mm: add zone counter for cma pages

2019-05-05T10:34:00+00:00

Add per free area nr_free_cma counter. The idea is to also track the number of cma pages present in free pages. This will be used in later patches to fix issues with zone_watermark_ok. Change-Id: I97da9d2f3642db56fc541c48ab56a7ce78e2333c Signed-off-by: Vinayak Menon Signed-off-by: Prakash Gupta (cherry picked from commit a147305588507b1a241af87f1006c5d0b30beade)

mm/page_alloc: Call kernel_map_pages in unset_migrateype_isolate

2019-05-02T19:45:18+00:00

Commit d1037ba0b85d (mm/page_alloc: restrict max order of merging on isolated pageblock) changed the logic of unset_migratetype_isolate to check the buddy allocator and explicitly call __free_pages to merge. The page that is being freed in this path never had prep_new_page called so set_page_refcounted is called explicitly but there is no call to kernel_map_pages. With the default kernel_map_pages this is mostly harmless but if kernel_map_pages does any manipulation of the page tables (unmapping or setting pages to read only) this may trigger a fault: alloc_contig_range test_pages_isolated(ceb00, ced00) failed Unable to handle kernel paging request at virtual address ffffffc0cec00000 pgd = ffffffc045fc4000 [ffffffc0cec00000] *pgd=0000000000000000 Internal error: Oops: 9600004f [#1] PREEMPT SMP Modules linked in: exfatfs CPU: 1 PID: 23237 Comm: TimedEventQueue Not tainted 3.10.49-gc72ad36-dirty #1 task: ffffffc03de52100 ti: ffffffc015388000 task.ti: ffffffc015388000 PC is at memset+0xc8/0x1c0 LR is at kernel_map_pages+0x1ec/0x244 Fix this by calling kernel_map_pages to ensure the page is set in the page table properly Change-Id: Ie0c7f38fce24683b6ddebf95874be662ef25021b Signed-off-by: Laura Abbott (cherry picked from commit 4164b8829c5a3a42be08acc8714712db0afe58e9)

first commit

2016-08-15T02:19:42+00:00

xavi/android_kernel_m2note/mm/page_isolation.c, branch o-8.1

mm: add zone counter for cma pages

mm/page_alloc: Call kernel_map_pages in unset_migrateype_isolate

first commit