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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-09-07 20:10:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-09-07 20:10:06 -0700 |
| commit | 6a5c75ce10cbfc805a4e6305638d6329a3beb77a (patch) | |
| tree | 7b29fbf21ee68f0979964b87154ef5538a4cdc8d | |
| parent | cfa7c641ded6e67a8d8fc54bd24f53a60465e68f (diff) | |
| parent | 3189eddbcafcc4d827f7f19facbeddec4424eba8 (diff) | |
Merge branch 'for-3.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
Pull percpu fixes from Tejun Heo:
"One patch to fix a failure path in the alloc path. The bug is
dangerous but probably not too likely to actually trigger in the wild
given that there hasn't been any report yet.
The other two are low impact fixes"
* 'for-3.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
percpu: free percpu allocation info for uniprocessor system
percpu: perform tlb flush after pcpu_map_pages() failure
percpu: fix pcpu_alloc_pages() failure path
| -rw-r--r-- | mm/percpu-vm.c | 22 | ||||
| -rw-r--r-- | mm/percpu.c | 2 |
2 files changed, 18 insertions, 6 deletions
diff --git a/mm/percpu-vm.c b/mm/percpu-vm.c index 3707c71ae4cd..51108165f829 100644 --- a/mm/percpu-vm.c +++ b/mm/percpu-vm.c @@ -108,7 +108,7 @@ static int pcpu_alloc_pages(struct pcpu_chunk *chunk, int page_start, int page_end) { const gfp_t gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_COLD; - unsigned int cpu; + unsigned int cpu, tcpu; int i; for_each_possible_cpu(cpu) { @@ -116,14 +116,23 @@ static int pcpu_alloc_pages(struct pcpu_chunk *chunk, struct page **pagep = &pages[pcpu_page_idx(cpu, i)]; *pagep = alloc_pages_node(cpu_to_node(cpu), gfp, 0); - if (!*pagep) { - pcpu_free_pages(chunk, pages, populated, - page_start, page_end); - return -ENOMEM; - } + if (!*pagep) + goto err; } } return 0; + +err: + while (--i >= page_start) + __free_page(pages[pcpu_page_idx(cpu, i)]); + + for_each_possible_cpu(tcpu) { + if (tcpu == cpu) + break; + for (i = page_start; i < page_end; i++) + __free_page(pages[pcpu_page_idx(tcpu, i)]); + } + return -ENOMEM; } /** @@ -263,6 +272,7 @@ err: __pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start), page_end - page_start); } + pcpu_post_unmap_tlb_flush(chunk, page_start, page_end); return err; } diff --git a/mm/percpu.c b/mm/percpu.c index 2139e30a4b44..da997f9800bd 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1932,6 +1932,8 @@ void __init setup_per_cpu_areas(void) if (pcpu_setup_first_chunk(ai, fc) < 0) panic("Failed to initialize percpu areas."); + + pcpu_free_alloc_info(ai); } #endif /* CONFIG_SMP */ |