* Re: [PATCH 1/2] drivers/base/node.c: split loop in register_mem_sect_under_node [not found] <1a7c81db42986a6fa27260fe189890bffc8a9cce.1440665740.git.jstancek@redhat.com> @ 2015-09-01 7:15 ` Dave Young [not found] ` <b12da2996a30cb739146a5eccd068bbe650092a1.1440665740.git.jstancek@redhat.com> 1 sibling, 0 replies; 6+ messages in thread From: Dave Young @ 2015-09-01 7:15 UTC (permalink / raw) To: Jan Stancek; +Cc: gregkh, linux-kernel, linux-mm Ccing linux-mm On 08/27/15 at 04:43pm, Jan Stancek wrote: > Split single loop going over all pfn in mem_blk into 2 loops, > where outer loop goes over all sections and inner loop goes over > pfn from that section. > > This is preparatory patch for next patch: > "skip non-present sections in register_mem_sect_under_node" > > Signed-off-by: Jan Stancek <jstancek@redhat.com> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > --- > drivers/base/node.c | 41 ++++++++++++++++++++++++----------------- > 1 file changed, 24 insertions(+), 17 deletions(-) > > diff --git a/drivers/base/node.c b/drivers/base/node.c > index 31df474d72f4..4c7423a4b5f4 100644 > --- a/drivers/base/node.c > +++ b/drivers/base/node.c > @@ -379,33 +379,40 @@ static int __init_refok get_nid_for_pfn(unsigned long pfn) > int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) > { > int ret; > - unsigned long pfn, sect_start_pfn, sect_end_pfn; > + unsigned long pfn, sect_start_pfn, sect_end_pfn, sect_no; > > if (!mem_blk) > return -EFAULT; > if (!node_online(nid)) > return 0; > > - sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); > - sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); > - sect_end_pfn += PAGES_PER_SECTION - 1; > - for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { > - int page_nid; > + for (sect_no = mem_blk->start_section_nr; > + sect_no <= mem_blk->end_section_nr; > + sect_no++) { > > - page_nid = get_nid_for_pfn(pfn); > - if (page_nid < 0) > - continue; > - if (page_nid != nid) > - continue; > - ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, > - &mem_blk->dev.kobj, > - kobject_name(&mem_blk->dev.kobj)); > - if (ret) > - return ret; > + sect_start_pfn = section_nr_to_pfn(sect_no); > + sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; > + > + for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { > + int page_nid; > > - return sysfs_create_link_nowarn(&mem_blk->dev.kobj, > + page_nid = get_nid_for_pfn(pfn); > + if (page_nid < 0) > + continue; > + if (page_nid != nid) > + continue; > + > + ret = sysfs_create_link_nowarn( > + &node_devices[nid]->dev.kobj, > + &mem_blk->dev.kobj, > + kobject_name(&mem_blk->dev.kobj)); > + if (ret) > + return ret; > + > + return sysfs_create_link_nowarn(&mem_blk->dev.kobj, > &node_devices[nid]->dev.kobj, > kobject_name(&node_devices[nid]->dev.kobj)); > + } > } > /* mem section does not span the specified node */ > return 0; > -- > 1.8.3.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 6+ messages in thread
[parent not found: <b12da2996a30cb739146a5eccd068bbe650092a1.1440665740.git.jstancek@redhat.com>]
* Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node [not found] ` <b12da2996a30cb739146a5eccd068bbe650092a1.1440665740.git.jstancek@redhat.com> @ 2015-09-01 7:15 ` Dave Young 2015-09-09 11:11 ` Jan Stancek 0 siblings, 1 reply; 6+ messages in thread From: Dave Young @ 2015-09-01 7:15 UTC (permalink / raw) To: Jan Stancek; +Cc: gregkh, linux-kernel, linux-mm On 08/27/15 at 04:43pm, Jan Stancek wrote: > Skip non-present sections in mem_blk to avoid crashing during boot > at register_mem_sect_under_node()->get_nid_for_pfn(): > > Unable to handle kernel paging request for data at address 0xf000000000080020 > Faulting instruction address: 0xc00000000866b480 > Oops: Kernel access of bad area, sig: 11 [#1] > SMP NR_CPUS=2048 NUMA pSeries > Modules linked in: > CPU: 14 PID: 1 Comm: swapper/14 Not tainted 4.2.0-rc8+ #6 > task: c00000001e480000 ti: c00000001e500000 task.ti: c00000001e500000 > NIP: c00000000866b480 LR: c00000000851aecc CTR: 0000000000000400 > ... > NIP [c00000000866b480] get_nid_for_pfn+0x10/0x30 > LR [c00000000851aecc] register_mem_sect_under_node+0x9c/0x190 > Call Trace: > [c00000001e503b10] [c0000000084f89a4] put_device+0x24/0x40 (unreliable) > [c00000001e503b60] [c00000000851b3d4] register_one_node+0x2b4/0x390 > [c00000001e503bc0] [c000000008ae7a50] topology_init+0x4c/0x1e8 > [c00000001e503c30] [c00000000800b3bc] do_one_initcall+0x10c/0x260 > [c00000001e503d00] [c000000008ae41b4] kernel_init_freeable+0x27c/0x364 > [c00000001e503dc0] [c00000000800bc14] kernel_init+0x24/0x130 > [c00000001e503e30] [c000000008009530] ret_from_kernel_thread+0x5c/0xac > Instruction dump: > 4e800020 60000000 60000000 60420000 3b80ffed 4bffffc8 00000000 00000000 > 3920ffff 78633664 792900c4 7d434a14 <e94a0020> 2faa0000 41de0010 7c63482a > ---[ end trace e9ab4a173e0cee14 ]--- > > This has been observed during kdump kernel boot on ppc64le KVM guest > (page size: 65536, sections_per_block: 16, PAGES_PER_SECTION: 256) > where kdump adds "rtas" to list of usable regions: > # hexdump -C /sys/firmware/devicetree/base/rtas/linux,rtas-base > 00000000 2f ff 00 00 |/...| > > [ 0.000000] Early memory node ranges > [ 0.000000] node 0: [mem 0x0000000000000000-0x000000001fffffff] > [ 0.000000] node 0: [mem 0x000000002fff0000-0x000000002fffffff] > > Crash happens when register_mem_sect_under_node goes over mem_blk that > spans sections 32-47, 32-46 are not present, 47 is present: > 32 * 256 * 65536 == 0x20000000 > 47 * 256 * 65536 == 0x2f000000 > It tries to access page for first pfn of this mem_blk (8192 == 32 * 256) > and crashes. > > Signed-off-by: Jan Stancek <jstancek@redhat.com> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > --- > drivers/base/node.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/base/node.c b/drivers/base/node.c > index 4c7423a4b5f4..e638cfde7486 100644 > --- a/drivers/base/node.c > +++ b/drivers/base/node.c > @@ -390,6 +390,9 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) > sect_no <= mem_blk->end_section_nr; > sect_no++) { > > + if (!present_section_nr(sect_no)) > + continue; > + > sect_start_pfn = section_nr_to_pfn(sect_no); > sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; > > -- > 1.8.3.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node 2015-09-01 7:15 ` [PATCH 2/2] drivers/base/node.c: skip non-present sections " Dave Young @ 2015-09-09 11:11 ` Jan Stancek 2015-09-22 8:27 ` Jan Stancek 0 siblings, 1 reply; 6+ messages in thread From: Jan Stancek @ 2015-09-09 11:11 UTC (permalink / raw) To: gregkh; +Cc: linux-kernel, linux-mm, Dave Young Greg, any thoughts about the patch? Regards, Jan ----- Original Message ----- > From: "Dave Young" <dyoung@redhat.com> > To: "Jan Stancek" <jstancek@redhat.com> > Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org > Sent: Tuesday, 1 September, 2015 9:15:53 AM > Subject: Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node > > On 08/27/15 at 04:43pm, Jan Stancek wrote: > > Skip non-present sections in mem_blk