From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xishi Qiu Date: Thu, 07 Feb 2013 06:09:16 +0000 Subject: [PATCH V3] ia64/mm: fix a bad_page bug when crash kernel booting Message-Id: <5113450C.1080109@huawei.com> List-Id: References: <51074786.5030007@huawei.com> <1359995565.7515.178.camel@mfleming-mobl1.ger.corp.intel.com> <51131248.3080203@huawei.com> In-Reply-To: <51131248.3080203@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Xishi Qiu Cc: Matt Fleming , "Luck, Tony" , fenghua.yu@intel.com, Liujiang , Andrew Morton , linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, linux-mm@kvack.org, Hanjun Guo , WuJianguo > Sorry, this bug will be happen when use Sparse-Memory(section is valid, but last > several pages are invalid). If use Flat-Memory, crash kernel will boot successfully. > I think the following patch would be better. > > Hi Andrew, will you just ignore the earlier patch and consider the following one? :> > > Signed-off-by: Xishi Qiu > --- > arch/ia64/mm/init.c | 2 ++ > 1 files changed, 2 insertions(+), 0 deletions(-) > > diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c > index 082e383..23f2ee3 100644 > --- a/arch/ia64/mm/init.c > +++ b/arch/ia64/mm/init.c > @@ -213,6 +213,8 @@ free_initrd_mem (unsigned long start, unsigned long end) > for (; start < end; start += PAGE_SIZE) { > if (!virt_addr_valid(start)) > continue; > + if ((start >> PAGE_SHIFT) >= max_low_pfn) I confused the vaddr and paddr, really sorry for it. In efi_init() memory aligns in IA64_GRANULE_SIZE(16M). If set "crashkernel24M-:600M" and use sparse memory model, when crash kernel booting it changes [128M-728M] to [128M-720M]. But initrd memory is in [709M-727M], and virt_addr_valid() *can not* check the invalid pages when freeing initrd memory. There are some pages missed at the end of the seciton. ChangeLog V3: fixed vaddr mistake ChangeLog V2: add invalid pages check when freeing initrd memory Signed-off-by: Xishi Qiu --- arch/ia64/mm/init.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c index 082e383..8a269f8 100644 --- a/arch/ia64/mm/init.c +++ b/arch/ia64/mm/init.c @@ -173,6 +173,7 @@ void __init free_initrd_mem (unsigned long start, unsigned long end) { struct page *page; + unsigned long pfn; /* * EFI uses 4KB pages while the kernel can use 4KB or bigger. * Thus EFI and the kernel may have different page sizes. It is @@ -213,6 +214,9 @@ free_initrd_mem (unsigned long start, unsigned long end) for (; start < end; start += PAGE_SIZE) { if (!virt_addr_valid(start)) continue; + pfn = __pa(start) >> PAGE_SHIFT; + if (pfn >= max_low_pfn) + continue; page = virt_to_page(start); ClearPageReserved(page); init_page_count(page); -- 1.7.6.1