From: Baoquan He <bhe@redhat.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
akpm@linux-foundation.org, ignat@cloudflare.com,
linux-next@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org, kexec@lists.infradead.org,
eric_devolder@yahoo.com
Subject: Re: Re: linux-next: Tree for Dec 1 (riscv, crash_core)
Date: Mon, 4 Dec 2023 10:10:04 +0800 [thread overview]
Message-ID: <ZW00/Cfk47Cc3kGo@MiWiFi-R3L-srv> (raw)
eric_devolder@yahoo.com, ignat@cloudflare.com,
Linux Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
kexec <kexec@lists.infradead.org>
Bcc: bhe@redhat.com
Subject: Re: linux-next: Tree for Dec 1 (riscv, crash_core)
Reply-To:
In-Reply-To: <bbd1bbfb-c482-433d-bce9-2b591b8e855e@infradead.org>
On 12/01/23 at 11:53am, Randy Dunlap wrote:
>
>
> On 11/30/23 18:37, Stephen Rothwell wrote:
> > Hi all,
> >
> > Changes since 20231130:
> >
>
> on riscv 32-bit or 64-bit, with
> # CONFIG_MMU is not set
Thanks for providing the kernel config to ease reproduction. In the config,
there are:
CONFIG_CRASH_CORE=y
CONFIG_KEXEC_CORE=y
CONFIG_CRASH_DUMP=y
......
# CONFIG_MMU is not set
After investigation, I found this happened after Ignat's patch:
commit 1c7a3fa49ef7 ("kexec: drop dependency on ARCH_SUPPORTS_KEXEC from CRASH_DUMP")
Copy above commit change here for reference, and also risc-v's
ARCH_SUPPORTS_KEXEC depends on MMU:
--------------------------------------------------------
diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index fc38f1ae3a30..946dffa048b7 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -96,7 +96,6 @@ config KEXEC_JUMP
config CRASH_DUMP
bool "kernel crash dumps"
depends on ARCH_SUPPORTS_CRASH_DUMP
- depends on ARCH_SUPPORTS_KEXEC
select CRASH_CORE
select KEXEC_CORE
help
arch/riscv/Kconfig
---------------------
config ARCH_SUPPORTS_KEXEC
def_bool MMU
Before Ignat's patch, once CONFIG_MMU is unset, CONFIG_CRASH_DUMP,
CONFIG_KEXEC_CORE, CONFIG_CRASH_CORE are all unset automatically. The
crash_core codes are not compiled. That's why no compiling error is
seen.
After Ignat's patch applied, we can enable CONFIG_CRASH_DUMP,
CONFIG_KEXEC_CORE, CONFIG_CRASH_CORE independently. However, there are
several macro definitions, such as VA_BITS, VMEMMAP_START, VMEMMAP_END,
MODULES_VADDR, MODULES_END are only available when CONFIG_MMU=y.
I made two patches to decouple the kexec/crash code with CONFIG_MMU. Not
sure if risc-v wants that.
Or we can simply add dependency on MMU for ARCH_SUPPORTS_CRASH_DUMP.
Then when CONFIG_MMU=n, CONFIG_CRASH_DUMP, CONFIG_KEXEC_CORE,
CONFIG_CRASH_CORE will be unset too. Please help check which one need be
taken.
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 24c1799e2ec4..03d290da7262 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -708,6 +708,7 @@ config ARCH_SUPPORTS_KEXEC_PURGATORY
config ARCH_SUPPORTS_CRASH_DUMP
def_bool y
+ depends on MMU=y
config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
def_bool CRASH_CORE
>
> In file included from ../arch/riscv/kernel/crash_core.c:3:
> ../arch/riscv/kernel/crash_core.c: In function 'arch_crash_save_vmcoreinfo':
> ../arch/riscv/kernel/crash_core.c:8:27: error: 'VA_BITS' undeclared (first use in this function)
> 8 | VMCOREINFO_NUMBER(VA_BITS);
> | ^~~~~~~
> ../include/linux/crash_core.h:78:64: note: in definition of macro 'VMCOREINFO_NUMBER'
> 78 | vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
> | ^~~~
> ../arch/riscv/kernel/crash_core.c:8:27: note: each undeclared identifier is reported only once for each function it appears in
> 8 | VMCOREINFO_NUMBER(VA_BITS);
> | ^~~~~~~
> ../include/linux/crash_core.h:78:64: note: in definition of macro 'VMCOREINFO_NUMBER'
> 78 | vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
> | ^~~~
> ../arch/riscv/kernel/crash_core.c:12:58: warning: format '%lx' expects argument of type 'long unsigned int', but argument 2 has type 'int' [-Wformat=]
> 12 | vmcoreinfo_append_str("NUMBER(VMALLOC_START)=0x%lx\n", VMALLOC_START);
> | ~~^
> | |
> | long unsigned int
> | %x
> ../arch/riscv/kernel/crash_core.c:14:64: error: 'VMEMMAP_START' undeclared (first use in this function)
> 14 | vmcoreinfo_append_str("NUMBER(VMEMMAP_START)=0x%lx\n", VMEMMAP_START);
> | ^~~~~~~~~~~~~
> ../arch/riscv/kernel/crash_core.c:15:62: error: 'VMEMMAP_END' undeclared (first use in this function); did you mean 'MEMREMAP_ENC'?
> 15 | vmcoreinfo_append_str("NUMBER(VMEMMAP_END)=0x%lx\n", VMEMMAP_END);
> | ^~~~~~~~~~~
> | MEMREMAP_ENC
>
> 64-bit only:
>
> ../arch/riscv/kernel/crash_core.c:17:64: error: 'MODULES_VADDR' undeclared (first use in this function)
> 17 | vmcoreinfo_append_str("NUMBER(MODULES_VADDR)=0x%lx\n", MODULES_VADDR);
> | ^~~~~~~~~~~~~
> ../arch/riscv/kernel/crash_core.c:18:62: error: 'MODULES_END' undeclared (first use in this function)
> 18 | vmcoreinfo_append_str("NUMBER(MODULES_END)=0x%lx\n", MODULES_END);
> | ^~~~~~~~~~~
>
>
>
> --
> ~Randy
>
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
next reply other threads:[~2023-12-04 2:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-04 2:10 Baoquan He [this message]
2023-12-04 2:19 ` [PATCH 1/2] riscv, crash: don't export some symbols when CONFIG_MMU=n Baoquan He
2023-12-04 19:14 ` Randy Dunlap
2023-12-05 7:18 ` Baoquan He
2023-12-05 17:08 ` Randy Dunlap
2024-01-20 21:09 ` patchwork-bot+linux-riscv
2023-12-04 2:23 ` [PATCH 2/2] riscv, kexec: fix dependency of two items Baoquan He
2023-12-04 19:14 ` Randy Dunlap
2023-12-04 19:11 ` linux-next: Tree for Dec 1 (riscv, crash_core) Randy Dunlap
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=ZW00/Cfk47Cc3kGo@MiWiFi-R3L-srv \
--to=bhe@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=eric_devolder@yahoo.com \
--cc=ignat@cloudflare.com \
--cc=kexec@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-next@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=rdunlap@infradead.org \
--cc=sfr@canb.auug.org.au \
/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 read-only IMAP folder(s) and NNTP newsgroup(s).