to avoid crashing during boot > > at register_mem_sect_under_node()->get_nid_for_pfn(): > > > > Unable to handle kernel paging request for data at address > > 0xf000000000080020 > > Faulting instruction address: 0xc00000000866b480 > > Oops: Kernel access of bad area, sig: 11 [#1] > > SMP NR_CPUS=2048 NUMA pSeries > > Modules linked in: > > CPU: 14 PID: 1 Comm: swapper/14 Not tainted 4.2.0-rc8+ #6 > > task: c00000001e480000 ti: c00000001e500000 task.ti: c00000001e500000 > > NIP: c00000000866b480 LR: c00000000851aecc CTR: 0000000000000400 > > ... > > NIP [c00000000866b480] get_nid_for_pfn+0x10/0x30 > > LR [c00000000851aecc] register_mem_sect_under_node+0x9c/0x190 > > Call Trace: > > [c00000001e503b10] [c0000000084f89a4] put_device+0x24/0x40 (unreliable) > > [c00000001e503b60] [c00000000851b3d4] register_one_node+0x2b4/0x390 > > [c00000001e503bc0] [c000000008ae7a50] topology_init+0x4c/0x1e8 > > [c00000001e503c30] [c00000000800b3bc] do_one_initcall+0x10c/0x260 > > [c00000001e503d00] [c000000008ae41b4] kernel_init_freeable+0x27c/0x364 > > [c00000001e503dc0] [c00000000800bc14] kernel_init+0x24/0x130 > > [c00000001e503e30] [c000000008009530] ret_from_kernel_thread+0x5c/0xac > > Instruction dump: > > 4e800020 60000000 60000000 60420000 3b80ffed 4bffffc8 00000000 00000000 > > 3920ffff 78633664 792900c4 7d434a14 <e94a0020> 2faa0000 41de0010 7c63482a > > ---[ end trace e9ab4a173e0cee14 ]--- > > > > This has been observed during kdump kernel boot on ppc64le KVM guest > > (page size: 65536, sections_per_block: 16, PAGES_PER_SECTION: 256) > > where kdump adds "rtas" to list of usable regions: > > # hexdump -C /sys/firmware/devicetree/base/rtas/linux,rtas-base > > 00000000 2f ff 00 00 |/...| > > > > [ 0.000000] Early memory node ranges > > [ 0.000000] node 0: [mem 0x0000000000000000-0x000000001fffffff] > > [ 0.000000] node 0: [mem 0x000000002fff0000-0x000000002fffffff] > > > > Crash happens when register_mem_sect_under_node goes over mem_blk that > > spans sections 32-47, 32-46 are not present, 47 is present: > > 32 * 256 * 65536 == 0x20000000 > > 47 * 256 * 65536 == 0x2f000000 > > It tries to access page for first pfn of this mem_blk (8192 == 32 * 256) > > and crashes. > > > > Signed-off-by: Jan Stancek <jstancek@redhat.com> > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > --- > > drivers/base/node.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/drivers/base/node.c b/drivers/base/node.c > > index 4c7423a4b5f4..e638cfde7486 100644 > > --- a/drivers/base/node.c > > +++ b/drivers/base/node.c > > @@ -390,6 +390,9 @@ int register_mem_sect_under_node(struct memory_block > > *mem_blk, int nid) > > sect_no <= mem_blk->end_section_nr; > > sect_no++) { > > > > + if (!present_section_nr(sect_no)) > > + continue; > > + > > sect_start_pfn = section_nr_to_pfn(sect_no); > > sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; > > > > -- > > 1.8.3.1 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node 2015-09-09 11:11 ` Jan Stancek @ 2015-09-22 8:27 ` Jan Stancek 2015-10-04 12:06 ` Greg KH 0 siblings, 1 reply; 6+ messages in thread From: Jan Stancek @ 2015-09-22 8:27 UTC (permalink / raw) To: gregkh; +Cc: linux-kernel, linux-mm, Dave Young ----- Original Message ----- > From: "Jan Stancek" <jstancek@redhat.com> > To: gregkh@linuxfoundation.org > Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Dave Young" <dyoung@redhat.com> > Sent: Wednesday, 9 September, 2015 1:11:23 PM > Subject: Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node > > Greg, > > any