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x86: unify the implementation of FPU traps 

On 32 bits, we may suffer IRQ 13, or supposedly we might have a buggy
implementation which gives spurious trap 16.  We did not check for
this on 64 bits, but there is no reason we can't make the code the
same in both cases.  Furthermore, this is presumably rare, so do the
spurious check last, instead of first.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2008-12-25 10:39:01 -08:00
parent 1fcccb008b
commit a73ad3331f
1 changed files with 4 additions and 7 deletions
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11
arch/x86/kernel/traps.c
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@ -689,12 +689,7 @@ void math_error(void __user *ip)
cwd = get_fpu_cwd(task);
swd = get_fpu_swd(task);
err = swd & ~cwd & 0x3f;
#ifdef CONFIG_X86_32
if (!err)
return;
#endif
err = swd & ~cwd;
if (err & 0x001) { /* Invalid op */
/*
@ -712,7 +707,9 @@ void math_error(void __user *ip)
} else if (err & 0x020) { /* Precision */
info.si_code = FPE_FLTRES;
} else {
info.si_code = __SI_FAULT|SI_KERNEL; /* WTF? */
/* If we're using IRQ 13, or supposedly even some trap 16
implementations, it's possible we get a spurious trap... */
return; /* Spurious trap, no error */
}
force_sig_info(SIGFPE, &info, task);
}