From: James Morse <james.morse@arm.com>
To: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: catalin.marinas@arm.com, will.deacon@arm.com,
dhowells@redhat.com, vgoyal@redhat.com,
herbert@gondor.apana.org.au, davem@davemloft.net,
dyoung@redhat.com, bhe@redhat.com, arnd@arndb.de,
ard.biesheuvel@linaro.org, bhsharma@redhat.com,
kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH v10 03/14] powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem()
Date: Mon, 9 Jul 2018 12:03:13 +0100 [thread overview]
Message-ID: <68e7d558-91bf-a6f4-3e59-b93d5db0d77b@arm.com> (raw)
In-Reply-To: <20180709054953.GR28220@linaro.org>
Hi Akashi,
On 09/07/18 06:49, AKASHI Takahiro wrote:
> On Tue, Jul 03, 2018 at 05:36:24PM +0100, James Morse wrote:
>> On 23/06/18 03:20, AKASHI Takahiro wrote:
>>> Memblock list is another source for usable system memory layout.
>>> A merged new arch_kexec_walk_mem() will walk through either io resource
>>> list or memblock list depending on CONFIG_ARCH_DISCARD_MEMBLOCK so that
>>> arm64, in addition to powerpc, will be able to utilize this generic
>>> function for kexec_file.
>>
>>> diff --git a/arch/powerpc/kernel/machine_kexec_file_64.c b/arch/powerpc/kernel/machine_kexec_file_64.c
>>> index 0bd23dc789a4..3d4be91786ce 100644
>>> --- a/arch/powerpc/kernel/machine_kexec_file_64.c
>>> +++ b/arch/powerpc/kernel/machine_kexec_file_64.c
>>> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
>>> index 63c7ce1c0c3e..563acd1c9a61 100644
>>> --- a/kernel/kexec_file.c
>>> +++ b/kernel/kexec_file.c
>>> @@ -16,6 +16,7 @@
>>> #include <linux/file.h>
>>> #include <linux/slab.h>
>>> #include <linux/kexec.h>
>>> +#include <linux/memblock.h>
>>> #include <linux/mutex.h>
>>> #include <linux/list.h>
>>> #include <linux/fs.h>
>>> @@ -501,6 +502,53 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
>>> return locate_mem_hole_bottom_up(start, end, kbuf);
>>> }
>>>
>>> +#if defined(CONFIG_HAVE_MEMBLOCK) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
>>
>> The only caller is also guarded by these same ifdefs. Can't we remove this and
>> rely on the compilers dead-code elimination to remove this function when its not
>> needed?
>
> I don't think we can remove this #ifdef.
> "for_each_free_mem_range[_reverse]()" is defined under CONFIG_HAVE_MEMBLOCK
> in memblock.h. If some architecture wants to support KEXEC_FILE but
> doesn't have HAVE_MEMBLOCK, compiling kexec_file.c will fail.
Ah, I'd missed this, turns out memblock isn't ubiquitous!
Thanks,
James
next prev parent reply other threads:[~2018-07-09 11:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-23 2:20 [PATCH v10 00/14] arm64: kexec: add kexec_file_load() support AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 01/14] asm-generic: add kexec_file_load system call to unistd.h AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 02/14] kexec_file: make kexec_image_post_load_cleanup_default() global AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 03/14] powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem() AKASHI Takahiro
2018-07-03 16:36 ` James Morse
2018-07-09 5:49 ` AKASHI Takahiro
2018-07-09 11:03 ` James Morse [this message]
2018-06-23 2:20 ` [PATCH v10 04/14] of/fdt: add helper functions for handling properties AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 05/14] arm64: add image head flag definitions AKASHI Takahiro
2018-07-03 16:34 ` James Morse
2018-06-23 2:20 ` [PATCH v10 06/14] arm64: cpufeature: add MMFR0 helper functions AKASHI Takahiro
2018-07-03 16:33 ` James Morse
2018-06-23 2:20 ` [PATCH v10 07/14] arm64: enable KEXEC_FILE config AKASHI Takahiro
2018-07-03 16:33 ` James Morse
2018-07-09 6:31 ` AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 08/14] arm64: kexec_file: load initrd and device-tree AKASHI Takahiro
2018-07-03 16:32 ` James Morse
2018-07-10 7:37 ` AKASHI Takahiro
2018-07-10 15:25 ` James Morse
2018-07-11 2:49 ` AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 09/14] arm64: kexec_file: allow for loading Image-format kernel AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 10/14] arm64: kexec_file: add crash dump support AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 11/14] arm64: kexec_file: invoke the kernel without purgatory AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 12/14] include: pe.h: remove message[] from mz header definition AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 13/14] arm64: kexec_file: add kernel signature verification support AKASHI Takahiro
2018-07-03 17:47 ` James Morse
2018-07-09 9:01 ` AKASHI Takahiro
2018-06-23 2:20 ` [PATCH v10 14/14] arm64: kexec_file: add kaslr support AKASHI Takahiro
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=68e7d558-91bf-a6f4-3e59-b93d5db0d77b@arm.com \
--to=james.morse@arm.com \
--cc=ard.biesheuvel@linaro.org \
--cc=arnd@arndb.de \
--cc=bhe@redhat.com \
--cc=bhsharma@redhat.com \
--cc=catalin.marinas@arm.com \
--cc=davem@davemloft.net \
--cc=dhowells@redhat.com \
--cc=dyoung@redhat.com \
--cc=ebiederm@xmission.com \
--cc=herbert@gondor.apana.org.au \
--cc=kexec@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=takahiro.akashi@linaro.org \
--cc=vgoyal@redhat.com \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).