Re: OpenGL-based framebuffer concepts

[Andrew Morton]

"Antonino A. Daplas" <adaplas@xxxxxxxxx> wrote:
>
> Console writes are done with the console semaphore held. printk will also
> just write to the log buffer and defer the actual console printing
> for later, by the next or current process that will grab the semaphore.

Always by the current process which holds console_sem.  Leaving the printing
for the next process would be unacceptably too late for printk.

If printk sees that someone holds console_sem, printk will leave the data
in the log buffer for the current holder of console_sem to print, prior to
that caller releasing console_sem.  logbuf_log is used in tricky ways
around console_sem to prevent races in this logic.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/