From: Christoph Hellwig <hch@lst.de>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Christoph Hellwig <hch@lst.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>, Will Deacon <will@kernel.org>,
Marc Zyngier <maz@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Ard Biesheuvel <ardb@kernel.org>,
Isaac Manjarres <isaacmanjarres@google.com>,
Saravana Kannan <saravanak@google.com>,
linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 2/2] treewide: Add the __GFP_PACKED flag to several non-DMA kmalloc() allocations
Date: Sun, 30 Oct 2022 10:13:49 +0100 [thread overview]
Message-ID: <20221030091349.GA5600@lst.de> (raw)
In-Reply-To: <Y149vRuRPJnKqIFz@kroah.com>
On Sun, Oct 30, 2022 at 10:02:53AM +0100, Greg Kroah-Hartman wrote:
> Ah, my fault, sorry, you are right. Is there a sparse tag that just
> means "enforce this void * type?" I guess we could do that with something
> like:
> typedef void *dmaptr;
>
> but that feels icky.
That's because it is :) I find the concept of the DMA pointes pretty
strange to be honest. It only affects a subset of dma (when devices
are not attached in a DMA coherent way). So count me in as someone
who would be much more happy about figuring out a way to simplify
bounce buffer for non-coherent DMA if the start and length are not
aligned to the cache line size over any kind of special annotation
all over the kernel.
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next prev parent reply other threads:[~2022-10-30 9:14 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-25 20:52 [PATCH v2 0/2] mm: Allow kmalloc() allocations below ARCH_KMALLOC_MINALIGN Catalin Marinas
2022-10-25 20:52 ` [PATCH v2 1/2] mm: slab: Introduce __GFP_PACKED for smaller kmalloc() alignments Catalin Marinas
2022-10-26 6:39 ` Greg Kroah-Hartman
2022-10-26 8:39 ` Catalin Marinas
2022-10-26 9:49 ` Greg Kroah-Hartman
2022-10-26 9:58 ` Catalin Marinas
2022-10-27 12:11 ` Hyeonggon Yoo
2022-10-28 7:32 ` Catalin Marinas
2022-10-25 20:52 ` [PATCH v2 2/2] treewide: Add the __GFP_PACKED flag to several non-DMA kmalloc() allocations Catalin Marinas
2022-10-26 6:50 ` Greg Kroah-Hartman
2022-10-26 9:48 ` Catalin Marinas
2022-10-26 12:59 ` Greg Kroah-Hartman
2022-10-26 17:09 ` Catalin Marinas
2022-10-26 17:21 ` Greg Kroah-Hartman
2022-10-26 17:46 ` Linus Torvalds
2022-10-27 22:29 ` Catalin Marinas
2022-10-28 9:37 ` Greg Kroah-Hartman
2022-10-28 9:37 ` Greg Kroah-Hartman
2022-10-30 8:47 ` Christoph Hellwig
2022-10-30 9:02 ` Greg Kroah-Hartman
2022-10-30 9:13 ` Christoph Hellwig [this message]
2022-10-30 16:43 ` Catalin Marinas
2022-11-01 10:59 ` Christoph Hellwig
2022-11-01 17:19 ` Catalin Marinas
2022-11-01 17:24 ` Christoph Hellwig
2022-11-01 17:32 ` Catalin Marinas
2022-11-01 17:39 ` Christoph Hellwig
2022-11-01 19:10 ` Isaac Manjarres
2022-11-02 11:05 ` Catalin Marinas
2022-11-02 20:50 ` Isaac Manjarres
2022-11-01 18:14 ` Robin Murphy
2022-11-02 13:10 ` Catalin Marinas
2022-10-30 8:46 ` Christoph Hellwig
2022-10-30 8:44 ` Christoph Hellwig
2022-11-03 16:15 ` Vlastimil Babka
2022-11-03 18:03 ` Catalin Marinas
2022-10-26 6:54 ` [PATCH v2 0/2] mm: Allow kmalloc() allocations below ARCH_KMALLOC_MINALIGN Greg Kroah-Hartman
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