From: Vivek Goyal <vgoyal@redhat.com>
To: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
Jan Willeke <willeke@de.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
linux-kernel@vger.kernel.org, kexec@lists.infradead.org
Subject: Re: [PATCH v5 4/5] s390/vmcore: Implement remap_oldmem_pfn_range for s390
Date: Fri, 14 Jun 2013 16:08:08 -0400 [thread overview]
Message-ID: <20130614200808.GO12023@redhat.com> (raw)
In-Reply-To: <1370624161-2298-5-git-send-email-holzheu@linux.vnet.ibm.com>
On Fri, Jun 07, 2013 at 06:56:00PM +0200, Michael Holzheu wrote:
> From: Jan Willeke <willeke@de.ibm.com>
>
> This patch introduces the s390 specific way to map pages from oldmem.
> The memory area below OLDMEM_SIZE is mapped with offset OLDMEM_BASE.
> The other old memory is mapped directly.
>
If we get rid of swap logic in copy_oldmem_page(), quite some amount
of code can be cleaned up. One has to spcial case only zfcpdump to
read from HSA memory.
Anyway sounds like a s390 specific cleanup in a separate series.
Thanks
Vivek
> Signed-off-by: Jan Willeke <willeke@de.ibm.com>
> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
> ---
> arch/s390/kernel/crash_dump.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
> index a17f8d4..12ccc3c 100644
> --- a/arch/s390/kernel/crash_dump.c
> +++ b/arch/s390/kernel/crash_dump.c
> @@ -56,6 +56,32 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
> }
>
> /*
> + * Remap "oldmem"
> + *
> + * For the kdump reserved memory this functions performs a swap operation:
> + * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]
> + */
> +int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from,
> + unsigned long pfn, unsigned long size, pgprot_t prot)
> +{
> + unsigned long size_old;
> + int rc;
> +
> + if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) {
> + size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT));
> + rc = remap_pfn_range(vma, from,
> + pfn + (OLDMEM_BASE >> PAGE_SHIFT),
> + size_old, prot);
> + if (rc || size == size_old)
> + return rc;
> + size -= size_old;
> + from += size_old;
> + pfn += size_old >> PAGE_SHIFT;
> + }
> + return remap_pfn_range(vma, from, pfn, size, prot);
> +}
> +
> +/*
> * Copy memory from old kernel
> */
> int copy_from_oldmem(void *dest, void *src, size_t count)
> --
> 1.8.1.6
next prev parent reply other threads:[~2013-06-14 20:08 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-07 16:55 [PATCH v5 0/5] kdump: Allow ELF header creation in new kernel Michael Holzheu
2013-06-07 16:55 ` [PATCH v5 1/5] vmcore: Introduce ELF header in new memory feature Michael Holzheu
2013-06-10 13:35 ` HATAYAMA Daisuke
2013-06-10 13:53 ` Michael Holzheu
2013-06-14 18:54 ` Vivek Goyal
2013-06-21 14:17 ` Michael Holzheu
2013-06-27 19:32 ` Vivek Goyal
2013-06-27 20:10 ` Cliff Wickman
2013-06-27 20:23 ` Vivek Goyal
2013-06-28 8:15 ` Michael Holzheu
2013-07-01 17:37 ` Vivek Goyal
2013-07-01 18:29 ` Michael Holzheu
2013-06-07 16:55 ` [PATCH v5 2/5] s390/vmcore: Use " Michael Holzheu
2013-06-10 13:36 ` HATAYAMA Daisuke
2013-06-10 13:48 ` Michael Holzheu
2013-06-14 19:16 ` Vivek Goyal
2013-06-07 16:55 ` [PATCH v5 3/5] vmcore: Introduce remap_oldmem_pfn_range() Michael Holzheu
[not found] ` <CAJGZr0+_W0dp2f9VtVAiUT2fqiwe91gHXd9zYzfMMzBZSZogww@mail.gmail.com>
2013-06-10 8:00 ` Michael Holzheu
2013-06-10 13:40 ` HATAYAMA Daisuke
2013-06-10 14:03 ` Michael Holzheu
2013-06-10 15:37 ` Michael Holzheu
2013-06-11 12:42 ` HATAYAMA Daisuke
2013-06-12 9:13 ` Michael Holzheu
2013-06-13 1:32 ` HATAYAMA Daisuke
2013-06-13 8:54 ` Michael Holzheu
2013-06-13 4:00 ` HATAYAMA Daisuke
2013-06-11 13:20 ` HATAYAMA Daisuke
2013-06-07 16:56 ` [PATCH v5 4/5] s390/vmcore: Implement remap_oldmem_pfn_range for s390 Michael Holzheu
2013-06-14 20:08 ` Vivek Goyal [this message]
2013-06-07 16:56 ` [PATCH v5 5/5] s390/vmcore: Use vmcore for zfcpdump Michael Holzheu
2013-06-11 23:47 ` HATAYAMA Daisuke
2013-06-12 9:14 ` Michael Holzheu
2013-06-14 18:54 ` [PATCH v5 0/5] kdump: Allow ELF header creation in new kernel Vivek Goyal
2013-06-21 13:39 ` Michael Holzheu
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