Commit-ID: b85e67d1483c72b77d1bdc265aa8ba91590794c1
Gitweb: http://git.kernel.org/tip/b85e67d1483c72b77d1bdc265aa8ba91590794c1
Author: Borislav Petkov <bp@xxxxxxx>
AuthorDate: Mon, 16 Mar 2015 10:21:55 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 23 Mar 2015 10:13:59 +0100
x86/fpu: Rename drop_init_fpu() to fpu_reset_state()
Call it what it does and in accordance with the context where it is
used: we reset the FPU state either because we were unable to restore it
from the one saved in the task or because we simply want to reset it.
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Acked-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/include/asm/fpu-internal.h | 8 ++++++--
arch/x86/kernel/i387.c | 2 +-
arch/x86/kernel/signal.c | 2 +-
arch/x86/kernel/traps.c | 2 +-
arch/x86/kernel/xsave.c | 4 ++--
5 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 2d4adff..da5e967 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -406,7 +406,11 @@ static inline void restore_init_xstate(void)
fxrstor_checking(&init_xstate_buf->i387);
}
-static inline void drop_init_fpu(struct task_struct *tsk)
+/*
+ * Reset the FPU state in the eager case and drop it in the lazy case (later use
+ * will reinit it).
+ */
+static inline void fpu_reset_state(struct task_struct *tsk)
{
if (!use_eager_fpu())
drop_fpu(tsk);
@@ -480,7 +484,7 @@ static inline void switch_fpu_finish(struct task_struct *new, fpu_switch_t fpu)
{
if (fpu.preload) {
if (unlikely(restore_fpu_checking(new)))
- drop_init_fpu(new);
+ fpu_reset_state(new);
}
}
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 29e982a..41575b9 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -108,7 +108,7 @@ void __kernel_fpu_end(void)
if (__thread_has_fpu(me)) {
if (WARN_ON(restore_fpu_checking(me)))
- drop_init_fpu(me);
+ fpu_reset_state(me);
} else if (!use_eager_fpu()) {
stts();
}
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index e504246..59eaae6 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -679,7 +679,7 @@ handle_signal(struct ksignal *ksig, struct pt_regs *regs)
* Ensure the signal handler starts with the new fpu state.
*/
if (used_math())
- drop_init_fpu(current);
+ fpu_reset_state(current);
}
signal_setup_done(failed, ksig, test_thread_flag(TIF_SINGLESTEP));
}
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 7ee7369..edf66c0 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -863,7 +863,7 @@ void math_state_restore(void)
kernel_fpu_disable();
__thread_fpu_begin(tsk);
if (unlikely(restore_fpu_checking(tsk))) {
- drop_init_fpu(tsk);
+ fpu_reset_state(tsk);
force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk);
} else {
tsk->thread.fpu_counter++;
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 0bf82c5..65c29b0 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -342,7 +342,7 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
config_enabled(CONFIG_IA32_EMULATION));
if (!buf) {
- drop_init_fpu(tsk);
+ fpu_reset_state(tsk);
return 0;
}
@@ -416,7 +416,7 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
*/
user_fpu_begin();
if (restore_user_xstate(buf_fx, xstate_bv, fx_only)) {
- drop_init_fpu(tsk);
+ fpu_reset_state(tsk);
return -1;
}
}
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