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b=PH4+1cFmqZ/jJP7uMNmA5XJANrv6IfwGkL1odjcuxuUkQH9mSNFKVFN0GFtw+IZzG wUxxpTxKqddekHhX1oGIfA0PqGMsDz/HIRRQf7DVPy8ESy1k9Tsb+5c0D6deWnCtTh /fNTtBtldbwUQ+3KIYsoJOV9AHo7mILOA29PwyD2GM2MyZVMDv/4vF38bqBfJCe6i8 UtI9kLeHLKePSFRKLB21jcvoItIYLKWGXQWvWISsGJtrJiLNxtyYGwWZcGT77xJIhW NDl/3azjt90J7Gaiw22jkjmdLyDZunupBZMIeQLkb12D3L6DV6T5XfGA1HsFRDbimY RSq5bunYFIMyg== Date: Wed, 14 Jan 2026 09:18:56 +0200 From: Mike Rapoport To: Robin Murphy Cc: m.szyprowski@samsung.com, akpm@linux-foundation.org, vbabka@suse.cz, david@kernel.org, bhe@redhat.com, iommu@lists.linux-foundation.org, linux-mm@kvack.org, vladimir.kondratiev@mobileye.com, s-adivi@ti.com, linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com Subject: Re: [PATCH 2/3] mm_zone: Generalise has_managed_dma() Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 4034EC0004 X-Stat-Signature: o5ux7nkz4dbkf8paurwagysrb56etqbz X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1768375147-485831 X-HE-Meta: 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 aQRlQ5TF M8F8iYueJuI90YiD3W0ctTC3zX49hIytrXGxo13Nptt3hEDRKoifwUkZBVd3Ctp/oSZDnkPlGZFpCLSyfgrYF8bgpLrcDhqB6Kn0z4P+wyA30hFkgYW405DgX8U3FDPQK3nOOH68aOI3cbo7MRBLWXTSC8nt0YVvFBYKQdKgCK8p4qgFXdJ6I3jvbGUqV9QAJ9o3Pm4TxUJkBjWCSo0eCT5wwjTy8zzRtYp+3cBsWYyAq1dMNnOp12oUdr0FYjGBCVLpsTPpFY6w6a03cUdA0/uECscFQnk+W0HHwem2QkmGLamKCjchkM3jJshJVf4udooHb5OLemr9lyVU3o4FzwejhKMWJ/NSSzC5BykK3ONArvZWAPFwQm1mwx9dZ9G4mpnSD X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jan 12, 2026 at 03:46:37PM +0000, Robin Murphy wrote: > It would be useful to be able to check for potential DMA pages beyond > just ZONE_DMA - generalise the existing has_managed_dma() function to > allow checking other zones too. > > Signed-off-by: Robin Murphy Acked-by: Mike Rapoport (Microsoft) > --- > include/linux/mmzone.h | 9 +++++---- > mm/page_alloc.c | 8 ++------ > 2 files changed, 7 insertions(+), 10 deletions(-) > > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h > index 75ef7c9f9307..fc5d6c88d2f0 100644 > --- a/include/linux/mmzone.h > +++ b/include/linux/mmzone.h > @@ -1648,14 +1648,15 @@ static inline int is_highmem(const struct zone *zone) > return is_highmem_idx(zone_idx(zone)); > } > > -#ifdef CONFIG_ZONE_DMA > -bool has_managed_dma(void); > -#else > +bool has_managed_zone(enum zone_type zone); > static inline bool has_managed_dma(void) > { > +#ifdef CONFIG_ZONE_DMA > + return has_managed_zone(ZONE_DMA); > +#else > return false; > -} > #endif > +} > > > #ifndef CONFIG_NUMA > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 822e05f1a964..36ccc85c5073 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -7418,20 +7418,16 @@ bool put_page_back_buddy(struct page *page) > } > #endif > > -#ifdef CONFIG_ZONE_DMA > -bool has_managed_dma(void) > +bool has_managed_zone(enum zone_type zone) > { > struct pglist_data *pgdat; > > for_each_online_pgdat(pgdat) { > - struct zone *zone = &pgdat->node_zones[ZONE_DMA]; > - > - if (managed_zone(zone)) > + if (managed_zone(&pgdat->node_zones[zone])) > return true; > } > return false; > } > -#endif /* CONFIG_ZONE_DMA */ > > #ifdef CONFIG_UNACCEPTED_MEMORY > > -- > 2.34.1 > -- Sincerely yours, Mike.