[email protected] wrote:
Audit/Cleanup of kernel_thread calls, specifically checking of return codes.
Problems seemed to fall into 3 main categories:
Thanks for doing this. Nitpick: this should be all one patch, or at most 3
patches (then each of the below 3 items would become individual changelogs).
Each patch should have a unique changelog, each should have a unique subject
(sans the sequence number).
cc'ing Andrew is also a good idea, if you want them to get merged ;)
One coding style comment:
if (...)
multi line
statement
Could use braces around the outermost if statement, for clarity.
1) callers of kernel_thread were inconsistent about meaning of a zero return
code. Some callers considered a zero return code to mean success, others took
it to mean failure. a zero return code, while not actually possible in the
current implementation, should be considered a success (pid 0 is/should be
valid). fixed all callers to treat zero return as success
2) caller of kernel_thread saved return code of kernel_thread for later use
without ever checking its value. Callers who did this tended to assume a
non-zero return was success, and would often wait for a completion queue to be
woken up, implying that an error (negative return code) from kernel_thread could
lead to deadlock. Repaired by checking return code at call time, and setting
saved return code to zero in the event of an error.
3) callers of kernel_thread never bothered to check the return code at all.
This can lead to seemingly unrelated errors later in execution. Fixed by
checking return code at call time and printing a warning message on failure.
--
SUSE Labs, Novell Inc.
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