Hi, On Wed, May 18, 2022 at 08:05:31PM +1000, Paul Mackerras wrote: > From: Daniel Axtens <d...@axtens.net> > > Implement a limited form of KASAN for Book3S 64-bit machines running under > the Radix MMU, supporting only outline mode. > > - Enable the compiler instrumentation to check addresses and maintain the > shadow region. (This is the guts of KASAN which we can easily reuse.) > > - Require kasan-vmalloc support to handle modules and anything else in > vmalloc space. > > - KASAN needs to be able to validate all pointer accesses, but we can't > instrument all kernel addresses - only linear map and vmalloc. On boot, > set up a single page of read-only shadow that marks all iomap and > vmemmap accesses as valid. > > - Document KASAN in powerpc docs. >
With this patch applied, powerpc:allmodconfig builds fail as follows. Building powerpc:allmodconfig ... failed -------------- Error log: Error: External symbol 'memset' referenced from prom_init.c make[3]: [arch/powerpc/kernel/Makefile:202: arch/powerpc/kernel/prom_init_check] Error 1 (ignored) powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o uses soft float powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn315/dcn315_resource.o uses soft float powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn315/dcn315_resource.o powerpc64-linux-ld: drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses hard float, drivers/gpu/drm/amd/amdgpu/../display/dc/dcn316/dcn316_resource.o uses soft float powerpc64-linux-ld: failed to merge target specific data of file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn316/dcn316_resource.o make[5]: [scripts/Makefile.build:435: drivers/gpu/drm/amd/amdgpu/amdgpu.o] Error 1 (ignored) make[2]: *** No rule to make target 'drivers/gpu/drm/amd/amdgpu/amdgpu.o', needed by 'modules-only.symvers'. Stop. make[1]: [Makefile:1753: modules] Error 2 (ignored) This is with gcc 11.3 and binutils 2.38. I also tried with gcc 11.2 and binutils 2.36.1, with the same results. Reverting this patch fixes the problem. Guenter