thoughts about the patch? ping > > Regards, > Jan > > ----- Original Message ----- > > From: "Dave Young" <dyoung@redhat.com> > > To: "Jan Stancek" <jstancek@redhat.com> > > Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, > > linux-mm@kvack.org > > Sent: Tuesday, 1 September, 2015 9:15:53 AM > > Subject: Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in > > register_mem_sect_under_node > > > > On 08/27/15 at 04:43pm, Jan Stancek wrote: > > > Skip non-present sections in mem_blk to avoid crashing during boot > > > at register_mem_sect_under_node()->get_nid_for_pfn(): > > > > > > Unable to handle kernel paging request for data at address > > > 0xf000000000080020 > > > Faulting instruction address: 0xc00000000866b480 > > > Oops: Kernel access of bad area, sig: 11 [#1] > > > SMP NR_CPUS=2048 NUMA pSeries > > > Modules linked in: > > > CPU: 14 PID: 1 Comm: swapper/14 Not tainted 4.2.0-rc8+ #6 > > > task: c00000001e480000 ti: c00000001e500000 task.ti: c00000001e500000 > > > NIP: c00000000866b480 LR: c00000000851aecc CTR: 0000000000000400 > > > ... > > > NIP [c00000000866b480] get_nid_for_pfn+0x10/0x30 > > > LR [c00000000851aecc] register_mem_sect_under_node+0x9c/0x190 > > > Call Trace: > > > [c00000001e503b10] [c0000000084f89a4] put_device+0x24/0x40 (unreliable) > > > [c00000001e503b60] [c00000000851b3d4] register_one_node+0x2b4/0x390 > > > [c00000001e503bc0] [c000000008ae7a50] topology_init+0x4c/0x1e8 > > > [c00000001e503c30] [c00000000800b3bc] do_one_initcall+0x10c/0x260 > > > [c00000001e503d00] [c000000008ae41b4] kernel_init_freeable+0x27c/0x364 > > > [c00000001e503dc0] [c00000000800bc14] kernel_init+0x24/0x130 > > > [c00000001e503e30] [c000000008009530] ret_from_kernel_thread+0x5c/0xac > > > Instruction dump: > > > 4e800020 60000000 60000000 60420000 3b80ffed 4bffffc8 00000000 00000000 > > > 3920ffff 78633664 792900c4 7d434a14 <e94a0020> 2faa0000 41de0010 > > > 7c63482a > > > ---[ end trace e9ab4a173e0cee14 ]--- > > > > > > This has been observed during kdump kernel boot on ppc64le KVM guest > > > (page size: 65536, sections_per_block: 16, PAGES_PER_SECTION: 256) > > > where kdump adds "rtas" to list of usable regions: > > > # hexdump -C /sys/firmware/devicetree/base/rtas/linux,rtas-base > > > 00000000 2f ff 00 00 |/...| > > > > > > [ 0.000000] Early memory node ranges > > > [ 0.000000] node 0: [mem 0x0000000000000000-0x000000001fffffff] > > > [ 0.000000] node 0: [mem 0x000000002fff0000-0x000000002fffffff] > > > > > > Crash happens when register_mem_sect_under_node goes over mem_blk that > > > spans sections 32-47, 32-46 are not present, 47 is present: > > > 32 * 256 * 65536 == 0x20000000 > > > 47 * 256 * 65536 == 0x2f000000 > > > It tries to access page for first pfn of this mem_blk (8192 == 32 * 256) > > > and crashes. > > > > > > Signed-off-by: Jan Stancek <jstancek@redhat.com> > > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > > --- > > > drivers/base/node.c | 3 +++ > > > 1 file changed, 3 insertions(+) > > > > > > diff --git a/drivers/base/node.c b/drivers/base/node.c > > > index 4c7423a4b5f4..e638cfde7486 100644 > > > --- a/drivers/base/node.c > > > +++ b/drivers/base/node.c > > > @@ -390,6 +390,9 @@ int register_mem_sect_under_node(struct memory_block > > > *mem_blk, int nid) > > > sect_no <= mem_blk->end_section_nr; > > > sect_no++) { > > > > > > + if (!present_section_nr(sect_no)) > > > + continue; > > > + > > > sect_start_pfn = section_nr_to_pfn(sect_no); > > > sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; > > > > > > -- > > > 