On Tue, Mar 20, 2012 at 7:54 AM, Pritam Bankar <pritambankar1988@xxxxxxxxx> wrote: > Hi, > Cal anyone help me in understanding alternative.c file from Linux source > code. > I want to learn function apply_alternative. AFAIK this code applies better > replacement to instruction set used by processor. > But I am not sure what exactly it is doing ? if you add "debug-alternatives" to boot args, you'll see something like this. basically it patches the kernel, inserting locks and synchronization so that the kernel can run on SMP / multi-core arches. Once this is done, the other cores can be started. There are also some helpful comments in the code :-O apply_alternatives: alt table ffffffff81d546a8 -> ffffffff81d54ccc alternatives_smp_module_add: locks ffffffff81d57000 -> ffffffff81d5a000, text ffffffff81000000 -> ffffffff8149a3d2, name core kernel lockdep: fixing up alternatives. lockdep: fixing up alternatives. lockdep: fixing up alternatives. apply_alternatives: alt table ffffffff81a0363a -> ffffffff81a03652 alternatives_smp_module_add: locks ffffffffa001115c -> ffffffffa001117c, text ffffffffa000f000 -> ffffffffa0010ac0, name video alternatives_smp_module_add: locks ffffffffa002f530 -> ffffffffa002f598, text ffffffffa002c000 -> ffffffffa002efb4, name agpgart alternatives_smp_module_add: locks ffffffffa005b1a4 -> ffffffffa005b244, text ffffffffa0039000 -> ffffffffa004e508, name drm alternatives_smp_module_add: locks ffffffffa007f634 -> ffffffffa007f638, text ffffffffa007b000 -> ffffffffa007e6fc, name drm_kms_helper alternatives_smp_module_add: locks ffffffffa0091a84 -> ffffffffa0091abc, text ffffffffa0087000 -> ffffffffa008fab4, name ttm apply_alternatives: alt table ffffffffa011ca28 -> ffffffffa011ca40 alternatives_smp_module_add: locks ffffffffa011c8f8 -> ffffffffa011c974, text ffffffffa00a1000 -> ffffffffa010c104, name nouveau alternatives_smp_module_add: locks ffffffffa006fc14 -> ffffffffa006fc68, text ffffffffa006b000 -> ffffffffa006e340, name usb_storage alternatives_smp_module_add: locks ffffffffa013d45c -> ffffffffa013d474, text ffffffffa0138000 -> ffffffffa013c044, name autofs4 alternatives_smp_module_add: locks ffffffffa0177b38 -> ffffffffa0177c84, text ffffffffa0141000 -> ffffffffa0170380, name ipv6 alternatives_smp_module_add: locks ffffffffa000d294 -> ffffffffa000d2bc, text ffffffffa000c000 -> ffffffffa000d174, name uinput apply_alternatives: alt table ffffffffa01d7b77 -> ffffffffa01d7be3 alternatives_smp_module_add: locks ffffffffa01d491c -> ffffffffa01d4a00, text ffffffffa01a2000 -> ffffffffa01ccf6c, name kvm > > -- > > Pritam Bankar > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
