/* * bpf-script-example.c * Test basic LLVM building */ #ifndef LINUX_VERSION_CODE # error Need LINUX_VERSION_CODE # error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig' #endif #define BPF_ANY 0 #define BPF_MAP_TYPE_ARRAY 2 #define BPF_FUNC_map_lookup_elem 1 #define BPF_FUNC_map_update_elem 2 static void *(*bpf_map_lookup_elem)(void *map, void *key) = (void *) BPF_FUNC_map_lookup_elem; static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) = (void *) BPF_FUNC_map_update_elem; struct bpf_map_def { unsigned int type; unsigned int key_size; unsigned int value_size; unsigned int max_entries; }; #define SEC(NAME) __attribute__((section(NAME), used)) struct bpf_map_def SEC("maps") flip_table = { .type = BPF_MAP_TYPE_ARRAY, .key_size = sizeof(int), .value_size = sizeof(int), .max_entries = 1, }; SEC("func=SyS_epoll_wait") int bpf_func__SyS_epoll_wait(void *ctx) { int ind =0; int *flag = bpf_map_lookup_elem(&flip_table, &ind); int new_flag; if (!flag) return 0; /* flip flag and store back */ new_flag = !*flag; bpf_map_update_elem(&flip_table, &ind, &new_flag, BPF_ANY); return new_flag; } char _license[] SEC("license") = "GPL"; int _version SEC("version") = LINUX_VERSION_CODE; acket-rx-pump-back'>packet-rx-pump-back net-next plumbingsTobias Klauser
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-28 11:09:04 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-28 11:09:04 -0800
commitdd553962675ab5747e887f89aea1ece90e6a802e (patch)
treed999368d0921e139b7b67ea0fc6a4e6ac548d8dc /include/soc/fsl/qe
parent64a172d265643b345007ddaafcc523f6e5373b69 (diff)
parent2e38a37f23c98d7fad87ff022670060b8a0e2bf5 (diff)
Merge tag 'md/4.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
Pull MD fixes from Shaohua Li: "This fixes several corner cases for raid5 cache, which is merged into this cycle" * tag 'md/4.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md: md/r5cache: disable write back for degraded array md/r5cache: shift complex rmw from read path to write path md/r5cache: flush data only stripes in r5l_recovery_log() md/raid5: move comment of fetch_block to right location md/r5cache: read data into orig_page for prexor of cached data md/raid5-cache: delete meaningless code
Diffstat (limited to 'include/soc/fsl/qe')