On Mon, 7 Mar 2016 11:41:37 -0500 (EST) Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > It's hard to call this a compiler bug, but perhaps it is -- I don't > know how programmers are supposed to tell CLANG that a subroutine > modifies the Interrupt Flag in a way that the compiler shouldn't mess > up. I would state that this is a compiler bug for any kernel development. Because it's modifying a global variable (IF) that can be modified by asm(). Clang is assuming that this is userspace where IF can't change. But because this is kernel space, the IF can (and does here), which makes this "feature" incompatible with any (Linux or otherwise) kernel programming. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
