From: John Ogness Date: Tue, 26 Sep 2023 13:31:00 +0000 Subject: [PATCH 39/46] proc: Add nbcon support for /proc/consoles Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.9/older/patches-6.9-rt5.tar.xz Update /proc/consoles output to show 'W' if an nbcon write callback is implemented (write_atomic or write_thread). Also update /proc/consoles output to show 'N' if it is an nbcon console. Signed-off-by: John Ogness Signed-off-by: Sebastian Andrzej Siewior --- fs/proc/consoles.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) --- a/fs/proc/consoles.c +++ b/fs/proc/consoles.c @@ -21,12 +21,14 @@ static int show_console_dev(struct seq_f { CON_ENABLED, 'E' }, { CON_CONSDEV, 'C' }, { CON_BOOT, 'B' }, + { CON_NBCON, 'N' }, { CON_PRINTBUFFER, 'p' }, { CON_BRL, 'b' }, { CON_ANYTIME, 'a' }, }; char flags[ARRAY_SIZE(con_flags) + 1]; struct console *con = v; + char con_write = '-'; unsigned int a; dev_t dev = 0; @@ -57,9 +59,15 @@ static int show_console_dev(struct seq_f seq_setwidth(m, 21 - 1); seq_printf(m, "%s%d", con->name, con->index); seq_pad(m, ' '); - seq_printf(m, "%c%c%c (%s)", con->read ? 'R' : '-', - con->write ? 'W' : '-', con->unblank ? 'U' : '-', - flags); + if (con->flags & CON_NBCON) { + if (con->write_atomic || con->write_thread) + con_write = 'W'; + } else { + if (con->write) + con_write = 'W'; + } + seq_printf(m, "%c%c%c (%s)", con->read ? 'R' : '-', con_write, + con->unblank ? 'U' : '-', flags); if (dev) seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));