Hi The report link for this issue is: https://bugzilla.suse.com/show_bug.cgi?id=1092687 Thanks and regards > -----Original Message----- > From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] > Sent: 2018年6月23日 7:20 > To: Guomin Chen <guomin.chen@xxxxxxxx> > Cc: Brijesh Singh <brijesh.singh@xxxxxxx>; Tom Lendacky > <thomas.lendacky@xxxxxxx>; Yaowei Bai > <baiyaowei@xxxxxxxxxxxxxxxxxxxx>; Bjorn Helgaas <bhelgaas@xxxxxxxxxx>; > Toshi Kani <toshi.kani@xxxxxxx>; Dan Williams <dan.j.williams@xxxxxxxxx>; > Thomas Gleixner <tglx@xxxxxxxxxxxxx>; Andrew Morton > <akpm@xxxxxxxxxxxxxxxxxxxx>; Joey Lee <JLee@xxxxxxxx>; Borislav Petkov > <bp@xxxxxxx>; Takashi Iwai <tiwai@xxxxxxx>; linux-efi@xxxxxxxxxxxxxxx; > linux-kernel@xxxxxxxxxxxxxxx > Subject: Re: [PATCH 1/1] resource: Fixed iomem resource release failed on > release_mem_region_adjustable() when memory node or cpu node > hot-remove. > > [+cc Toshi] > > On Fri, Jun 22, 2018 at 08:01:38PM +0800, guomin chen wrote: > > We've got a bug report indicating the hot-remove node resource release > > failed,when the memory on this node is divided into several > > sections.because the release_mem_region_adjustable() can only release > > one resource that must be [start,end]. > > Can you please include a URL for the bug report? That's useful for additional > details and gives hints about how future changes in this area might be tested. > > release_mem_region_adjustable() and the only call to it were added by Toshi > (cc'd): > > 825f787bb496 ("resource: add release_mem_region_adjustable()") > fe74ebb106a5 ("mm: change __remove_pages() to call > release_mem_region_adjustable()") > > > In my case, the BIOS supports faulty memory isolation. if BIOS > > detected bad memory block, the BIOS will isolates this badblock. > > And set this badblock memory to EfiUnusableMemory in EFI memory map > > base on UEFI 2.7 spec.For example in my system, the memory range on > > node2 is [mem 0x0000080000000000-0x00000807ffffffff].but the BIOS > > detected the [8004e000000-8004e0fffff] is a badblock memory. > > So the memory on node2 seem like this: > > 80000000000-8004dffffff : System RAM > > 8004e000000-8004e0fffff : Unusable memory > > 8004e100000-807ffffffff : System RAM > > > > Now, when offline the cpu node2,the kernel will try to release > > ioresource [mem 0x0000080000000000-0x00000807ffffffff]. at this time, > > the kernel will release failed,and output error message: > > "Unable to release resource <0x0000080000000000-0x00000807ffffffff> > > (-22)". > > Because the release_mem_region_adjustable() can only release one > > resource that must be [0x0000080000000000 , 0x00000807ffffffff]. > > but now,the iomem resource on node2 [0x0000080000000000, > > 0x00000807ffffffff] are divided into three resources [80000000000- > > 8004dffffff],[8004e000000-8004e0fffff]and[8004e100000-807ffffffff]. > > > > This patch help to Release multiple iomem resources at once when node > > hot-remove. Such as in above case, when hot-remove the cpu node2,the > > kernel will try to release resource [0x0000080000000000- > > 0x00000807ffffffff].And this patch will release three resources > > [80000000000-8004dffffff],[8004e000000-8004e0fffff] and > > [8004e100000-807ffffffff]. > > > > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > > Cc: Brijesh Singh <brijesh.singh@xxxxxxx> > > Cc: Borislav Petkov <bp@xxxxxxx> > > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > > Cc: Tom Lendacky <thomas.lendacky@xxxxxxx> > > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > > Cc: Yaowei Bai <baiyaowei@xxxxxxxxxxxxxxxxxxxx> > > Cc: Takashi Iwai <tiwai@xxxxxxx> > > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > > Cc: linux-efi@xxxxxxxxxxxxxxx > > Cc: linux-kernel@xxxxxxxxxxxxxxx > > Cc: Lee Chun-Yi <JLee@xxxxxxxx> > > Signed-off-by: guomin chen <guomin.chen@xxxxxxxx> > > --- > > kernel/resource.c | 73 > > ++++++++++++++++++++++++++++++++----------------------- > > 1 file changed, 43 insertions(+), 30 deletions(-) > > > > diff --git a/kernel/resource.c b/kernel/resource.c index > > 30e1bc68503b..959bcce4c405 100644 > > --- a/kernel/resource.c > > +++ b/kernel/resource.c > > @@ -1240,6 +1240,7 @@ int release_mem_region_adjustable(struct > resource *parent, > > struct resource *res; > > struct resource *new_res; > > resource_size_t end; > > + resource_size_t new_start = start; > > int ret = -EINVAL; > > > > end = start + size - 1; > > @@ -1257,7 +1258,7 @@ int release_mem_region_adjustable(struct > resource *parent, > > break; > > > > /* look for the next resource if it does not fit into */ > > - if (res->start > start || res->end < end) { > > + if (res->end < new_start) { > > p = &res->sibling; > > continue; > > } > > @@ -1271,42 +1272,54 @@ int release_mem_region_adjustable(struct > resource *parent, > > } > > > > /* found the target resource; let's adjust accordingly */ > > - if (res->start == start && res->end == end) { > > + if (res->start == new_start && res->end == end) { > > /* free the whole entry */ > > *p = res->sibling; > > free_resource(res); > > ret = 0; > > - } else if (res->start == start && res->end != end) { > > - /* adjust the start */ > > - ret = __adjust_resource(res, end + 1, > > - res->end - end); > > - } else if (res->start != start && res->end == end) { > > - /* adjust the end */ > > - ret = __adjust_resource(res, res->start, > > - start - res->start); > > + } else if (res->end > end) { > > + if (res->start >= new_start) { > > + /* adjust the start */ > > + ret = __adjust_resource(res, end + 1, > > + res->end - end); > > + } else { > > + /* split into two entries */ > > + if (!new_res) { > > + ret = -ENOMEM; > > + break; > > + } > > + new_res->name = res->name; > > + new_res->start = end + 1; > > + new_res->end = res->end; > > + new_res->flags = res->flags; > > + new_res->desc = res->desc; > > + new_res->parent = res->parent; > > + new_res->sibling = res->sibling; > > + new_res->child = NULL; > > + > > + ret = __adjust_resource(res, res->start, > > + new_start - res->start); > > + if (ret) > > + break; > > + res->sibling = new_res; > > + new_res = NULL; > > + } > > } else { > > - /* split into two entries */ > > - if (!new_res) { > > - ret = -ENOMEM; > > - break; > > + if (res->start < new_start) { > > + /* adjust the end */ > > + ret = __adjust_resource(res, res->start, > > + new_start - res->start); > > + new_start = res->end+1; > > + p = &res->sibling; > > + } else { > > + new_start = res->end+1; > > + *p = res->sibling; > > + free_resource(res); > > + ret = 0; > > } > > - new_res->name = res->name; > > - new_res->start = end + 1; > > - new_res->end = res->end; > > - new_res->flags = res->flags; > > - new_res->desc = res->desc; > > - new_res->parent = res->parent; > > - new_res->sibling = res->sibling; > > - new_res->child = NULL; > > - > > - ret = __adjust_resource(res, res->start, > > - start - res->start); > > - if (ret) > > - break; > > - res->sibling = new_res; > > - new_res = NULL; > > + if (res->end < end) > > + continue; > > } > > - > > break; > > } > > > > -- > > 2.12.3 > > ?韬{.n?????%??檩??w?{.n???{饼玮??骅w* jg????????G??⒏ ⒎?:+v???????? ????＂??????
