linux-kernel - Re: [RFC PATCH v1] devres: align devres.data strictly only for devm

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Message-ID: <20191220171906.GR2827@hirez.programming.kicks-ass.net>
Date:   Fri, 20 Dec 2019 18:19:06 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marc Gonzalez <marc.w.gonzalez@...e.fr>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Robin Murphy <robin.murphy@....com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Alexey Brodkin <alexey.brodkin@...opsys.com>,
        Will Deacon <will@...nel.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Tejun Heo <tj@...nel.org>, Mark Brown <broonie@...nel.org>
Subject: Re: [RFC PATCH v1] devres: align devres.data strictly only for
 devm_kmalloc()

On Fri, Dec 20, 2019 at 01:05:43PM +0100, Marc Gonzalez wrote:
> If "fixing" the kmalloc strict alignment requirement on arm64 is too
> hard, maybe it would be possible to shave some of the devm memory
> waste by working with (chained) arrays of devm nodes, instead
> of a straight-up linked list. (Akin to a C++ vector) Removal would
> be expensive, but that's supposed to be a rare operation, right?

xarray might be what you're looking for.