On Fri, 8 Apr 2011, Li Li wrote: > Dears, > > I cannot understand how TLS EMU ensure it's SMP safe, because get_tls > helper (at 0xffff0fe0) just read the value from 0xffff0ff0. But all > SMP cores should have the exact same mapping to the vectors page (at > 0xffff0000). So various threads running on different SMP cores at the > same time would get the same emulated TLS value (instead of thread > specific value set via set_tls). Could anybody explain this a little > bit? On SMP the hardware TLS register is always available, therefore the TLS value is not stored at 0xffff0ff0. The code actually installed at 0xffff0fe0 is modified at boot time by kuser_get_tls_init to select either the ldr or the mrc instruction to retrieve the TLS value. Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
