LTP test mmap01 fails on sparc with:
mmap01 1 FAIL : mmap() Failed on mmapfile, errno=22
because the address passed in is only page aligned:
/*
* Initialize addr to align with the first page boundary above the
* break address of the process.
*/
addr = (void *) (((intptr_t)sbrk(0) + (page_sz - 1)) & ~(page_sz - 1));
...
addr = mmap(addr, page_sz, PROT_READ | PROT_WRITE,
MAP_FILE|MAP_SHARED|MAP_FIXED, fildes, 0);
The address should be aligned to the value of SHMLBA as defined in
asm/shmparam.h.
See Documentation/cachetlb.txt for the explanation behind this.
For most architectures this value is the page size, but not all.
Unfortunately asm/shmparam.h is not suitable for inclusion in user space
programs. I looked at sysconf(LEVEL1_DCACHE_SIZE), but that returns 0 on
sparc.
Is there another solution other than hardcoding the exceptions in
architecture specific code?
Thanks,
Martin
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