From: Jason Gunthorpe <jgg@ziepe.ca>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Muchun Song <muchun.song@linux.dev>,
Oscar Salvador <osalvador@suse.de>,
David Hildenbrand <david@redhat.com>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Axel Rasmussen <axelrasmussen@google.com>,
Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
Peter Xu <peterx@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
Kees Cook <kees@kernel.org>, Matthew Wilcox <willy@infradead.org>,
John Hubbard <jhubbard@nvidia.com>,
Leon Romanovsky <leon@kernel.org>, Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Nico Pache <npache@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Xu Xin <xu.xin16@zte.com.cn>,
Chengming Zhou <chengming.zhou@linux.dev>,
Jann Horn <jannh@google.com>,
Matthew Brost <matthew.brost@intel.com>,
Joshua Hahn <joshua.hahnjy@gmail.com>,
Rakie Kim <rakie.kim@sk.com>, Byungchul Park <byungchul@sk.com>,
Gregory Price <gourry@gourry.net>,
Ying Huang <ying.huang@linux.alibaba.com>,
Alistair Popple <apopple@nvidia.com>,
Pedro Falcato <pfalcato@suse.de>,
Shakeel Butt <shakeel.butt@linux.dev>,
David Rientjes <rientjes@google.com>,
Rik van Riel <riel@surriel.com>, Harry Yoo <harry.yoo@oracle.com>,
Kemeng Shi <shikemeng@huaweicloud.com>,
Kairui Song <kasong@tencent.com>, Nhat Pham <nphamcs@gmail.com>,
Baoquan He <bhe@redhat.com>, Chris Li <chrisl@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Qi Zheng <zhengqi.arch@bytedance.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 4/4] mm: introduce and use VMA flag test helpers
Date: Thu, 30 Oct 2025 14:54:21 -0300 [thread overview]
Message-ID: <20251030175421.GC1204670@ziepe.ca> (raw)
In-Reply-To: <a7161d7d-7445-4015-8821-b32c469d6eaf@lucifer.local>
On Thu, Oct 30, 2025 at 02:03:02PM +0000, Lorenzo Stoakes wrote:
> Yeah, OK well your point has been made here, the compiler _is_ smart enough
> to save us here :)
>
> Let's avoid this first word stuff altogether then.
I suggest to add some helpers to the general include/linux/bitmap.h
"subsystem" that lets it help do this:
#define BITMAP_OR_BITS(type, member, bit1, bit2, bit3)
returns a type with the bitmap array member initialized to those bits
Then some other bitmap helpers that are doing the specific maths you
want..
* bitmap_and_eq(src1, src2, src3, nbits) true if *src1 & *src2 == *src3
* bitmap_and_eq_zero(src1, src2, nbits) true if *src1 & *src1 == 0
etc
Jason
next prev parent reply other threads:[~2025-10-30 17:54 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-29 17:49 [PATCH 0/4] initial work on making VMA flags a bitmap Lorenzo Stoakes
2025-10-29 17:49 ` [PATCH 1/4] mm: declare VMA flags by bit Lorenzo Stoakes
2025-10-29 19:02 ` Jason Gunthorpe
2025-10-30 9:07 ` Lorenzo Stoakes
2025-10-30 12:55 ` Jason Gunthorpe
2025-10-30 13:45 ` Lorenzo Stoakes
2025-10-31 13:58 ` Gregory Price
2025-10-29 17:49 ` [PATCH 2/4] mm: simplify and rename mm flags function for clarity Lorenzo Stoakes
2025-10-29 17:49 ` [PATCH 3/4] mm: introduce VMA flags bitmap type Lorenzo Stoakes
2025-10-29 17:49 ` [PATCH 4/4] mm: introduce and use VMA flag test helpers Lorenzo Stoakes
2025-10-29 19:22 ` Jason Gunthorpe
2025-10-30 10:04 ` Lorenzo Stoakes
2025-10-30 12:52 ` Jason Gunthorpe
2025-10-30 14:03 ` Lorenzo Stoakes
2025-10-30 17:54 ` Jason Gunthorpe [this message]
2025-10-30 19:21 ` Lorenzo Stoakes
2025-10-30 3:07 ` [PATCH 0/4] initial work on making VMA flags a bitmap Nico Pache
2025-10-30 8:33 ` Lorenzo Stoakes
2025-10-30 9:20 ` Nico Pache
2025-10-30 9:22 ` Nico Pache
2025-10-30 11:43 ` Alice Ryhl
2025-10-30 12:02 ` Lorenzo Stoakes
2025-10-30 13:38 ` Alice Ryhl
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20251030175421.GC1204670@ziepe.ca \
--to=jgg@ziepe.ca \
--cc=Liam.Howlett@oracle.com \
--cc=akpm@linux-foundation.org \
--cc=apopple@nvidia.com \
--cc=axelrasmussen@google.com \
--cc=baohua@kernel.org \
--cc=baolin.wang@linux.alibaba.com \
--cc=bhe@redhat.com \
--cc=bsegall@google.com \
--cc=byungchul@sk.com \
--cc=chengming.zhou@linux.dev \
--cc=chrisl@kernel.org \
--cc=david@redhat.com \
--cc=dev.jain@arm.com \
--cc=dietmar.eggemann@arm.com \
--cc=gourry@gourry.net \
--cc=hannes@cmpxchg.org \
--cc=harry.yoo@oracle.com \
--cc=jannh@google.com \
--cc=jhubbard@nvidia.com \
--cc=joshua.hahnjy@gmail.com \
--cc=juri.lelli@redhat.com \
--cc=kasong@tencent.com \
--cc=kees@kernel.org \
--cc=lance.yang@linux.dev \
--cc=leon@kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lorenzo.stoakes@oracle.com \
--cc=matthew.brost@intel.com \
--cc=mgorman@suse.de \
--cc=mhocko@suse.com \
--cc=mingo@redhat.com \
--cc=muchun.song@linux.dev \
--cc=npache@redhat.com \
--cc=nphamcs@gmail.com \
--cc=osalvador@suse.de \
--cc=peterx@redhat.com \
--cc=peterz@infradead.org \
--cc=pfalcato@suse.de \
--cc=rakie.kim@sk.com \
--cc=riel@surriel.com \
--cc=rientjes@google.com \
--cc=rostedt@goodmis.org \
--cc=rppt@kernel.org \
--cc=ryan.roberts@arm.com \
--cc=shakeel.butt@linux.dev \
--cc=shikemeng@huaweicloud.com \
--cc=surenb@google.com \
--cc=vbabka@suse.cz \
--cc=vincent.guittot@linaro.org \
--cc=vschneid@redhat.com \
--cc=weixugc@google.com \
--cc=willy@infradead.org \
--cc=xu.xin16@zte.com.cn \
--cc=ying.huang@linux.alibaba.com \
--cc=yuanchu@google.com \
--cc=zhengqi.arch@bytedance.com \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).