From 74d00a8c3849c1340efd713eb94b786e304c201f Mon Sep 17 00:00:00 2001 From: John Crispin Date: Sun, 25 Dec 2016 20:11:34 +0100 Subject: kernel: split patches folder up into backport, pending and hack folders * properly format/comment all patches * merge debloat patches * merge Kconfig patches * merge swconfig patches * merge hotplug patches * drop 200-fix_localversion.patch - upstream * drop 222-arm_zimage_none.patch - unused * drop 252-mv_cesa_depends.patch - no longer required * drop 410-mtd-move-forward-declaration-of-struct-mtd_info.patch - unused * drop 661-fq_codel_keep_dropped_stats.patch - outdated * drop 702-phy_add_aneg_done_function.patch - upstream * drop 840-rtc7301.patch - unused * drop 841-rtc_pt7c4338.patch - upstream * drop 921-use_preinit_as_init.patch - unused * drop spio-gpio-old and gpio-mmc - unused Signed-off-by: John Crispin --- ...c_node_mem_map-with-ARCH_PFN_OFFSET-calcu.patch | 82 ++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 target/linux/generic/pending-4.9/120-Fix-alloc_node_mem_map-with-ARCH_PFN_OFFSET-calcu.patch (limited to 'target/linux/generic/pending-4.9/120-Fix-alloc_node_mem_map-with-ARCH_PFN_OFFSET-calcu.patch') diff --git a/target/linux/generic/pending-4.9/120-Fix-alloc_node_mem_map-with-ARCH_PFN_OFFSET-calcu.patch b/target/linux/generic/pending-4.9/120-Fix-alloc_node_mem_map-with-ARCH_PFN_OFFSET-calcu.patch new file mode 100644 index 0000000000..a5d3a3db32 --- /dev/null +++ b/target/linux/generic/pending-4.9/120-Fix-alloc_node_mem_map-with-ARCH_PFN_OFFSET-calcu.patch @@ -0,0 +1,82 @@ +From: Tobias Wolf +Subject: mm: Fix alloc_node_mem_map with ARCH_PFN_OFFSET calculation + +An rt288x (ralink) based router (Belkin F5D8235 v1) does not boot with any +kernel beyond version 4.3 resulting in: + +BUG: Bad page state in process swapper pfn:086ac + +bisect resulted in: + +a1c34a3bf00af2cede839879502e12dc68491ad5 is the first bad commit +commit a1c34a3bf00af2cede839879502e12dc68491ad5 +Author: Laura Abbott +Date: Thu Nov 5 18:48:46 2015 -0800 + + mm: Don't offset memmap for flatmem + + Srinivas Kandagatla reported bad page messages when trying to remove the + bottom 2MB on an ARM based IFC6410 board + + BUG: Bad page state in process swapper pfn:fffa8 + page:ef7fb500 count:0 mapcount:0 mapping: (null) index:0x0 + flags: 0x96640253(locked|error|dirty|active|arch_1|reclaim|mlocked) + page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set + bad because of flags: + flags: 0x200041(locked|active|mlocked) + Modules linked in: + CPU: 0 PID: 0 Comm: swapper Not tainted 3.19.0-rc3-00007-g412f9ba-dirty +#816 + Hardware name: Qualcomm (Flattened Device Tree) + unwind_backtrace + show_stack + dump_stack + bad_page + free_pages_prepare + free_hot_cold_page + __free_pages + free_highmem_page + mem_init + start_kernel + Disabling lock debugging due to kernel taint + [...] +:040000 040000 2de013c372345fd471cd58f0553c9b38b0ef1cc4 +0a8156f848733dfa21e16c196dfb6c0a76290709 M mm + +This fix for ARM does not account ARCH_PFN_OFFSET for mem_map as later used by +page_to_pfn anymore. + +The following output was generated with two hacked in printk statements: + +printk("before %p vs. %p or %p\n", mem_map, mem_map - offset, mem_map - +(pgdat->node_start_pfn - ARCH_PFN_OFFSET)); + if (page_to_pfn(mem_map) != pgdat->node_start_pfn) + mem_map -= offset + (pgdat->node_start_pfn - ARCH_PFN_OFFSET); +printk("after %p\n", mem_map); + +Output: + +[ 0.000000] before 8861b280 vs. 8861b280 or 8851b280 +[ 0.000000] after 8851b280 + +As seen in the first line mem_map with subtraction of offset does not equal the +mem_map after subtraction of ARCH_PFN_OFFSET. + +After adding the offset of ARCH_PFN_OFFSET as well to mem_map as the +previously calculated offset is zero for the named platform it is able to boot +4.4 and 4.9-rc7 again. + +Signed-off-by: Tobias Wolf +--- + +--- a/mm/page_alloc.c ++++ b/mm/page_alloc.c +@@ -5905,7 +5905,7 @@ static void __ref alloc_node_mem_map(str + mem_map = NODE_DATA(0)->node_mem_map; + #if defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) || defined(CONFIG_FLATMEM) + if (page_to_pfn(mem_map) != pgdat->node_start_pfn) +- mem_map -= offset; ++ mem_map -= offset + (pgdat->node_start_pfn - ARCH_PFN_OFFSET); + #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ + } + #endif -- cgit v1.2.3