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Message-ID: <5026482.P9PDy29y2Y@wuerfel> Date: Tue, 13 May 2014 10:43:06 +0200 From: Arnd Bergmann <arnd@...db.de> To: Richard Lee <superlibj8301@...il.com> Cc: linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Richard Lee <superlibj@...il.com> Subject: Re: [RFC][PATCH 2/2] ARM: ioremap: Add IO mapping space reused support. On Tuesday 13 May 2014 09:45:08 Richard Lee wrote: > > On Mon, May 12, 2014 at 3:51 PM, Arnd Bergmann <arnd@...db.de> wrote: > > On Monday 12 May 2014 10:19:55 Richard Lee wrote: > >> For the IO mapping, for the same physical address space maybe > >> mapped more than one time, for example, in some SoCs: > >> 0x20000000 ~ 0x20001000: are global control IO physical map, > >> and this range space will be used by many drivers. > >> And then if each driver will do the same ioremap operation, we > >> will waste to much malloc virtual spaces. > >> > >> This patch add IO mapping space reused support. > >> > >> Signed-off-by: Richard Lee <superlibj@...il.com> > > > > What happens if the first driver then unmaps the area? > > > > If the first driver will unmap the area, it shouldn't do any thing > except decreasing the 'used' counter. Ah, for some reason I didn't see your first patch that introduces that counter. Arnd -- 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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