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| author | Brian Brooks <brian.brooks@linaro.org> | 2018-07-25 16:08:19 -0500 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-07-27 03:49:02 +0200 |
| commit | 598135e7444c121f11c8c16495ba1e6ab122678f (patch) | |
| tree | 6e13ac796fad3cad2a7a1662a8364c93e70bcf98 /samples | |
| parent | 08a852528e9678f0854af331f19747f2b2a73c06 (diff) | |
| download | lwn-598135e7444c121f11c8c16495ba1e6ab122678f.tar.gz lwn-598135e7444c121f11c8c16495ba1e6ab122678f.zip | |
samples/bpf: xdpsock: order memory on AArch64
Define u_smp_rmb() and u_smp_wmb() to respective barrier instructions.
This ensures the processor will order accesses to queue indices against
accesses to queue ring entries.
Signed-off-by: Brian Brooks <brian.brooks@linaro.org>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/xdpsock_user.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c index 5904b1543831..1e82f7c617c3 100644 --- a/samples/bpf/xdpsock_user.c +++ b/samples/bpf/xdpsock_user.c @@ -145,8 +145,13 @@ static void dump_stats(void); } while (0) #define barrier() __asm__ __volatile__("": : :"memory") +#ifdef __aarch64__ +#define u_smp_rmb() __asm__ __volatile__("dmb ishld": : :"memory") +#define u_smp_wmb() __asm__ __volatile__("dmb ishst": : :"memory") +#else #define u_smp_rmb() barrier() #define u_smp_wmb() barrier() +#endif #define likely(x) __builtin_expect(!!(x), 1) #define unlikely(x) __builtin_expect(!!(x), 0) |