Re: PREEMPT_RT vs bcache

From: Kent Overstreet
Date: Wed Aug 07 2013 - 16:54:03 EST

On Wed, Aug 07, 2013 at 10:28:18PM +0200, Ben Hutchings wrote:
> As Kent said back in 2011 (commit 84759c6d18c5), bcache needs
> {down,up}_read_non_owner(). But these are not implemented by the -rt
> patchset when PREEMPT_RT_FULL is enabled. Can they be added, or is
> there a fundamental conflict here?

You should be able to cherry pick
84759c6d18c5144432781ddca037d929ee9db8a5 (Revert "rw_semaphore: remove
up/down_read_non_owner") - that went in when bcache was merged.
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