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definitions=main-2311070192 X-Proofpoint-ORIG-GUID: JVpdLMC8mrAG9Ya5YWdYjaOycNaFJHpv X-Proofpoint-GUID: JVpdLMC8mrAG9Ya5YWdYjaOycNaFJHpv X-Rspam-User: X-Stat-Signature: 3x4f6ys64669xzgyxp1ifr4z3tmxcntf X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 6450F40010 X-HE-Tag: 1699399416-341833 X-HE-Meta: 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 Mtcu60iD 5FkFTkaSf6s5p+IYBn1wJ9mAXBVBVBcAdOyg5s7chiK1zYvtV4Odw6XVN/r0tPVLyVw6IYO9LaMe8/7J+Q1upSElyrLU56yong03fLmfAgsTc8lvQVr1xrJbsQ22GB8D8ENxKeUqfXs0zx9mMQ5O5jGeTMA7CSyQPQK9JOjT9gdoB3dWi/CF44IICpLWw/RSwTB+iriapYrouVByP+LRUg7PziKswHyg+XLhGfFwF9Ty5+Qtfh3dRAmMasiznU1LUy75FzWPSfAalzYzlhGP1xaGN7p8Za0BY0cSbWWLkQzvGINFWdZhFJhC7/lC7i5ojkgk12aXFj6NQnOj7Y7Hs6BJKu9Dr1IEVWHq5As0vUlNhOr7ZlNXFRg2aKQ2sIvZaRQViBOy+2XUMmkK3yCGjhAzDUUx+mJtFemcRkOM0enTXKK4+lSaG6GuIdw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Steven Rostedt writes: > On Tue, 7 Nov 2023 13:56:49 -0800 > Ankur Arora wrote: > >> This reverts commit 089c02ae2771a14af2928c59c56abfb9b885a8d7. > > I rather not revert this. > > If user space can decided between various version of preemption, then the > trace should reflect that. At least state what the preemption model was when > a trace started, or currently is. > Oh absolutely. As I mention in the cover at least these three patches would be back: 089c02ae2771 ("ftrace: Use preemption model accessors for trace header printout") cfe43f478b79 ("preempt/dynamic: Introduce preemption model accessors") 5693fa74f98a ("kcsan: Use preemption model accessors") The intent was (which I didn't do for the RFC), to do the reverts as cleanly as possible, do the changes for the series and then bring these patches back with appropriate modifications. > That is, the model may not be "static" per boot. Anyway, the real change here should be: Yeah, I intended to do something like that. Or would you prefer these not be reverted (and reapplied) at all -- just fixed as you describe here? > Then this way we can decided to make it runtime dynamic, we don't need to > fiddle with the tracing code again. Yeah, that makes sense. -- ankur