Re: [PATCH] i386 uaccess to fixmap pages

H. Peter Anvin (hpa@zytor.com)
Sat, 10 May 2003 12:23:50 -0700

Jamie Lokier wrote:
>
> It doesn't need a PTE. The vsyscall code could be _copied_ to the end
> of the page at 0xbffff000, with the stack immediately preceding it.
>

You don't really want that, though. If you're doing gettimeofday() in
user space it's critically important that the kernel can modify all
these pages at once.

-hpa

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