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FromArnd Bergmann <>
SubjectRe: [PATCH 04/14] vc: Locking clean up
DateFri, 30 Apr 2010 22:30:22 +0200
On Thursday 01 April 2010 18:04:59 Alan Cox wrote:
> @@ -282,7 +282,12 @@ static inline unsigned short *screenpos(struct vc_data *vc, int offset, int view
>
> static inline void scrolldelta(int lines)
> {
> + lock_kernel();
> + /* FIXME */
> + /* scrolldelta needs some kind of consistency lock, but the BKL was
> + and still is not protecting versus the scheduled back end */
> scrollback_delta += lines;
> + unlock_kernel();
> schedule_console_callback();
> }
>

This one triggered a might_sleep() warning in _lock_kernel(), because
it's called from the keyboard interrupt.

Arnd


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