1.8.3.1 > > > > > > -- > > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" > > > in > > > the body of a message to majordomo@vger.kernel.org > > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > Please read the FAQ at http://www.tux.org/lkml/ > > > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node 2015-09-22 8:27 ` Jan Stancek @ 2015-10-04 12:06 ` Greg KH 2015-10-05 8:31 ` Jan Stancek 0 siblings, 1 reply; 6+ messages in thread From: Greg KH @ 2015-10-04 12:06 UTC (permalink / raw) To: Jan Stancek; +Cc: linux-kernel, linux-mm, Dave Young On Tue, Sep 22, 2015 at 04:27:01AM -0400, Jan Stancek wrote: > > > > > ----- Original Message ----- > > From: "Jan Stancek" <jstancek@redhat.com> > > To: gregkh@linuxfoundation.org > > Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Dave Young" <dyoung@redhat.com> > > Sent: Wednesday, 9 September, 2015 1:11:23 PM > > Subject: Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node > > > > Greg, > > > > any thoughts about the patch? > > ping I need some -mm people to sign off on it, as this code is tricky and I think has caused problems in the past, and I know nothing about it... So please resend and get some acks from them and I'll be glad to take it. thanks, greg k-h -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node 2015-10-04 12:06 ` Greg KH @ 2015-10-05 8:31 ` Jan Stancek 0 siblings, 0 replies; 6+ messages in thread From: Jan Stancek @ 2015-10-05 8:31 UTC (permalink / raw) To: Greg KH; +Cc: linux-kernel, linux-mm, Dave Young ----- Original Message ----- > From: "Greg KH" <gregkh@linuxfoundation.org> > To: "Jan Stancek" <jstancek@redhat.com> > Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Dave Young" <dyoung@redhat.com> > Sent: Sunday, 4 October, 2015 2:06:39 PM > Subject: Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections in register_mem_sect_under_node > > On Tue, Sep 22, 2015 at 04:27:01AM -0400, Jan Stancek wrote: > > > > > > > > > > ----- Original Message ----- > > > From: "Jan Stancek" <jstancek@redhat.com> > > > To: gregkh@linuxfoundation.org > > > Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Dave Young" > > > <dyoung@redhat.com> > > > Sent: Wednesday, 9 September, 2015 1:11:23 PM > > > Subject: Re: [PATCH 2/2] drivers/base/node.c: skip non-present sections > > > in register_mem_sect_under_node > > > > > > Greg, > > > > > > any thoughts about the patch? > > > > ping > > I need some -mm people to sign off on it, as this code is tricky and I > think has caused problems in the past, and I know nothing about it... Thanks for response, get_maintainer.pl was giving me only your name. > > So please resend and get some acks from them and I'll be glad to take > it. It looks like someone has already beat me to it: commit 04697858d89e4bf2650364f8d6956e2554e8ef88 mm: check if section present during memory block registering Regards, Jan > > thanks, > > greg k-h > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> ^ permalink raw reply [flat|nested] 6+ messages in thread
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2015-09-01 7:15 ` [PATCH 1/2] drivers/base/node.c: split loop in register_mem_sect_under_node Dave Young
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2015-09-01 7:15 ` [PATCH 2/2] drivers/base/node.c: skip non-present sections " Dave Young
2015-09-09 11:11 ` Jan Stancek
2015-09-22 8:27 ` Jan Stancek
2015-10-04 12:06 ` Greg KH
2015-10-05 8:31 ` Jan Stancek
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