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bh=Ng3VAXsO0+uKTJvgr5A1gsaFED761TFqqXZSUjldDYY=; b=qaJCPy3Iy55i0637rqnxKBa95ledazP1wBFoXbJdYvl7NJ7B7HTBNZaUMQell4vogHkatX ycYoSycrZzlNIsitB/zfV1MSzacQIEP+UpeAl2ZG25HAPqsnZAOoJ4Ub6D/w5sbEv9PIf9 2aU6KfRnSjyoLNI3HS6aQZjOyks1voE= X-Rspamd-Server: rspam05 X-Rspam-User: Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2022-7-12 header.b=JNxyD+xj; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=S9kXRnii; spf=pass (imf26.hostedemail.com: domain of eric.devolder@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=eric.devolder@oracle.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); dmarc=pass (policy=none) header.from=oracle.com X-Stat-Signature: 1wwp3fkppo6uk41xz9m4tnwowwp3395a X-Rspamd-Queue-Id: 176D1140031 X-HE-Tag: 1665591690-817507 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: On 9/30/22 12:40, Borislav Petkov wrote: > On Fri, Sep 30, 2022 at 12:11:26PM -0500, Eric DeVolder wrote: >> There is of course a way to enumerate the memory regions in use on the >> machine, that is not what this code needs. In order to compute the maximum >> buffer size needed (this buffer size is computed once), the count of the >> maximum number of memory regions possible (even if not currently in use) is >> what is needed. > > Isn't that max number documented somewhere in memory hotplug docs? > > Because then you don't need that Kconfig item either. Imagine you're a > distro kernel distributor and you want crash to work on all machines > your kernel works. > > So you go and set that number to max. And that would be the 99% of the > kernel configs out there. > > Which means, you can just set it to max without a Kconfig item. > >> Oh, that would be an error of haste on my part. This should be: >> depends on CRASH_DUMP && MEMORY_HOTPLUG > > You need a Kconfig item which enables all this gunk as MEMORY_HOTPLUG is > not a omnipresent feature. And that Kconfig item should depend on the > other Kconfig items of the technology you need. I once had CONFIG_CRASH_HOTPLUG, but you disagreed. https://lore.kernel.org/lkml/Ylgot+LUDQl+G%2F5N@zn.tnic/ From there I simply went with #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_MEMORY_HOTPLUG) which route do you prefer? Thanks! eric > >> Baoquan pointed me to: >> >> https://lore.kernel.org/lkml/cover.1656659357.git.naveen.n.rao@linux.vnet.ibm.com/T/ > > In that thread says: > > "- arch_kexec_apply_relocations_add() is only overridden by x86 and s390. > Retain the function prototype for those and move the weak > implementation into the header as a static inline for other > architectures." > > So yes, that's even better. >