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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-05-07 12:09:52 -0700
committerThomas Gleixner <tglx@linutronix.de>2008-05-10 19:31:45 +0200
commitfd3c3ed5d1e3ceb37635cbe6d220ab94aae0781d (patch)
tree67cc2a950e670e5362173efd88ea6ded708b7e6c /include/asm-x86
parent0646153921892cc7a81320a6920beaca06b3e9f0 (diff)
downloadop-kernel-dev-fd3c3ed5d1e3ceb37635cbe6d220ab94aae0781d.zip
op-kernel-dev-fd3c3ed5d1e3ceb37635cbe6d220ab94aae0781d.tar.gz
x86: fix fpu restore from sig return
If the task never used fpu, initialize the fpu before restoring the FP state from the signal handler context. This will allocate the fpu state, if the task never needed it before. Reported-and-bisected-by: Eric Sesterhenn <snakebyte@gmx.de> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Tested-by: Eric Sesterhenn <snakebyte@gmx.de> Cc: Frederik Deweerdt <deweerdt@free.fr> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86')
-rw-r--r--include/asm-x86/i387.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/asm-x86/i387.h b/include/asm-x86/i387.h
index da2adb4..6b722d3 100644
--- a/include/asm-x86/i387.h
+++ b/include/asm-x86/i387.h
@@ -175,7 +175,15 @@ static inline int save_i387(struct _fpstate __user *buf)
*/
static inline int restore_i387(struct _fpstate __user *buf)
{
- set_used_math();
+ struct task_struct *tsk = current;
+ int err;
+
+ if (!used_math()) {
+ err = init_fpu(tsk);
+ if (err)
+ return err;
+ }
+
if (!(task_thread_info(current)->status & TS_USEDFPU)) {
clts();
task_thread_info(current)->status |= TS_USEDFPU;
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