[lkml]   [2001]   [Jun]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Missing cache flush.
Date said:
> > I was pointed at Documentation/DMA-mapping.txt but that doesn't seem
> > very helpful - it's very PCI-specific, and a quick perusal of
> > pci_dma_sync() on i386 shows that it doesn't do what's required anyway.

> What should it do on i386? mb()?

For it to have any use in the situation I described, it would need to
writeback and invalidate the dcache for the affected range. It doesn't seem
to do so, so it seems that it isn't what I require.

The situation is simple - I have a paged RAM setup and I need it cached.
All I want to do is flush and invalidate the cache when I'm about to waggle
whatever I/O ports I waggle to change pages.

There are other situations in which I need the cache flushed, but the above
is one of the simplest.

Even flush_page_to_ram() doesn't seem to do what its name implies, on most


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:54    [W:3.910 / U:1.160 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site