4.20-stable review patch. If anyone has any objections, please let me know.
------------------ From: Catalin Marinas <[email protected]> commit 132fdc379eb143932d209a20fd581e1ce7630960 upstream. Commit 3b8c9f1cdfc5 ("arm64: IPI each CPU after invalidating the I-cache for kernel mappings") was aimed at fixing the I-cache invalidation for kernel mappings. However, it inadvertently caused all cache maintenance for user mappings via set_pte_at() -> __sync_icache_dcache() -> sync_icache_aliases() to call kick_all_cpus_sync(). Reported-by: Shijith Thotton <[email protected]> Tested-by: Shijith Thotton <[email protected]> Reported-by: Wandun Chen <[email protected]> Fixes: 3b8c9f1cdfc5 ("arm64: IPI each CPU after invalidating the I-cache for kernel mappings") Cc: <[email protected]> # 4.19.x- Signed-off-by: Catalin Marinas <[email protected]> Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/arm64/mm/flush.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -33,7 +33,11 @@ void sync_icache_aliases(void *kaddr, un __clean_dcache_area_pou(kaddr, len); __flush_icache_all(); } else { - flush_icache_range(addr, addr + len); + /* + * Don't issue kick_all_cpus_sync() after I-cache invalidation + * for user mappings. + */ + __flush_icache_range(addr, addr + len); } }
