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b=oYSebltYV0b0EJR6dW6OS1C59FdwWEL0aUqpQwzm8jHn5lsb+YABFdEMCOFcq4tSF A6BBaOi5a70XQuE0vh2VSgN67Ws99/tI4izKQOq60CU0LxmibeeHwfDUX3ocow81iX JItqbbJPgGOcVoRDMN2rFfZS1hkdPG1mcylnjKvRMOwdhrfhdmFbHhNwBDvoKDlyAh zNDe766gk3gCO5CqFQvroV7drCSpwxPcBOl99JwWyB3G0iW79yNh16RS7JPfOR9cHL 4kAwDDy/koHfBtThWk8F23shMRn8rk2YOOvPbGjGiKZ17kQ1ksmSy+VOIvPjGzvNtE YyOfny1iDh0Fw== Message-ID: Date: Mon, 13 Apr 2026 17:12:07 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/8] mm/memory: add memory_block_align_range() helper To: Gregory Price , linux-mm@kvack.org, vishal.l.verma@intel.com, dave.jiang@intel.com, akpm@linux-foundation.org, osalvador@suse.de Cc: dan.j.williams@intel.com, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, kernel-team@meta.com References: <20260321150404.3288786-1-gourry@gourry.net> <20260321150404.3288786-3-gourry@gourry.net> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 07E06C0007 X-Stat-Signature: jegihc6isfb8po17ztxxyftnm55zwts3 X-Rspamd-Server: rspam06 X-HE-Tag: 1776093135-805038 X-HE-Meta: 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 GxlPlUZN TWlmG3BYsuGdyX4Lv5hIJC3z1JGCFc71CMKkirOVcWv7gxo3yiaht01WCBKe7hdsB/sIEf5Bt+/PM6KdZHYojUirtuqntvP9toEr/rsTYPdAEB/w8itLiubcmFetJRCslu16dtifYDPoAOXgcvZtZ53nBDhnJ9P8dE27OrVOSi2X44/lM0/fMQHEfxukQn06v+2AoajhT2x0GRHfQIV5qGo+hp5HZ6THPrPXF5U5f6FLeywNSXXCJf3NOkXgKqyQQ9Udv1rIU/rtMuHoIMaKrdmq/ql/0VpHwR22QY8C/W8ygKi8LXSonm/qaq6QE33rOZLzIvC1TsMXDEktBUDk+TG8uPgA5fNUWrALsE9YKolYNLvM= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/21/26 16:03, Gregory Price wrote: > Memory hotplug operations require ranges aligned to memory block > boundaries. This is a generic operation for hotplug. > > Add memory_block_align_range() as a common helper in > that aligns the start address up and end address down to memory block > boundaries. > > Update dax/kmem to use this helper. > > Signed-off-by: Gregory Price > --- > drivers/dax/kmem.c | 4 +--- > include/linux/memory.h | 22 ++++++++++++++++++++++ > 2 files changed, 23 insertions(+), 3 deletions(-) > > diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c > index eb693a581961..798f389df992 100644 > --- a/drivers/dax/kmem.c > +++ b/drivers/dax/kmem.c > @@ -26,9 +26,7 @@ static int dax_kmem_range(struct dev_dax *dev_dax, int i, struct range *r) > struct dev_dax_range *dax_range = &dev_dax->ranges[i]; > struct range *range = &dax_range->range; > > - /* memory-block align the hotplug range */ > - r->start = ALIGN(range->start, memory_block_size_bytes()); > - r->end = ALIGN_DOWN(range->end + 1, memory_block_size_bytes()) - 1; > + *r = memory_block_align_range(range); > if (r->start >= r->end) { > r->start = range->start; > r->end = range->end; > diff --git a/include/linux/memory.h b/include/linux/memory.h > index 5bb5599c6b2b..17cdf6ba3823 100644 > --- a/include/linux/memory.h > +++ b/include/linux/memory.h > @@ -20,6 +20,7 @@ > #include > #include > #include > +#include > > #define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS) > > @@ -100,6 +101,27 @@ int arch_get_memory_phys_device(unsigned long start_pfn); > unsigned long memory_block_size_bytes(void); > int set_memory_block_size_order(unsigned int order); > > +/** > + * memory_block_align_range - align a physical address range to memory blocks > + * @range: the input range to align > + * > + * Aligns the start address up and the end address down to memory block > + * boundaries. This is required for memory hotplug operations which must > + * operate on memory-block aligned ranges. > + * > + * Returns the aligned range. Callers should check that the returned > + * range is valid (aligned.start < aligned.end) before using it. > + */ > +static inline struct range memory_block_align_range(const struct range *range) Reads as if you would be passing in a memory block. Maybe "align_range_to_memory_blocks()" "range_align_to_memory_blocks()" Maybe what also works: "memory_block_aligned_range()" In general, LGTM. -- Cheers, David