| 1 | #define _GNU_SOURCE |
| 2 | #include <errno(*__errno_location()).h> |
| 3 | #include <sched.h> |
| 4 | #include "syscall.h" |
| 5 | #include "atomic.h" |
| 6 | |
| 7 | #ifdef VDSO_GETCPU_SYM |
| 8 | |
| 9 | void *__vdsosym(const char *, const char *); |
| 10 | |
| 11 | static void *volatile vdso_func; |
| 12 | |
| 13 | typedef long (*getcpu_f)(unsigned *, unsigned *, void *); |
| 14 | |
| 15 | static long getcpu_init(unsigned *cpu, unsigned *node, void *unused) |
| 16 | { |
| 17 | void *p = __vdsosym(VDSO_GETCPU_VER, VDSO_GETCPU_SYM); |
| 18 | getcpu_f f = (getcpu_f)p; |
| 19 | a_cas_pa_cas_p(&vdso_func, (void *)getcpu_init, p); |
| 20 | return f ? f(cpu, node, unused) : -ENOSYS38; |
| 21 | } |
| 22 | |
| 23 | static void *volatile vdso_func = (void *)getcpu_init; |
| 24 | |
| 25 | #endif |
| 26 | |
| 27 | int sched_getcpu(void) |
| 28 | { |
| 29 | int r; |
| 30 | unsigned cpu; |
| 1 | 'cpu' declared without an initial value | |
|
| 31 | |
| 32 | #ifdef VDSO_GETCPU_SYM |
| 33 | getcpu_f f = (getcpu_f)vdso_func; |
| 34 | if (f) { |
| 35 | r = f(&cpu, 0, 0); |
| 36 | if (!r) return cpu; |
| 37 | if (r != -ENOSYS38) return __syscall_ret(r); |
| 38 | } |
| 39 | #endif |
| 40 | |
| 41 | r = __syscall(SYS_getcpu, &cpu, 0, 0)__syscall3(345,((long) (&cpu)),((long) (0)),((long) (0))); |
| 42 | if (!r) return cpu; |
| |
| |
| 4 | | Undefined or garbage value returned to caller |
|
| 43 | return __syscall_ret(r); |
| 44 | } |