Messages in this thread | | | Date | Fri, 14 Nov 2008 19:01:49 +0000 | From | Alan Cox <> | Subject | Re: [PATCH] Fix an uninitialised variable warning in the 8250 driver |
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On Fri, 14 Nov 2008 16:51:08 +0000 David Howells <dhowells@redhat.com> wrote:
> Alan Cox <alan@lxorguk.ukuu.org.uk> wrote: > > > Current versions of gcc that I've tested get this all correct just fine > > for x86 at least. > > gcc version 4.1.2 20070925 (Red Hat 4.1.2-33)
Newer gcc (4.3 and above) gets it right.
> x86_64 - which doesn't do that. It uses asm volatile and an infinite for-loop.
Which it seems 4.3 knows about
> Surely having BUG() retreat through a noreturn function may lose important > state, such as the function that issued the bug as the compiler is under no > requirement to save the return value, and the file/line info may not be > available.
Its arch specific code so arch specific things can be done.
Alan
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