On Jun 15, 2004, at 8:36 AM, Simon Weller wrote:
Signed-Off-By: Sergey Vlasov <vsu altlinux ru>
--- linux-2.6.6/include/asm-i386/i387.h.fp-lockup 2004-05-10 06:33:06
+0400
+++ linux-2.6.6/include/asm-i386/i387.h 2004-06-12 22:02:58 +0400
@@ -48,10 +48,17 @@
save_init_fpu( tsk ); \
} while (0)
+/*
+ * There might be some pending exceptions in the FP state at this point.
+ * However, it is too late to report them: this code is called
during .execve()
+ * (when the original executable is already gone) and during sigreturn()
(when
+ * the signal handler context is already lost). So just clear them to
prevent
+ * problems later.
+ */
#define __clear_fpu( tsk ) \
do { \
if ((tsk)->thread_info->status & TS_USEDFPU) { \
- asm volatile("fwait"); \
+ asm volatile("fnclex"); \
the patch quoted in this message is different than the one linus approved:
http://linux.bkbits.net:8080/linux-2.4/ gnupatch%4040cdf6f8V7sOe5n96HA5Q7r9uDRvJQ
#define clear_fpu( tsk ) do { \
if ( tsk->flags & PF_USEDFPU ) { \
- asm volatile("fwait"); \
+ asm volatile("fnclex ; fwait"); \
tsk->flags &= ~PF_USEDFPU; \
stts(); \
} \
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