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| author | Jiri Slaby <jslaby@suse.cz> | 2021-05-05 12:19:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-13 17:57:16 +0300 |
| commit | 64d608db38ffc0c7a25455387096e0aad9410397 (patch) | |
| tree | 356a8ff491e272f0d497c9da4401c7f0827c425d /drivers/net/caif/caif_serial.c | |
| parent | 6e94dbc7a4e49a028b81302d755bba1a518f973b (diff) | |
| download | linux-64d608db38ffc0c7a25455387096e0aad9410397.tar.xz | |
tty: cumulate and document tty_struct::ctrl* members
Group the ctrl members under a single struct called ctrl. The new struct
contains 'pgrp', 'session', 'pktstatus', and 'packet'. 'pktstatus' and
'packet' used to be bits in a bitfield. The struct also contains the
lock protecting them to share the same cache line.
Note that commit c545b66c6922b (tty: Serialize tcflow() with other tty
flow control changes) added a padding to the original bitfield. It was
for the bitfield to occupy a whole 64b word to avoid interferring stores
on Alpha (cannot we evaporate this arch with weird implications to C
code yet?). But it doesn't work as expected as the padding
(tty_struct::ctrl_unused) is aligned to a 8B boundary too and occupies
some bytes from the next word.
So make it reliable by:
1) setting __aligned of the struct -- that aligns the start, and
2) making 'unsigned long unused[0]' as the last member of the struct --
pads the end.
Add a kerneldoc comment for this grouped members.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
Link: https://lore.kernel.org/r/20210505091928.22010-14-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/caif/caif_serial.c')
| -rw-r--r-- | drivers/net/caif/caif_serial.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c index 3996cf7dc9ba..b0566588ce33 100644 --- a/drivers/net/caif/caif_serial.c +++ b/drivers/net/caif/caif_serial.c @@ -89,7 +89,7 @@ static inline void update_tty_status(struct ser_device *ser) ser->tty_status = ser->tty->flow.stopped << 5 | ser->tty->flow.tco_stopped << 3 | - ser->tty->packet << 2; + ser->tty->ctrl.packet << 2; } static inline void debugfs_init(struct ser_device *ser, struct tty_struct *tty) { |