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Message-Id: <201104132150.05623.richard@nod.at> Date: Wed, 13 Apr 2011 21:50:05 +0200 From: Richard Weinberger <richard@....at> To: linux-kernel@...r.kernel.org Cc: user-mode-linux-devel@...ts.sourceforge.net Subject: gcc-4.6.0 generates no code for sub_preempt_count() Hi, I'm facing a very strange issue with gcc-4.6.0 and UML. Within __local_bh_enable() gcc generates no code for sub_preempt_count(). See: http://userweb.kernel.org/~rw/uml-gcc460/__local_bh_enable-gcc460.txt vs. http://userweb.kernel.org/~rw/uml-gcc460/__local_bh_enable-gcc431.txt Interestingly it generates code for add_preempt_count(). I can reproduce this on x86 and x86_64. The problem has to do with UML's current_thread_info() function. When I replace it with arch/x86's (unportable) variant gcc generates code. Any ideas whether this is a gcc or a kernel issue? Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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