel parameter to overwrite legacy pty count

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Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers 2007-08-15 12:25:38 +02:00 committed by Greg Kroah-Hartman
parent 45aaae9c51
commit dc8c85871c
3 changed files with 11 additions and 3 deletions
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4
Documentation/kernel-parameters.txt
View file

@ -1430,6 +1430,10 @@ and is between 256 and 4096 characters. It is defined in the file
pt. [PARIDE] pt. [PARIDE]
See Documentation/paride.txt. See Documentation/paride.txt.
pty.legacy_count=
[KNL] Number of legacy pty's. Overwrites compiled-in
default number.
quiet [KNL] Disable most log messages quiet [KNL] Disable most log messages
r128= [HW,DRM] r128= [HW,DRM]

9
drivers/char/pty.c
View file

@ -248,14 +248,19 @@ static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file,
return -ENOIOCTLCMD; return -ENOIOCTLCMD;
} }
static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
module_param(legacy_count, int, 0);
static void __init legacy_pty_init(void) static void __init legacy_pty_init(void)
{ {
if (legacy_count <= 0)
return;
pty_driver = alloc_tty_driver(NR_PTYS); pty_driver = alloc_tty_driver(legacy_count);
if (!pty_driver) if (!pty_driver)
panic("Couldn't allocate pty driver"); panic("Couldn't allocate pty driver");
pty_slave_driver = alloc_tty_driver(NR_PTYS); pty_slave_driver = alloc_tty_driver(legacy_count);
if (!pty_slave_driver) if (!pty_slave_driver)
panic("Couldn't allocate pty slave driver"); panic("Couldn't allocate pty slave driver");

1
include/linux/tty.h
View file

@ -21,7 +21,6 @@
* (Note: the *_driver.minor_start values 1, 64, 128, 192 are * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
* hardcoded at present.) * hardcoded at present.)
*/ */
#define NR_PTYS CONFIG_LEGACY_PTY_COUNT /* Number of legacy ptys */
#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */ #define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */ #define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
#define NR_LDISCS 17 #define NR_LDISCS 17