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Received: from [50.53.25.54] (helo=[192.168.254.17]) by bombadil.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1ufVhr-0000000B5Pk-0JWR; Sat, 26 Jul 2025 03:36:19 +0000 Message-ID: <0fa9e4e7-1247-4c82-8c0b-fa65b7fbb56d@infradead.org> Date: Fri, 25 Jul 2025 20:36:18 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC][PATCH v2 01/29] kmemdump: introduce kmemdump To: Eugen Hristev , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, tglx@linutronix.de, andersson@kernel.org, pmladek@suse.com Cc: linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org, corbet@lwn.net, mojha@qti.qualcomm.com, rostedt@goodmis.org, jonechou@google.com, tudor.ambarus@linaro.org References: <20250724135512.518487-1-eugen.hristev@linaro.org> <20250724135512.518487-2-eugen.hristev@linaro.org> Content-Language: en-US From: Randy Dunlap In-Reply-To: <20250724135512.518487-2-eugen.hristev@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: zxgxua6iow3yw46pjgbe7erk4qdr5hte X-Rspamd-Queue-Id: 4423D1A0006 X-Rspamd-Server: rspam10 X-Rspam-User: X-HE-Tag: 1753500980-454520 X-HE-Meta: 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 l25MUPpc f32PD3eahCfQnmkl2Zr+3C9xYRpRaSRHspQgWdzTrGudb9EFMNAccIxhaXMqYhDyQJpILzNVuCDaL78OncFLxqlTSKCGphvsSO9a9qqM4+FNj86YPzYjuXmfvvFjZK46gB23gwdJA2LtTfeKkmSSEUmBPKPVdLwQesEDnnOtdxt3gr2MifH2/bJVC2pbvdbtm/Dz6qhIKUtM8OH561dgjS4hIzJhi9G/YLyCfRkKn2V8s63R+lTlqgenbj9AiuStv3sAG 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: Hi, On 7/24/25 6:54 AM, Eugen Hristev wrote: > diff --git a/drivers/debug/Kconfig b/drivers/debug/Kconfig > new file mode 100644 > index 000000000000..b86585c5d621 > --- /dev/null > +++ b/drivers/debug/Kconfig > @@ -0,0 +1,16 @@ > +# SPDX-License-Identifier: GPL-2.0 > +menu "Generic Debug Options" > + > +config KMEMDUMP > + bool "Allow the kernel to register memory regions for dumping purpose" > + help > + Kmemdump mechanism allows any driver to register a specific memory > + area for later dumping purpose, depending on the functionality > + of the attached backend. The backend would interface any hardware > + mechanism that will allow dumping to happen regardless of the > + state of the kernel (running, frozen, crashed, or any particular > + state). > + > + Note that modules using this feature must be rebuilt if option > + changes. It seems to me that this (all of the KMEMDUMP Kconfig options) could live in mm/Kconfig.debug instead of creating a new subdir for it. -- ~Randy