On 07/22/2014 11:24 AM, Li Wang wrote:
> Hi all,
>
> LTP failed with mmap into high region on s390x:
>
> hugemmap03 0 TINFO : set nr_hugepages to 64
> hugemmap03 1 TFAIL : mmap into high region succeeded unexpectedly
> hugemmap03 0 TINFO : set nr_hugepages to 0
> hugemmap03 0 TWARN : tst_rmdir: rmobj(/tmp/hugOr8owE) failed:
> remove(/tmp/hugOr8owE) failed; errno=16: Device or resource busy
>
>
> According to the test case, the failing code is:
>
> 103 /* Attempt to mmap into highmem addr, should get ENOMEM */
> 104 addr = mmap(HIGH_ADDR, map_sz, PROT_READ,
> 105 MAP_SHARED | MAP_FIXED, fildes, 0);
> 106 if (addr != MAP_FAILED) {
> 107 tst_resm(TFAIL, "mmap into high region "
> 108 "succeeded unexpectedly");
> 109 goto fail;
> 110 }
>
> with HIGH_ADDR defined as:
>
> #define HIGH_ADDR (void *)(0x1000000000000)
>
> This is an 2^48 address... which is likely the maximum for amd64. On
> s390x, the address space is up to 2^53. So the mmap() in the test case
> succeeds which is not expected.
>
>
> ---------------------------------------------
>
> after increase the HIGH_ADDR value, test PASS.
>
> [root@ibm-z10-38 hugemmap]# cat hugemmap03.c |grep HIGH
> #define HIGH_ADDR (void *)(0x100000000000000) <----increase the value
> addr = mmap(HIGH_ADDR, map_sz, PROT_READ,
>
>
> [root@ibm-z10-38 hugemmap]# ./hugemmap03 -s 1024
> hugemmap03 0 TINFO : set nr_hugepages to 1024
> hugemmap03 1 TPASS : mmap into high region failed as expected:
> errno=ENOMEM(12): Cannot allocate memory
> hugemmap03 0 TINFO : set nr_hugepages to 0
>
>
>
>
Looks good to me. Could you please make a patch for it?
Thanks,
Caspar
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