op 17-10-13 12:52, Peter Zijlstra schreef: > On Thu, Oct 17, 2013 at 07:45:29PM +0900, Tetsuo Handa wrote: >> Commit 040a0a37 "mutex: Add support for wound/wait style locks" used >> "!__builtin_constant_p(p == NULL)" but gcc 3.x cannot handle such expression >> correctly, leading to boot failure when built with CONFIG_DEBUG_MUTEXES=y. > So I completely forgot all about this, but wouldn't something like: > > !(__builtin_constant_p(p) && p == NULL) > > Not also work and generate the same code? > See earlier discussion. It was already answered why that was undesirable. ;)
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