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[2a02:3100:b162:c701:4960:a998:3de8:2fce]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49fef60da94sm102924275e9.4.2026.09.26.09.19.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Sep 2026 09:19:56 -0700 (PDT) Date: Sat, 26 Sep 2026 18:19:54 +0200 From: Karl Mehltretter To: Muchun Song Cc: Russell King , linux-arm-kernel@lists.infradead.org, Oscar Salvador , Andrew Morton , David Hildenbrand , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ARM: mm: align hugetlb mappings to the huge page size Message-ID: References: <20260901085740.66283-1-kmehltretter@gmail.com> <5AB6FE85-4CB9-41EF-A700-BC5E071F29F5@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <5AB6FE85-4CB9-41EF-A700-BC5E071F29F5@linux.dev> X-Stat-Signature: xb5tqq5d5sy58agdesg9y9n5j8xnyx4y X-Rspamd-Queue-Id: 8E58CA000B X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1790439598-439847 X-HE-Meta: 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 rLI3qUrN 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Sep 24, 2026 at 04:41:30PM +0100, Muchun Song wrote: > > Fixes: 7bd3f1e1a9ae ("mm: make hugetlb mappings go through mm_get_unmapped_area_vmflags") > > Cc: stable@vger.kernel.org > > Assisted-by: LLM > > Signed-off-by: Karl Mehltretter > > Besides 32-bit Arm, the same regression appears to affect MIPS and > SuperH: both support HugeTLB and provide custom arch_get_unmapped_area*() > implementations that only enforce cache-colouring alignment, not the > hstate’s huge-page alignment. > > Acked-by: Muchun Song Hi Muchun, Thanks for the ack. I've now submitted the patch to Russell's patch tracker: https://www.armlinux.org.uk/developer/patches/viewpatch.php?id=9524/1 I'll also take a look at the MIPS and SuperH cases you mentioned. Karl