Messages in this thread Patch in this message | | | Date | Tue, 30 Jan 2001 16:08:32 -0800 | From | Christopher Neufeld <> | Subject | Request: increase in PCI bus limit |
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Hello,
I'm working at a customer site with custom hardware. The 2.4.0 series kernel almost works out of the box, but the machine has 52 PCI busses. Plans are to produce a 4-way box which would have over 80 PCI busses. The file include/asm-i386/mpspec.h allocates space for 32 busses in the definition of the macro MAX_MP_BUSSES. When 52 busses are probed, some arrays are filled out past their ends (there is no bounds checking performed on the array filling), and the kernel oopses out. The only patch which has to be applied to make Linux run stably on these systems is to increase that limit. Would it be possible to bump it up to 128, or even 256, in later 2.4.* kernel releases? That would allow this customer to work with an unpatched kernel, at the cost of an additional 3.5 kB of variables in the kernel.
Thank you for any help. For completeness, here's the patch (against 2.4.0):
--- linux-2.4.0/include/asm-i386/mpspec.h.orig Tue Jan 30 16:06:08 2001 +++ linux-2.4.0/include/asm-i386/mpspec.h Tue Jan 30 16:06:21 2001 @@ -157,7 +157,7 @@ */ #define MAX_IRQ_SOURCES 128 -#define MAX_MP_BUSSES 32 +#define MAX_MP_BUSSES 256 enum mp_bustype { MP_BUS_ISA = 1, MP_BUS_EISA,
-- Christopher Neufeld neufeld@linuxcare.com Home page: http://caliban.physics.utoronto.ca/neufeld/Intro.html "Don't edit reality for the sake of simplicity" - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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