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[2a02:3100:b2e6:5301:2072:420:f831:ed4e]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-489bd7b1df0sm1001928f8f.31.2026.09.27.11.35.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Sep 2026 11:35:18 -0700 (PDT) Date: Sun, 27 Sep 2026 20:35:16 +0200 From: Karl Mehltretter To: John Paul Adrian Glaubitz Cc: Yoshinori Sato , Rich Felker , linux-sh@vger.kernel.org, Muchun Song , Oscar Salvador , David Hildenbrand , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/2] sh: mm: fix hugetlb on SH-4 Message-ID: References: <20260926183904.76186-1-kmehltretter@gmail.com> <9b75aa51e19f9c0f5c97ac02cfc0948ab5bbf279.camel@physik.fu-berlin.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9b75aa51e19f9c0f5c97ac02cfc0948ab5bbf279.camel@physik.fu-berlin.de> X-Stat-Signature: ynd54pnmkhattip9jhcsoyzi3cfb9qjg X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 89074180003 X-HE-Tag: 1790534120-390826 X-HE-Meta: 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 75wVoH0i 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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 Sat, Sep 26, 2026 at 08:43:45PM +0100, John Paul Adrian Glaubitz wrote: > Thanks for the patch! This should definitely be tested on real hardware > and I think it's a good reason to test this on my SH7785LCR which wouldn't > boot on anything newer than 6.5.0. > Hi Adrian, Testing with real hardware is very cool! Maybe I will get some SH hardware myself one day. For now you've motivated me to do a QEMU SuperH fork with more features, with a lot of help from my LLM agent: https://github.com/kmehltretter82/qemu-superh I will send some bug fix patches based on it soon, hopefully also fixing your 6.5 problem. I believe it is an old heap overflow in the SH intc code that only started to crash when sh7785lcr_defconfig switched from SLAB to SLUB in 6.5. Karl