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Commit dc8c8587 authored by Kay Sievers's avatar Kay Sievers Committed by Greg Kroah-Hartman
Browse files

PTY: add kernel parameter to overwrite legacy pty count 



Signed-off-by: default avatarKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 45aaae9c

Documentation/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -1430,6 +1430,10 @@ and is between 256 and 4096 characters. It is defined in the file 
	pt.		[PARIDE]

			See Documentation/paride.txt.



	pty.legacy_count=

			[KNL] Number of legacy pty's. Overwrites compiled-in

			default number.



	quiet		[KNL] Disable most log messages



	r128=		[HW,DRM]

drivers/char/pty.c

+7 −2
Original line number Diff line number Diff line
@@ -248,14 +248,19 @@ static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file, 
	return -ENOIOCTLCMD;

}



static int legacy_count = CONFIG_LEGACY_PTY_COUNT;

module_param(legacy_count, int, 0);



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)

		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)

		panic("Couldn't allocate pty slave driver");

include/linux/tty.h

+0 −1
Original line number Diff line number Diff line
@@ -21,7 +21,6 @@ 
 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are

 * 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_MAX	(1 << MINORBITS) /* Absolute limit */

#define NR_LDISCS		17