kernel.git/arch/riscv/kernel/smp.c, branch linux-4.17.y

RISC-V: Fixes for clean allmodconfig build

2017-12-01T21:31:31Z

Olaf said: Here's a short series of patches that produces a working allmodconfig. Would be nice to see them go in so we can add build coverage. I've dropped patches 8 and 10 from the original set: * [PATCH 08/10] (RISC-V: Set __ARCH_WANT_RENAMEAT to pick up generic version) has a better fix that I've sent out for review, we don't want renameat. * [PATCH 10/10] (input: joystick: riscv has get_cycles) has already been taken into Dmitry Torokhov's tree.

RISC-V: Flush I$ when making a dirty page executable

2017-11-30T20:58:25Z

The RISC-V ISA allows for instruction caches that are not coherent WRT stores, even on a single hart. As a result, we need to explicitly flush the instruction cache whenever marking a dirty page as executable in order to preserve the correct system behavior. Local instruction caches aren't that scary (our implementations actually flush the cache, but RISC-V is defined to allow higher-performance implementations to exist), but RISC-V defines no way to perform an instruction cache shootdown. When explicitly asked to do so we can shoot down remote instruction caches via an IPI, but this is a bit on the slow side. Instead of requiring an IPI to all harts whenever marking a page as executable, we simply flush the currently running harts. In order to maintain correct behavior, we additionally mark every other hart as needing a deferred instruction cache which will be taken before anything runs on it. Signed-off-by: Andrew Waterman Signed-off-by: Palmer Dabbelt

RISC-V: Provide stub of setup_profiling_timer()

2017-11-30T18:12:15Z

Fixes the following on allmodconfig build: profile.c:(.text+0x3e4): undefined reference to `setup_profiling_timer' Signed-off-by: Olof Johansson Signed-off-by: Palmer Dabbelt

RISC-V: Init and Halt Code

2017-09-26T22:26:44Z

This contains the various __init C functions, the initial assembly kernel entry point, and the code to reset the system. When a file was init-related this patch contains the entire file. Signed-off-by: Palmer Dabbelt