cregit-Linux how code gets into the kernel

Release 4.10 tools/perf/trace/beauty/futex_op.c

#include <linux/futex.h>

#ifndef FUTEX_WAIT_BITSET

#define FUTEX_WAIT_BITSET	  9
#endif
#ifndef FUTEX_WAKE_BITSET

#define FUTEX_WAKE_BITSET	 10
#endif
#ifndef FUTEX_WAIT_REQUEUE_PI

#define FUTEX_WAIT_REQUEUE_PI	 11
#endif
#ifndef FUTEX_CMP_REQUEUE_PI

#define FUTEX_CMP_REQUEUE_PI	 12
#endif
#ifndef FUTEX_CLOCK_REALTIME

#define FUTEX_CLOCK_REALTIME	256
#endif


static size_t syscall_arg__scnprintf_futex_op(char *bf, size_t size, struct syscall_arg *arg) { enum syscall_futex_args { SCF_UADDR = (1 << 0), SCF_OP = (1 << 1), SCF_VAL = (1 << 2), SCF_TIMEOUT = (1 << 3), SCF_UADDR2 = (1 << 4), SCF_VAL3 = (1 << 5), }; int op = arg->val; int cmd = op & FUTEX_CMD_MASK; size_t printed = 0; switch (cmd) { #define P_FUTEX_OP(n) case FUTEX_##n: printed = scnprintf(bf, size, #n); P_FUTEX_OP(WAIT); arg->mask |= SCF_VAL3|SCF_UADDR2; break; P_FUTEX_OP(WAKE); arg->mask |= SCF_VAL3|SCF_UADDR2|SCF_TIMEOUT; break; P_FUTEX_OP(FD); arg->mask |= SCF_VAL3|SCF_UADDR2|SCF_TIMEOUT; break; P_FUTEX_OP(REQUEUE); arg->mask |= SCF_VAL3|SCF_TIMEOUT; break; P_FUTEX_OP(CMP_REQUEUE); arg->mask |= SCF_TIMEOUT; break; P_FUTEX_OP(CMP_REQUEUE_PI); arg->mask |= SCF_TIMEOUT; break; P_FUTEX_OP(WAKE_OP); break; P_FUTEX_OP(LOCK_PI); arg->mask |= SCF_VAL3|SCF_UADDR2|SCF_TIMEOUT; break; P_FUTEX_OP(UNLOCK_PI); arg->mask |= SCF_VAL3|SCF_UADDR2|SCF_TIMEOUT; break; P_FUTEX_OP(TRYLOCK_PI); arg->mask |= SCF_VAL3|SCF_UADDR2; break; P_FUTEX_OP(WAIT_BITSET); arg->mask |= SCF_UADDR2; break; P_FUTEX_OP(WAKE_BITSET); arg->mask |= SCF_UADDR2; break; P_FUTEX_OP(WAIT_REQUEUE_PI); break; default: printed = scnprintf(bf, size, "%#x", cmd); break; } if (op & FUTEX_PRIVATE_FLAG) printed += scnprintf(bf + printed, size - printed, "|PRIV"); if (op & FUTEX_CLOCK_REALTIME) printed += scnprintf(bf + printed, size - printed, "|CLKRT"); return printed; }

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#define SCA_FUTEX_OP syscall_arg__scnprintf_futex_op

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