is pci_alloc_consistent() really consistent on a pentium?

William Chow (lilbilchow@yahoo.com)
Thu, 30 May 2002 13:44:06 -0700 (PDT)


If IA32 builds use the i386 version of
pci_alloc_consistent(), how is the memory provided by
this function really write-thru (on a pentium) since
it appears to only set up the default mapping
(PCD/PWT==0)? In contrast, pgprot_noncached() and
pci_mmap_page_range() explicitly set these bits on a
pentium (i.e. when boot_cpu_data.x86 > 3). Or am I
missing something?

Please CC me on the response.

- William Chow

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