From: Roman Zippel Date: Tue, 31 May 2005 21:39:29 +0000 (-0700) Subject: [PATCH] flush icache in correct context X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ae92ef8a442421356950a0a8dfdc35e8e783000e;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [PATCH] flush icache in correct context flush_icache_range() is used in two different situation - in binfmt_elf.c & co for user space mappings and module.c for kernel modules. On m68k flush_icache_range() doesn't know which data to flush, as it has separate address spaces and the pointer argument can be valid in either address space. First I considered splitting flush_icache_range(), but this patch is simpler. Setting the correct context gives flush_icache_range() enough information to flush the correct data. Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/module.c b/kernel/module.c index 5734ab09d3f9..83b3d376708c 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -1758,6 +1758,7 @@ sys_init_module(void __user *umod, const char __user *uargs) { struct module *mod; + mm_segment_t old_fs = get_fs(); int ret = 0; /* Must have permission */ @@ -1775,6 +1776,9 @@ sys_init_module(void __user *umod, return PTR_ERR(mod); } + /* flush the icache in correct context */ + set_fs(KERNEL_DS); + /* Flush the instruction cache, since we've played with text */ if (mod->module_init) flush_icache_range((unsigned long)mod->module_init, @@ -1783,6 +1787,8 @@ sys_init_module(void __user *umod, flush_icache_range((unsigned long)mod->module_core, (unsigned long)mod->module_core + mod->core_size); + set_fs(old_fs); + /* Now sew it into the lists. They won't access us, since strong_try_module_get() will fail. */ stop_machine_run(__link_module, mod, NR_CPUS);