Re: [PATCH v11 07/16] sched: Split the guts of sched_setaffinity() into a helper function
flat view
From: Will Deacon <will@kernel.org>
Date: 2021-08-18 10:50:48
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On Tue, Aug 17, 2021 at 05:40:24PM +0200, Peter Zijlstra wrote:
On Fri, Jul 30, 2021 at 12:24:34PM +0100, Will Deacon wrote:quoted
In preparation for replaying user affinity requests using a saved mask, split sched_setaffinity() up so that the initial task lookup and security checks are only performed when the request is coming directly from userspace. Reviewed-by: Valentin Schneider <redacted> Signed-off-by: Will Deacon <will@kernel.org>Should not sched_setaffinity() update user_cpus_ptr when it isn't NULL, such that the upcoming relax_compatible_cpus_allowed_ptr() preserve the full user mask?
The idea is that force_compatible_cpus_allowed_ptr() and relax_compatible_cpus_allowed_ptr() are used as a pair, with the former setting ->user_cpus_ptr and the latter restoring it. An intervening call to sched_setaffinity() must _clear_ the saved mask, as we discussed before at: https://lore.kernel.org/r/YK53kDtczHIYumDC@hirez.programming.kicks-ass.net (local) Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel