[Bug 1100] New: Linus: ia64 pipe test behavior is broken

For Linux kernels 2.6.10 and greater, on ia64, when the configured page size is
not 4K, the following tests fail:

/tset/ANSI.os/streamio/fwrite/T.fwrite 3 UNRESOLVED
/tset/LSB.os/ioprim/writev_L/T.writev_L 13 FAIL
/tset/POSIX.os/ioprim/write/T.write 13 FAIL

The problem is that, on systems where Linux's PAGE_SIZE > POSIX's PIPE_BUF, a
read of PIPE_BUF bytes is not sufficient to cause a full pipe to unblock.  All
three tests above assume that a PIPE_BUF read is always sufficient.

I wrote and submitted a patch that would fix this problem, but it appears to
have been rejected.  Linus believes that the precise amount that must be read
from the pipe to unblock it is not specified by POSIX/SUS, and that any code
depending on a specific number is broken.

My message to lkml is in the URL, and contains the patch.  Linus's replies are
in the thread.   
 
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