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MIPS and pci_alloc_consistent()?

Subject: MIPS and pci_alloc_consistent()?
From: Shuanglin Wang <>
Date: Tue, 09 Oct 2001 16:23:49 -0500
Organization: ATMEL MMC
I tried to use the pci_alloc_consistent() to allocate one-page  DMA'able memory for my device driver.  But, when booting up the system, it was always  failed to execute the pci_alloc_consistent() by showing some memory errors.

I traced the code to the function __alloc_page() in the file mm/page_alloc.c, and found the system called  "wakeup_kswapd()".  But at that time,  the kswapd process pointer is a NULL pointer and the wakeup-related codes don't check the pointer is NULL or not,  so the system was stopped because of dereferencing the null pointer.

I'm working on a MIPS SEAD-2 board using Linux kernel 2.4.3 MIPS distrinution.
Anybody has some ideas about the problem?  Or are there other convenient methods to allocate DMA'able memory?


Shuanglin Wang
Atmel Multimedia & Communications
3800 Gateway Centre, Suite 311
Morrisville, NC 27560
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