On Wed, 2010-01-06 at 11:30 +0800, Miao Xie wrote:
> getcpu01 test failed because the len of cpu_set_t in the glibc is smaller than
> the length of the cpumask in the kernel. So we must use the dynamically sized
> CPU sets instead
> of the standard cpu_set_t.
>
> This patch fix this problem.
> Before using this patch, the test result is following:
> getcpu01 1 TFAIL : sched_getaffinity:errno:22
>
> After using this patch, the test result is following:
> getcpu01 1 TPASS : getcpu() returned proper cpuid:3, node id:0
>
> Signed-off-by: Miao Xie <[email protected]>
Ok. Thanks.
Regards--
Subrata
> ---
> testcases/kernel/syscalls/getcpu/getcpu01.c | 66
> +++++++++++++++++++++++----
> 1 files changed, 56 insertions(+), 10 deletions(-)
>
> diff --git a/testcases/kernel/syscalls/getcpu/getcpu01.c
> b/testcases/kernel/syscalls/getcpu/getcpu01.c
> index 9b4e52e..c13e0e7 100644
> --- a/testcases/kernel/syscalls/getcpu/getcpu01.c
> +++ b/testcases/kernel/syscalls/getcpu/getcpu01.c
> @@ -77,12 +77,16 @@ int sys_support = 0;
> int sys_support = 0;
> #endif
>
> +#if !(__GLIBC_PREREQ(2, 7))
> +#define CPU_FREE(ptr) free(ptr)
> +#endif
> +
> void cleanup(void);
> void setup(void);
> static inline int getcpu(unsigned int *, unsigned int *, void *);
> unsigned int set_cpu_affinity();
> unsigned int get_nodeid(unsigned int);
> -unsigned int max_cpuid(cpu_set_t *);
> +unsigned int max_cpuid(size_t, cpu_set_t *);
>
> char *TCID = "getcpu01";
> int TST_TOTAL = 1;
> @@ -189,18 +193,56 @@ void setup(void)
> unsigned int set_cpu_affinity()
> {
> unsigned cpu_max;
> - cpu_set_t set;
> - if (sched_getaffinity(0, sizeof(cpu_set_t), &set) < 0) {
> - tst_resm(TFAIL, "sched_getaffinity:errno:%d", errno);
> + cpu_set_t *set;
> + size_t size;
> + int nrcpus = 1024;
> +#if __GLIBC_PREREQ(2, 7)
> +realloc:
> + set = CPU_ALLOC(nrcpus);
> +#else
> + set = malloc(sizeof(cpu_set_t));
> +#endif
> + if (set == NULL) {
> + tst_resm(TFAIL, "CPU_ALLOC:errno:%d", errno);
> + tst_exit();
> + }
> +
> +#if __GLIBC_PREREQ(2, 7)
> + size = CPU_ALLOC_SIZE(nrcpus);
> + CPU_ZERO_S(size, set);
> +#else
> + size = sizeof(cpu_set_t);
> + CPU_ZERO(set);
> +#endif
> + if (sched_getaffinity(0, size, set) < 0) {
> + CPU_FREE(set);
> +#if __GLIBC_PREREQ(2, 7)
> + if (errno == EINVAL && nrcpus < (1024 << 8)) {
> + nrcpus = nrcpus << 2;
> + goto realloc;
> + }
> +#else
> + if (errno == EINVAL)
> + tst_resm(TFAIL, "NR_CPUS of the kernel is more than
> 1024, so we'd better use a newer glibc(>= 2.7)");
> + else
> +#endif
> + tst_resm(TFAIL, "sched_getaffinity:errno:%d", errno);
> tst_exit();
> }
> - cpu_max = max_cpuid(&set);
> - CPU_ZERO(&set);
> - CPU_SET(cpu_max, &set);
> - if (sched_setaffinity(0, sizeof(cpu_set_t), &set) < 0) {
> + cpu_max = max_cpuid(size, set);
> +#if __GLIBC_PREREQ(2, 7)
> + CPU_ZERO_S(size, set);
> + CPU_SET_S(cpu_max, size, set);
> +#else
> + CPU_ZERO(set);
> + CPU_SET(cpu_max, set);
> +#endif
> + if (sched_setaffinity(0, size, set) < 0) {
> + CPU_FREE(set);
> tst_resm(TFAIL, "sched_setaffinity:errno:%d", errno);
> tst_exit();
> }
> + CPU_FREE(set);
> return cpu_max;
> }
>
> @@ -208,11 +250,15 @@ unsigned int set_cpu_affinity()
> * Return the maximum cpu id
> */
> #define BITS_PER_BYTE 8
> -unsigned int max_cpuid(cpu_set_t * set)
> +unsigned int max_cpuid(size_t size, cpu_set_t * set)
> {
> unsigned int index, max = 0;
> - for (index = 0; index < sizeof(cpu_set_t) * BITS_PER_BYTE; index++)
> + for (index = 0; index < size * BITS_PER_BYTE; index++)
> +#if __GLIBC_PREREQ(2, 7)
> + if (CPU_ISSET_S(index, size, set))
> +#else
> if (CPU_ISSET(index, set))
> +#endif
> max = index;
> return max;
> }
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