diff options
Diffstat (limited to 'arch/um/sys-i386/tls.c')
| -rw-r--r-- | arch/um/sys-i386/tls.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/um/sys-i386/tls.c b/arch/um/sys-i386/tls.c index e3c5bc593fa..2251654c6b4 100644 --- a/arch/um/sys-i386/tls.c +++ b/arch/um/sys-i386/tls.c @@ -70,8 +70,6 @@ static int get_free_idx(struct task_struct* task) return -ESRCH; } -#define O_FORCE 1 - static inline void clear_user_desc(struct user_desc* info) { /* Postcondition: LDT_empty(info) returns true. */ @@ -84,6 +82,8 @@ static inline void clear_user_desc(struct user_desc* info) info->seg_not_present = 1; } +#define O_FORCE 1 + static int load_TLS(int flags, struct task_struct *to) { int ret = 0; @@ -162,7 +162,13 @@ void clear_flushed_tls(struct task_struct *task) * SKAS patch. */ int arch_switch_tls_skas(struct task_struct *from, struct task_struct *to) { - return load_TLS(O_FORCE, to); + /* We have no need whatsoever to switch TLS for kernel threads; beyond + * that, that would also result in us calling os_set_thread_area with + * userspace_pid[cpu] == 0, which gives an error. */ + if (likely(to->mm)) + return load_TLS(O_FORCE, to); + + return 0; } int arch_switch_tls_tt(struct task_struct *from, struct task_struct *to) @@ -324,3 +330,4 @@ int ptrace_get_thread_area(struct task_struct *child, int idx, out: return ret; } + |