On Sun, May 13, 2012 at 02:16:00PM +0200, Sam Ravnborg wrote: > Do we have any archs that does runtime patching of function calls? > > On sparc32 we have infrastructure to do so but this > requires an additional step after the final link > that I like to get rid of. > > Basically what is required is to locate all > call-sites that for example call: > > cache_flush_all(); > > and replace this with a > > srmmu_cache_flush_all(); > > sparc32 has ~30 calls that is eligble for runtime patching. > sparc-next has seen some nice cleanup in this area, > so your regular kernel has much more. > > We know early on the what to patch with as the only > paramters involved are platform and MMU type. > > I could try to come up with something myself - but if we already > have it somewhere maybe there is something to be inspired by. Just a follow-up to all. We decided to go for _ops structures for sparc32. In one case we do runtime patching where we replace the implementation depending on the platform. It it 2 times 3 instructions - so nothing big and fancy. Thanks for the feedback anyway! Sam -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
