Re: [patch 18/39] remap_file_pages protection support: add VM_FAULT_SIGSEGV

Blaisorblade
2005-08-26T15:28:38Z

On Monday 15 August 2005 12:15, Russell King wrote:
> On Mon, Aug 15, 2005 at 08:12:54PM +1000, Nick Piggin wrote:
> > Well there is now, and that is we are now using a bit in the 2nd
> > byte as flags. So I had to do away with -ve numbers there entirely.

> > You could achieve a similar thing by using another bit in that byte
> > #define VM_FAULT_FAILED 0x20
> > and make that bit present in VM_FAULT_OOM and VM_FAULT_SIGBUS, then
> > do an unlikely test for that bit in your handler and branch away to
> > the slow path.

> That'll do as well, thanks.
Note that what Nick said is about mainline kernels, not only my brave patch.

Currently Linus fixed up ARM26 by disabling the optimization: see git commit
6e346228c76506e07e297744a28464022c6806ad.
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

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