/* * Regression2 * Description: * Toshiyuki Okajima describes the following radix-tree bug: * * In the following case, we can get a hangup on * radix_radix_tree_gang_lookup_tag_slot. * * 0. The radix tree contains RADIX_TREE_MAP_SIZE items. And the tag of * a certain item has PAGECACHE_TAG_DIRTY. * 1. radix_tree_range_tag_if_tagged(, start, end, , PAGECACHE_TAG_DIRTY, * PAGECACHE_TAG_TOWRITE) is called to add PAGECACHE_TAG_TOWRITE tag * for the tag which has PAGECACHE_TAG_DIRTY. However, there is no tag with * PAGECACHE_TAG_DIRTY within the range from start to end. As the result, * There is no tag with PAGECACHE_TAG_TOWRITE but the root tag has * PAGECACHE_TAG_TOWRITE. * 2. An item is added into the radix tree and then the level of it is * extended into 2 from 1. At that time, the new radix tree node succeeds * the tag status of the root tag. Therefore the tag of the new radix tree * node has PAGECACHE_TAG_TOWRITE but there is not slot with * PAGECACHE_TAG_TOWRITE tag in the child node of the new radix tree node. * 3. The tag of a certain item is cleared with PAGECACHE_TAG_DIRTY. * 4. All items within the index range from 0 to RADIX_TREE_MAP_SIZE - 1 are * released. (Only the item which index is RADIX_TREE_MAP_SIZE exist in the * radix tree.) As the result, the slot of the radix tree node is NULL but * the tag which corresponds to the slot has PAGECACHE_TAG_TOWRITE. * 5. radix_tree_gang_lookup_tag_slot(PAGECACHE_TAG_TOWRITE) calls * __lookup_tag. __lookup_tag returns with 0. And __lookup_tag doesn't * change the index that is the input and output parameter. Because the 1st * slot of the radix tree node is NULL, but the tag which corresponds to * the slot has PAGECACHE_TAG_TOWRITE. * Therefore radix_tree_gang_lookup_tag_slot tries to get some items by * calling __lookup_tag, but it cannot get any items forever. * * The fix is to change that radix_tree_tag_if_tagged doesn't tag the root tag * if it doesn't set any tags within the specified range. * * Running: * This test should run to completion immediately. The above bug would cause it * to hang indefinitely. * * Upstream commit: * Not yet */ #include #include #include #include #include #include #include "regression.h" #include "test.h" #define PAGECACHE_TAG_DIRTY 0 #define PAGECACHE_TAG_WRITEBACK 1 #define PAGECACHE_TAG_TOWRITE 2 static RADIX_TREE(mt_tree, GFP_KERNEL); unsigned long page_count = 0; struct page { unsigned long index; }; static struct page *page_alloc(void) { struct page *p; p = malloc(sizeof(struct page)); p->index = page_count++; return p; } void regression2_test(void) { int i; struct page *p; int max_slots = RADIX_TREE_MAP_SIZE; unsigned long int start, end; struct page *pages[1]; printf("running regression test 2 (should take milliseconds)\n"); /* 0. */ for (i = 0; i <= max_slots - 1; i++) { p = page_alloc(); radix_tree_insert(&mt_tree, i, p); } radix_tree_tag_set(&mt_tree, max_slots - 1, PAGECACHE_TAG_DIRTY); /* 1. */ start = 0; end = max_slots - 2; tag_tagged_items(&mt_tree, NULL, start, end, 1, PAGECACHE_TAG_DIRTY, PAGECACHE_TAG_TOWRITE); /* 2. */ p = page_alloc(); radix_tree_insert(&mt_tree, max_slots, p); /* 3. */ radix_tree_tag_clear(&mt_tree, max_slots - 1, PAGECACHE_TAG_DIRTY); /* 4. */ for (i = max_slots - 1; i >= 0; i--) radix_tree_delete(&mt_tree, i); /* 5. */ // NOTE: start should not be 0 because radix_tree_gang_lookup_tag_slot // can return. start = 1; end = max_slots - 2; radix_tree_gang_lookup_tag_slot(&mt_tree, (void ***)pages, start, end, PAGECACHE_TAG_TOWRITE); /* We remove all the remained nodes */ radix_tree_delete(&mt_tree, max_slots); printf("regression test 2, done\n"); } git.cgi/linux/net-next.git/log/include/dt-bindings/clock/alphascale,asm9260.h?h=nds-private-remove&id=f2f3e210bffe5c8f8b30d0b0c7b0f733ff5db334'>logplain -rw-r--r--at91.h751log plain -rw-r--r--ath79-clk.h479log plain -rw-r--r--axis,artpec6-clkctrl.h1112log plain -rw-r--r--bcm-cygnus.h3135log plain -rw-r--r--bcm-ns2.h2915log plain -rw-r--r--bcm-nsp.h2148log plain -rw-r--r--bcm21664.h1984log plain -rw-r--r--bcm281xx.h2456log plain -rw-r--r--bcm2835-aux.h635log plain -rw-r--r--bcm2835.h1962log plain -rw-r--r--berlin2.h1034log plain -rw-r--r--berlin2q.h695log plain -rw-r--r--clps711x-clock.h718log plain -rw-r--r--efm32-cmu.h1112log plain -rw-r--r--exynos-audss-clk.h597log plain -rw-r--r--exynos3250.h9083log plain -rw-r--r--exynos4.h8284log plain -rw-r--r--exynos4415.h9828log plain -rw-r--r--exynos5250.h4616log plain -rw-r--r--exynos5260-clk.h14876log plain -rw-r--r--exynos5410.h1689log plain -rw-r--r--exynos5420.h6857log plain -rw-r--r--exynos5433.h45372log plain -rw-r--r--exynos5440.h1141log plain -rw-r--r--exynos7-clk.h5281log plain -rw-r--r--gxbb-aoclkc.h2866log plain -rw-r--r--gxbb-clkc.h592log plain -rw-r--r--hi3516cv300-clock.h1668log plain -rw-r--r--hi3519-clock.h1328log plain -rw-r--r--hi3620-clock.h4496log plain -rw-r--r--hi6220-clock.h4508log plain -rw-r--r--hip04-clock.h1137log plain -rw-r--r--histb-clock.h2012log plain -rw-r--r--hix5hd2-clock.h2415log plain -rw-r--r--imx1-clock.h1055log plain -rw-r--r--imx21-clock.h2461log plain -rw-r--r--imx27-clock.h3494log plain -rw-r--r--imx5-clock.h7212log plain -rw-r--r--imx6qdl-clock.h9593log plain -rw-r--r--imx6sl-clock.h5849log plain -rw-r--r--imx6sx-clock.h9099log plain -rw-r--r--imx6ul-clock.h8203log plain -rw-r--r--imx7d-clock.h15974log plain -rw-r--r--jz4740-cgu.h1028log plain -rw-r--r--jz4780-cgu.h2470log plain -rw-r--r--lpc18xx-ccu.h2134log plain -rw-r--r--lpc18xx-cgu.h1142log plain -rw-r--r--lpc32xx-clock.h1633log plain -rw-r--r--lsi,axm5516-clks.h974log plain -rw-r--r--marvell,mmp2.h2022log plain -rw-r--r--marvell,pxa168.h1654log plain -rw-r--r--marvell,pxa1928.h1535log plain -rw-r--r--marvell,pxa910.h1598log plain -rw-r--r--maxim,max77620.h632log plain -rw-r--r--maxim,max77686.h648log plain -rw-r--r--maxim,max77802.h630log plain -rw-r--r--meson8b-clkc.h523log plain -rw-r--r--microchip,pic32-clock.h1150log plain -rw-r--r--mpc512x-clock.h2236log plain -rw-r--r--mt2701-clk.h13832log plain -rw-r--r--mt8135-clk.h5641log plain -rw-r--r--mt8173-clk.h9293log plain -rw-r--r--oxsemi,ox810se.h1002log plain -rw-r--r--oxsemi,ox820.h1203log plain -rw-r--r--pistachio-clk.h4863log plain -rw-r--r--pxa-clock.h1715log plain -rw-r--r--qcom,gcc-apq8084.h12872log plain -rw-r--r--qcom,gcc-ipq4019.h5423log plain -rw-r--r--qcom,gcc-ipq806x.h8574log plain -rw-r--r--qcom,gcc-mdm9615.h9497log plain -rw-r--r--qcom,gcc-msm8660.h7932log plain -rw-r--r--qcom,gcc-msm8916.h6190log plain -rw-r--r--qcom,gcc-msm8960.h9342log plain -rw-r--r--qcom,gcc-msm8974.h12340log plain -rw-r--r--qcom,gcc-msm8994.h4858log plain -rw-r--r--qcom,gcc-msm8996.h12575log plain -rw-r--r--qcom,lcc-ipq806x.h899log plain -rw-r--r--qcom,lcc-mdm9615.h1701log plain -rw-r--r--qcom,lcc-msm8960.h1616log plain -rw-r--r--qcom,mmcc-apq8084.h5722log plain -rw-r--r--qcom,mmcc-msm8960.h4109log plain -rw-r--r--qcom,mmcc-msm8974.h5223log plain -rw-r--r--qcom,mmcc-msm8996.h9403log plain -rw-r--r--qcom,rpmcc.h2101log plain -rw-r--r--r7s72100-clock.h1218log plain -rw-r--r--r8a73a4-clock.h1596log plain -rw-r--r--r8a7740-clock.h1992log plain -rw-r--r--r8a7743-cpg-mssr.h1269log plain -rw-r--r--r8a7745-cpg-mssr.h1298log plain -rw-r--r--r8a7778-clock.h1855log plain -rw-r--r--r8a7779-clock.h1647log plain -rw-r--r--r8a7790-clock.h4367log plain -rw-r--r--r8a7791-clock.h4388log plain -rw-r--r--r8a7792-clock.h2562log plain -rw-r--r--r8a7793-clock.h4561log plain -rw-r--r--r8a7794-clock.h3679log plain -rw-r--r--r8a7795-cpg-mssr.h1890log plain -rw-r--r--r8a7796-cpg-mssr.h2066log plain -rw-r--r--renesas-cpg-mssr.h542log plain -rw-r--r--rk1108-cru.h6605log plain -rw-r--r--rk3036-cru.h4584log plain -rw-r--r--rk3066a-cru.h1068log plain -rw-r--r--rk3188-cru-common.h6105log plain -rw-r--r--rk3188-cru.h1435log plain