From: Michael Holzheu <holzheu@linux.vnet.ibm.com> To: Vivek Goyal <vgoyal@redhat.com>, HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> Cc: 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: [PATCH 0/2] kdump/mmap: Fix mmap of /proc/vmcore for s390 Date: Fri, 24 May 2013 15:08:07 +0200 [thread overview] Message-ID: <1369400889-11064-1-git-send-email-holzheu@linux.vnet.ibm.com> (raw) Hello Vivek and Hatayama, Currently the /proc/vmcore mmap patches are not working on s390. The problem is that on s390 the kernel in not relocatable and therefore always runs in the lower memory area. Therefore for kdump on s390 we swap the lower memory area with the crashkernel area before starting the kdump kernel: [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] To fix /proc/vmcore mmap memory below OLDMEMSIZE needs to be mapped with OLDMEM_BASE as offset. To achieve that, a new weak function arch_oldmem_remap_pfn_range() is introduced. If you agree with our approach, could you integrate the two patches into the mmap patch series? Best Regards, Michael --- Jan Willeke (2): kdump/mmap: Introduce arch_oldmem_remap_pfn_range() s390/kdump/mmap: Implement arch_oldmem_remap_pfn_range() for s390 arch/s390/kernel/crash_dump.c | 27 +++++++++++++++++++++++++++ fs/proc/vmcore.c | 15 ++++++++++++++- include/linux/crash_dump.h | 5 +++++ 3 files changed, 46 insertions(+), 1 deletion(-) -- 1.8.1.6
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From: Michael Holzheu <holzheu@linux.vnet.ibm.com> To: Vivek Goyal <vgoyal@redhat.com>, HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>, kexec@lists.infradead.org, Heiko Carstens <heiko.carstens@de.ibm.com>, Jan Willeke <willeke@de.ibm.com>, linux-kernel@vger.kernel.org Subject: [PATCH 0/2] kdump/mmap: Fix mmap of /proc/vmcore for s390 Date: Fri, 24 May 2013 15:08:07 +0200 [thread overview] Message-ID: <1369400889-11064-1-git-send-email-holzheu@linux.vnet.ibm.com> (raw) Hello Vivek and Hatayama, Currently the /proc/vmcore mmap patches are not working on s390. The problem is that on s390 the kernel in not relocatable and therefore always runs in the lower memory area. Therefore for kdump on s390 we swap the lower memory area with the crashkernel area before starting the kdump kernel: [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] To fix /proc/vmcore mmap memory below OLDMEMSIZE needs to be mapped with OLDMEM_BASE as offset. To achieve that, a new weak function arch_oldmem_remap_pfn_range() is introduced. If you agree with our approach, could you integrate the two patches into the mmap patch series? Best Regards, Michael --- Jan Willeke (2): kdump/mmap: Introduce arch_oldmem_remap_pfn_range() s390/kdump/mmap: Implement arch_oldmem_remap_pfn_range() for s390 arch/s390/kernel/crash_dump.c | 27 +++++++++++++++++++++++++++ fs/proc/vmcore.c | 15 ++++++++++++++- include/linux/crash_dump.h | 5 +++++ 3 files changed, 46 insertions(+), 1 deletion(-) -- 1.8.1.6 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next reply other threads:[~2013-05-24 13:08 UTC|newest] Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-05-24 13:08 Michael Holzheu [this message] 2013-05-24 13:08 ` [PATCH 0/2] kdump/mmap: Fix mmap of /proc/vmcore for s390 Michael Holzheu 2013-05-24 13:08 ` [PATCH 1/2] kdump/mmap: Introduce arch_oldmem_remap_pfn_range() Michael Holzheu 2013-05-24 13:08 ` Michael Holzheu 2013-05-24 13:08 ` [PATCH 2/2] s390/kdump/mmap: Implement arch_oldmem_remap_pfn_range() for s390 Michael Holzheu 2013-05-24 13:08 ` Michael Holzheu 2013-05-24 14:36 ` [PATCH 0/2] kdump/mmap: Fix mmap of /proc/vmcore " Vivek Goyal 2013-05-24 14:36 ` Vivek Goyal 2013-05-24 15:06 ` Michael Holzheu 2013-05-24 15:06 ` Michael Holzheu 2013-05-24 15:28 ` Vivek Goyal 2013-05-24 15:28 ` Vivek Goyal 2013-05-24 16:46 ` Michael Holzheu 2013-05-24 16:46 ` Michael Holzheu 2013-05-24 17:05 ` Vivek Goyal 2013-05-24 17:05 ` Vivek Goyal 2013-05-25 13:13 ` Michael Holzheu 2013-05-25 13:13 ` Michael Holzheu 2013-05-24 22:44 ` Eric W. Biederman 2013-05-24 22:44 ` Eric W. Biederman 2013-05-25 0:33 ` Zhang Yanfei 2013-05-25 0:33 ` Zhang Yanfei 2013-05-25 3:01 ` Eric W. Biederman 2013-05-25 3:01 ` Eric W. Biederman 2013-05-25 8:31 ` Zhang Yanfei 2013-05-25 8:31 ` Zhang Yanfei 2013-05-25 12:52 ` Michael Holzheu 2013-05-25 12:52 ` Michael Holzheu 2013-05-28 13:55 ` Vivek Goyal 2013-05-28 13:55 ` Vivek Goyal 2013-05-29 11:51 ` Michael Holzheu 2013-05-29 11:51 ` Michael Holzheu 2013-05-29 16:23 ` Vivek Goyal 2013-05-29 16:23 ` Vivek Goyal 2013-05-29 17:12 ` Michael Holzheu 2013-05-29 17:12 ` Michael Holzheu 2013-05-30 15:00 ` Vivek Goyal 2013-05-30 15:00 ` Vivek Goyal 2013-05-30 20:38 ` Vivek Goyal 2013-05-30 20:38 ` Vivek Goyal 2013-05-31 14:21 ` Michael Holzheu 2013-05-31 14:21 ` Michael Holzheu 2013-05-31 16:01 ` Vivek Goyal 2013-05-31 16:01 ` Vivek Goyal 2013-06-03 13:27 ` Michael Holzheu 2013-06-03 13:27 ` Michael Holzheu 2013-06-03 15:59 ` Vivek Goyal 2013-06-03 15:59 ` Vivek Goyal 2013-06-03 16:48 ` Michael Holzheu 2013-06-03 16:48 ` Michael Holzheu 2013-05-28 14:44 ` Vivek Goyal 2013-05-28 14:44 ` Vivek Goyal 2013-05-25 20:36 ` Eric W. Biederman 2013-05-25 20:36 ` Eric W. Biederman
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