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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4ae99573cbesm67000691cf.30.2025.07.30.07.10.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Jul 2025 07:10:10 -0700 (PDT) Message-ID: <72485de0-d05e-4421-9b47-3449778d278b@redhat.com> Date: Wed, 30 Jul 2025 16:10:07 +0200 Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC][PATCH v2 16/29] mm/show_mem: Annotate static information into 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> <20250724135512.518487-17-eugen.hristev@linaro.org> <7ecaae9e-a088-4c1b-9caf-6a006a756544@redhat.com> <9843578b-2adb-4f6f-b3c1-99dac003e2bf@linaro.org> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 30.07.25 16:04, Eugen Hristev wrote: > > > On 7/30/25 16:55, David Hildenbrand wrote: >> On 24.07.25 15:54, Eugen Hristev wrote: >>> Annotate vital static information into kmemdump: >>> - _totalram_pages >>> >>> Information on these variables is stored into dedicated kmemdump section. >>> >>> Signed-off-by: Eugen Hristev >>> --- >>> mm/show_mem.c | 2 ++ >>> 1 file changed, 2 insertions(+) >>> >>> diff --git a/mm/show_mem.c b/mm/show_mem.c >>> index 41999e94a56d..93a5dc041ae1 100644 >>> --- a/mm/show_mem.c >>> +++ b/mm/show_mem.c >>> @@ -14,12 +14,14 @@ >>> #include >>> #include >>> #include >>> +#include >>> >>> #include "internal.h" >>> #include "swap.h" >>> >>> atomic_long_t _totalram_pages __read_mostly; >>> EXPORT_SYMBOL(_totalram_pages); >>> +KMEMDUMP_VAR_CORE(_totalram_pages, sizeof(_totalram_pages)); >> >> Tagging these variables that way is really rather ... controversial. >> >> As these are exported globals, isn't there a way to have a list of what >> to include and what not somewhere else? >> >> Not sure if any of that would win a beauty price, though. >> > > Annotating the variable was suggested here : > > https://lore.kernel.org/lkml/87h61wn2qq.ffs@tglx/ > > It does not win a beauty prize but it's simple and efficient at least. > Do you think it would be better to gather all the annotations for the > globals in a single place ? See my other mail regarding VMCOREINFO. -- Cheers, David / dhildenb