Messages in this thread |  | | | Date | Thu, 29 Dec 2005 13:56:41 -0600 | | From | Matt Mackall <> | | Subject | Re: Fwd: [PATCH] Make sysenter support optional |
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On Wed, Dec 28, 2005 at 02:13:45PM -0800, Ulrich Drepper wrote: > > This adds configurable sysenter support on x86. This saves about 5k on > > small systems. > > You not only remove the sysenter support but also the vdso. And the > later is a very bad idea. It is already today basically impossible to > have reliable backtraces without the vdso and the unwind info it > contains for signal handlers. And things can only get worse in future. > The magic heuristics in the compiler are not reliable. It's simply the > wrong face, this in a interface between the kernel and the libc, the > compiler should not have such knowledge. > > The vdso should be mandatory for all configurations.
It's under CONFIG_EMBEDDED. Think uclibc. Think systems without interactive shells.
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