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| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2006-03-31 02:30:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-31 12:18:52 -0800 |
| commit | 54d8d3b5a0ce1cdbad1d3154c9ea9732d394e9c7 (patch) | |
| tree | 129a29ab92fba7dc99229c87a38fe8df3ade7b15 /arch/um/sys-i386 | |
| parent | dd77aec07aec5cb81aed3b4ef79c1ff8bd0e2a68 (diff) | |
| download | linux-3.10-54d8d3b5a0ce1cdbad1d3154c9ea9732d394e9c7.tar.gz linux-3.10-54d8d3b5a0ce1cdbad1d3154c9ea9732d394e9c7.tar.bz2 linux-3.10-54d8d3b5a0ce1cdbad1d3154c9ea9732d394e9c7.zip | |
[PATCH] uml: add arch_switch_to for newly forked thread
Newly forked threads have no arch_switch_to_skas() called before their first
run, because when schedule() switches to them they're resumed in the body of
thread_wait() inside fork_handler() rather than in switch_threads() in
switch_to_skas(). Compensate this missing call.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/sys-i386')
| -rw-r--r-- | arch/um/sys-i386/ptrace.c | 9 | ||||
| -rw-r--r-- | arch/um/sys-i386/tls.c | 13 |
2 files changed, 18 insertions, 4 deletions
diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c index 6a23cc6947c..6028bc7cc01 100644 --- a/arch/um/sys-i386/ptrace.c +++ b/arch/um/sys-i386/ptrace.c @@ -23,7 +23,14 @@ void arch_switch_to_tt(struct task_struct *from, struct task_struct *to) void arch_switch_to_skas(struct task_struct *from, struct task_struct *to) { - arch_switch_tls_skas(from, to); + int err = arch_switch_tls_skas(from, to); + if (!err) + return; + + if (err != -EINVAL) + printk(KERN_WARNING "arch_switch_tls_skas failed, errno %d, not EINVAL\n", -err); + else + printk(KERN_WARNING "arch_switch_tls_skas failed, errno = EINVAL\n"); } int is_syscall(unsigned long addr) 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; } + |