On Mon, Sep 19, 2016 at 12:06:57AM +0200, Manuel Schölling wrote: > Add a scrollback buffers for each VGA console. The benefit is that > the scrollback history is not flushed when switching between consoles > but is persistent. > The buffers are allocated on demand when a new console is opened. > > It always annoys me when I switch back to a console and I can just > read half of an error backtrace. This should fix issues like these. > > This breaks tools like clear_console that rely on flushing the > scrollback history by switching back and forth between consoles > which is why this feature is disabled by default. > Use the escape sequence \e[3J instead for flushing the buffer. > > Signed-off-by: Manuel Schölling <manuel.schoell...@gmx.de> > --- > Changes in v3: > - Add config option for this feature > - Fallback to old scrollback buffer if kcalloc() fails > - Remove ioctl() call again and add documentation about existing > escape sequence to flush the scrollback buffer > Changes in v2: > - Add ioctl() call to flush scrollback buffer > - (Patch v2 was not labeled as such, sorry) > --- > drivers/video/console/Kconfig | 23 +++++- > drivers/video/console/vgacon.c | 160 > +++++++++++++++++++++++++++-------------- > 2 files changed, 128 insertions(+), 55 deletions(-)
I need someone else to at least test this, and give an acked-by for it... thanks, greg k-h
