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Date: Wed, 1 Jul 2020 15:46:59 +0800 From: Dave Young <dyoung@...hat.com> To: Hari Bathini <hbathini@...ux.ibm.com> Cc: Petr Tesarik <ptesarik@...e.cz>, Thiago Jung Bauermann <bauerman@...ux.ibm.com>, Pingfan Liu <piliu@...hat.com>, Kexec-ml <kexec@...ts.infradead.org>, Mahesh J Salgaonkar <mahesh@...ux.ibm.com>, Mimi Zohar <zohar@...ux.ibm.com>, lkml <linux-kernel@...r.kernel.org>, linuxppc-dev <linuxppc-dev@...abs.org>, Sourabh Jain <sourabhjain@...ux.ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Vivek Goyal <vgoyal@...hat.com>, Eric Biederman <ebiederm@...ssion.com> Subject: Re: [PATCH 01/11] kexec_file: allow archs to handle special regions while locating memory hole On 06/29/20 at 05:26pm, Hari Bathini wrote: > Hi Petr, > > On 29/06/20 5:09 pm, Petr Tesarik wrote: > > Hi Hari, > > > > is there any good reason to add two more functions with a very similar > > name to an existing function? AFAICS all you need is a way to call a > > PPC64-specific function from within kexec_add_buffer (PATCH 4/11), so > > you could add something like this: > > > > int __weak arch_kexec_locate_mem_hole(struct kexec_buf *kbuf) > > { > > return 0; > > } > > > > Call this function from kexec_add_buffer where appropriate and then > > override it for PPC64 (it roughly corresponds to your > > kexec_locate_mem_hole_ppc64() from PATCH 4/11). > > > > FWIW it would make it easier for me to follow the resulting code. > > Right, Petr. > > I was trying out a few things before I ended up with what I sent here. > Bu yeah.. I did realize arch_kexec_locate_mem_hole() would have been better > after sending out v1. Will take care of that in v2. Another way is use arch private function to locate mem hole, then set kbuf->mem, and then call kexec_add_buf, it will skip the common locate hole function. But other than that I have some confusion about those excluded ranges. Replied a question to patch 4. Thanks Dave
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