linux-kernel - Re: [PATCH v3 33/57] perf: Simplify perf_adjust_freq_unthr

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Message-ID: <20230612200525.GO4253@hirez.programming.kicks-ass.net>
Date:   Mon, 12 Jun 2023 22:05:25 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
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Subject: Re: [PATCH v3 33/57] perf: Simplify perf_adjust_freq_unthr_context()

On Mon, Jun 12, 2023 at 11:55:57AM -0700, Linus Torvalds wrote:

> So while it might not be the horrible bug I thought it was, I'd
> _really_ like us to not do those things just from a sanity angle.

OK, let me go see if there's another way to sanely write those.


Is this less offensive?

restart:
	scoped_guard (rcu) {
		list_for_each_entry_rcu(..) {
			...
			if (err == -EAGAIN)
				goto restart;
		}
	}


That has the explicit scope on the rcu and now the goto explicitly exist
it.

Gonna have to think what to do about the continue ...