Le 14/12/2023 à 06:55, Nicholas Miehlbradt a écrit : > Word sized accesses may read uninitialized data when optimizing loads. > Disable this optimization when KMSAN is enabled to prevent false > positives. > > Signed-off-by: Nicholas Miehlbradt <nicho...@linux.ibm.com> > --- > arch/powerpc/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 6f105ee4f3cf..e33e3250c478 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -182,7 +182,7 @@ config PPC > select BUILDTIME_TABLE_SORT > select CLONE_BACKWARDS > select CPUMASK_OFFSTACK if NR_CPUS >= 8192 > - select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN > + select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN > && !KMSAN > select DMA_OPS_BYPASS if PPC64 > select DMA_OPS if PPC64 > select DYNAMIC_FTRACE if FUNCTION_TRACER
Seems like all archs do this. Maybe a better approach would be to define a HAVE_DCACHE_WORD_ACCESS that is selected by arches, and then the core part select DCACHE_WORD_ACCESS when HAVE_DCACHE_WORD_ACCESS && !KMSAN Christophe
