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Date: Wed, 19 Nov 2014 12:12:18 -0500 (EST) From: Nicolas Pitre <nicolas.pitre@...aro.org> To: Russell King - ARM Linux <linux@....linux.org.uk> cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>, Konstantin Khlebnikov <koct9i@...il.com>, Arnd Bergmann <arnd@...db.de>, Andrey Ryabinin <a.ryabinin@...sung.com>, Konstantin Khlebnikov <k.khlebnikov@...sung.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH RFC] ARM: option for loading modules into vmalloc area On Wed, 19 Nov 2014, Russell King - ARM Linux wrote: > On Wed, Nov 19, 2014 at 11:57:15AM -0500, Nicolas Pitre wrote: > > On Wed, 19 Nov 2014, Russell King - ARM Linux wrote: > > > I don't think I ever did, because its pretty much impossible to do as I > > > explained in a follow up to this thread. > > > > > > We _used_ to do this with the userspace insmod methods, but since we got > > > this kernel-side linker, it's been pretty much impossible to do without > > > rewriting the module code. That's not going to happen on account of one > > > quirky architecture which Linus doesn't particularly like. > > > > Still... We could try adding a hook in the generic module linker code > > for a pre-relocation pass. Maybe only ARM would use it, but if the need > > to load big modules is real then I imagine Linus could be amenable to a > > compromise. > > So, how big a table would you allocate for the trampolines, based upon > not knowing anything about the module being loaded? 4K? 8K? 64K? The idea of a pre-relocation pass is to determine that. That could be something similar to calling apply_relocate() twice: once to determine the number of trampoline entries, and a second time to perform the actual relocation. Nicolas -- 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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