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Message-Id: <20080817.005255.28108612.davem@davemloft.net> Date: Sun, 17 Aug 2008 00:52:55 -0700 (PDT) From: David Miller <davem@...emloft.net> To: torvalds@...ux-foundation.org Cc: adobriyan@...il.com, jirislaby@...il.com, akpm@...uxfoundation.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] De-macro spin_trylock_irq, spin_trylock_irqsave, write_trylock_irqsave From: Linus Torvalds <torvalds@...ux-foundation.org> Date: Sat, 16 Aug 2008 14:21:41 -0700 (PDT) > > > On Sun, 17 Aug 2008, Alexey Dobriyan wrote: > > > On Sat, Aug 16, 2008 at 03:31:00PM +0200, Jiri Slaby wrote: > > > > > > Doesn't this break on sparc -- is it tested there? > > > > What's so special about sparc? > > Sparc _used_ to save/restore the whole processor flags word with the irq > flags. That includes, iirc, things like the register window crap, so if > you did a save/restore flags in a function, it would get all that wrong > and things would blow up. > > However, I don't think sparc has actually done that for a _loong_ time > now, due to it always being problematic. We fixed it. Although I still sometimes consider saving and restoring cpu IRQ flags in different function contexts to be on the ugly side :) -- 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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