On Tue, Dec 30, 2014 at 08:07:40PM +0100, Peter Zijlstra wrote:

On Tue, Dec 30, 2014 at 01:54:07PM -0500, Pranith Kumar wrote:

quoted

On Tue, Dec 30, 2014 at 1:50 PM, Peter Zijlstra [off-list ref] wrote:

quoted

On Tue, Dec 30, 2014 at 12:46:22AM -0500, Pranith Kumar wrote:

quoted

Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
is a compile time failure if srcu is used when not enabled. This was decided to
be better than waiting until link time for a failure to occur.

Why?

This is part of the kernel tinification efforts. The first patch was
posted here: https://lkml.org/lkml/2014/12/4/848. This patch enables a
compile time failure instead of a link time failure.

can't be arsed to click. again, why does it matter when it fails,
neither stages produces a working kernel so tinification cannot be the
purpose.

In fairness, Pranith's original submission did force the failure at
link time.  One piece of feedback was to force the failure at compile
time (can't remember from who).  But given the hassles encountered with
compile-time failure, it might well be getting to the point where it is
time to fall back to the link-time-failure approach.

							Thanx, Paul