linux-kernel - Re: [PATCH] s390/crash: Fix KEXEC_NOTE

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Message-Id: <20170621110031.76c15516@TP-holzheu>
Date:   Wed, 21 Jun 2017 11:00:31 +0200
From:   Michael Holzheu <holzheu@...ux.vnet.ibm.com>
To:     Xunlei Pang <xlpang@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        akpm@...ux-foundation.org, Eric Biederman <ebiederm@...ssion.com>,
        Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>,
        linux-s390@...r.kernel.org, Dave Anderson <anderson@...hat.com>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        Gustavo Luiz Duarte <gustavold@...ux.vnet.ibm.com>,
        Mikhail Zaslonko <zaslonko@...ux.vnet.ibm.com>
Subject: Re: [PATCH] s390/crash: Fix KEXEC_NOTE_BYTES definition

Hi Xunlei,

Sorry for the late reply - I was on vacation up to now.
Give us some time to look into this issue.

Michael

Am Fri,  9 Jun 2017 10:17:05 +0800
schrieb Xunlei Pang <xlpang@...hat.com>:

> S390 KEXEC_NOTE_BYTES is not used by note_buf_t as before, which
> is now defined as follows:
>     typedef u32 note_buf_t[CRASH_CORE_NOTE_BYTES/4];
> It was changed by the CONFIG_CRASH_CORE feature.
> 
> This patch gets rid of all the old KEXEC_NOTE_BYTES stuff, and
> renames KEXEC_NOTE_BYTES to CRASH_CORE_NOTE_BYTES for S390.
> 
> Fixes: 692f66f26a4c ("crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE")
> Cc: Dave Young <dyoung@...hat.com>
> Cc: Dave Anderson <anderson@...hat.com>
> Cc: Hari Bathini <hbathini@...ux.vnet.ibm.com>
> Cc: Gustavo Luiz Duarte <gustavold@...ux.vnet.ibm.com>
> Signed-off-by: Xunlei Pang <xlpang@...hat.com>
> ---
>  arch/s390/include/asm/kexec.h |  2 +-
>  include/linux/crash_core.h    |  7 +++++++
>  include/linux/kexec.h         | 11 +----------
>  3 files changed, 9 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/s390/include/asm/kexec.h b/arch/s390/include/asm/kexec.h
> index 2f924bc..352deb8 100644
> --- a/arch/s390/include/asm/kexec.h
> +++ b/arch/s390/include/asm/kexec.h
> @@ -47,7 +47,7 @@
>   * Seven notes plus zero note at the end: prstatus, fpregset, timer,
>   * tod_cmp, tod_reg, control regs, and prefix
>   */
> -#define KEXEC_NOTE_BYTES \
> +#define CRASH_CORE_NOTE_BYTES \
>  	(ALIGN(sizeof(struct elf_note), 4) * 8 + \
>  	 ALIGN(sizeof("CORE"), 4) * 7 + \
>  	 ALIGN(sizeof(struct elf_prstatus), 4) + \
> diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
> index e9de6b4..dbc6e5c 100644
> --- a/include/linux/crash_core.h
> +++ b/include/linux/crash_core.h
> @@ -10,9 +10,16 @@
>  #define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(CRASH_CORE_NOTE_NAME), 4)
>  #define CRASH_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
> 
> +/*
> + * The per-cpu notes area is a list of notes terminated by a "NULL"
> + * note header.  For kdump, the code in vmcore.c runs in the context
> + * of the second kernel to combine them into one note.
> + */
> +#ifndef CRASH_CORE_NOTE_BYTES
>  #define CRASH_CORE_NOTE_BYTES	   ((CRASH_CORE_NOTE_HEAD_BYTES * 2) +	\
>  				     CRASH_CORE_NOTE_NAME_BYTES +	\
>  				     CRASH_CORE_NOTE_DESC_BYTES)
> +#endif
> 
>  #define VMCOREINFO_BYTES	   PAGE_SIZE
>  #define VMCOREINFO_NOTE_NAME	   "VMCOREINFO"
> diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> index 3ea8275..133df03 100644
> --- a/include/linux/kexec.h
> +++ b/include/linux/kexec.h
> @@ -14,7 +14,6 @@
> 
>  #if !defined(__ASSEMBLY__)
> 
> -#include <linux/crash_core.h>
>  #include <asm/io.h>
> 
>  #include <uapi/linux/kexec.h>
> @@ -25,6 +24,7 @@
>  #include <linux/ioport.h>
>  #include <linux/module.h>
>  #include <asm/kexec.h>
> +#include <linux/crash_core.h>
> 
>  /* Verify architecture specific macros are defined */
> 
> @@ -63,15 +63,6 @@
>  #define KEXEC_CORE_NOTE_NAME	CRASH_CORE_NOTE_NAME
> 
>  /*
> - * The per-cpu notes area is a list of notes terminated by a "NULL"
> - * note header.  For kdump, the code in vmcore.c runs in the context
> - * of the second kernel to combine them into one note.
> - */
> -#ifndef KEXEC_NOTE_BYTES
> -#define KEXEC_NOTE_BYTES	CRASH_CORE_NOTE_BYTES
> -#endif
> -
> -/*
>   * This structure is used to hold the arguments that are used when loading
>   * kernel binaries.
>   */