diff options
| author | Ingo Molnar <mingo@kernel.org> | 2015-04-27 04:55:54 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 13:47:51 (GMT) |
| commit | 2fb29fc7c690d3d318471c42a62a05153d433cc1 (patch) | |
| tree | bf345add961eb205d8cca88ddc7a9363cd8c4e04 /arch/x86/kernel/fpu | |
| parent | e62bb3d894d312a37009fb07dc83fd1cc7bed37c (diff) | |
| download | linux-2fb29fc7c690d3d318471c42a62a05153d433cc1.tar.xz | |
x86/fpu: Simplify fpu__unlazy_stopped() error handling
Now that FPU contexts are always allocated, fpu__unlazy_stopped()
cannot fail. Remove its error return and propagate the changes to
the callers.
Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/fpu')
| -rw-r--r-- | arch/x86/kernel/fpu/core.c | 48 |
1 files changed, 13 insertions, 35 deletions
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index 45f014e..97b4f9e 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -296,24 +296,18 @@ EXPORT_SYMBOL_GPL(fpstate_init_curr); * the read-only case, it's not strictly necessary for * read-only access to the context. */ -static int fpu__unlazy_stopped(struct fpu *child_fpu) +static void fpu__unlazy_stopped(struct fpu *child_fpu) { - int ret; - - if (WARN_ON_ONCE(child_fpu == ¤t->thread.fpu)) - return -EINVAL; + WARN_ON_ONCE(child_fpu == ¤t->thread.fpu); if (child_fpu->fpstate_active) { child_fpu->last_cpu = -1; - return 0; - } - - fpstate_init(child_fpu); - - /* Safe to do for stopped child tasks: */ - child_fpu->fpstate_active = 1; + } else { + fpstate_init(child_fpu); - return 0; + /* Safe to do for stopped child tasks: */ + child_fpu->fpstate_active = 1; + } } /* @@ -389,15 +383,11 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset, void *kbuf, void __user *ubuf) { struct fpu *fpu = &target->thread.fpu; - int ret; if (!cpu_has_fxsr) return -ENODEV; - ret = fpu__unlazy_stopped(fpu); - if (ret) - return ret; - + fpu__unlazy_stopped(fpu); sanitize_i387_state(target); return user_regset_copyout(&pos, &count, &kbuf, &ubuf, @@ -414,10 +404,7 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset, if (!cpu_has_fxsr) return -ENODEV; - ret = fpu__unlazy_stopped(fpu); - if (ret) - return ret; - + fpu__unlazy_stopped(fpu); sanitize_i387_state(target); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, @@ -449,9 +436,7 @@ int xstateregs_get(struct task_struct *target, const struct user_regset *regset, if (!cpu_has_xsave) return -ENODEV; - ret = fpu__unlazy_stopped(fpu); - if (ret) - return ret; + fpu__unlazy_stopped(fpu); xsave = &fpu->state.xsave; @@ -480,9 +465,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset, if (!cpu_has_xsave) return -ENODEV; - ret = fpu__unlazy_stopped(fpu); - if (ret) - return ret; + fpu__unlazy_stopped(fpu); xsave = &fpu->state.xsave; @@ -643,11 +626,8 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset, { struct fpu *fpu = &target->thread.fpu; struct user_i387_ia32_struct env; - int ret; - ret = fpu__unlazy_stopped(fpu); - if (ret) - return ret; + fpu__unlazy_stopped(fpu); if (!static_cpu_has(X86_FEATURE_FPU)) return fpregs_soft_get(target, regset, pos, count, kbuf, ubuf); @@ -677,9 +657,7 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset, struct user_i387_ia32_struct env; int ret; - ret = fpu__unlazy_stopped(fpu); - if (ret) - return ret; + fpu__unlazy_stopped(fpu); sanitize_i387_state(target); |