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Date: Thu, 07 May 2015 11:35:33 +0300 From: Boaz Harrosh <boaz@...xistor.com> To: Christoph Hellwig <hch@....de>, Ross Zwisler <ross.zwisler@...ux.intel.com> CC: linux-nvdimm@...1.01.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org, axboe@...nel.dk Subject: Re: [PATCH 1/3] pmem: Initial version of persistent memory driver On 05/07/2015 10:26 AM, Christoph Hellwig wrote: > On Mon, May 04, 2015 at 10:43:01AM -0600, Ross Zwisler wrote: >>> Yes, if CONFIG_DEBUG_BLOCK_EXT_DEVT isn't set that code doesn't work at all. >> >> I can't figure out a use case that breaks when using dynamically allocated >> minors without CONFIG_DEBUG_BLOCK_EXT_DEVT. The patch that I've been testing >> against is at the bottom of this mail. >> >> Here are the minors that I get when creating a bunch of partitions using the >> current code with PMEM_MINORS=16, with CONFIG_DEBUG_BLOCK_EXT_DEVT turned off: > > FYI, your patch below works fine for me, but the original one certainly > didn't. One big difference was that it also removed the register_blkdev > call and thus assigning a major number. > assigning a major number for what? That "assigned major number" is then never used *anywhere* in the code at all until it is unregistered. All the devices come up with the dynamic (259) major the register_blkdev is just dead code. I have experimented with this a lot, I have audited the all code stack, that major is never used, when doing the: alloc_disk(0) disk->flags |= GENHD_FL_EXT_DEVT The: disk->major = X Is completely ignored and is immediately over written. The only relic of that major registration is the pmem_major global member collecting dust. Sigh, bad habits die hard, I don't really care you can keep it. Sorry for the noise. Cheers Boaz -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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