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[MIPS] Disallow CpU exception in kernel again.

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The commit 4d40bff7110e9e1a97ff8c01bdd6350e9867cc10 ("Allow CpU
exception in kernel partially") was broken.  The commit was to fix
theoretical problem but broke usual case.  Revert it for now.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto
2007-04-14 02:37:26 +09:00
committed by Ralf Baechle
parent 9a9943575a
commit 5323180db7
7 changed files with 21 additions and 57 deletions
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10
arch/mips/kernel/signal.c
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@@ -113,10 +113,10 @@ int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
* Save FPU state to signal context. Signal handler
* will "inherit" current FPU state.
*/
preempt_disable();
own_fpu(1);
enable_fp_in_kernel();
err |= save_fp_context(sc);
disable_fp_in_kernel();
preempt_enable();
}
return err;
}
@@ -148,7 +148,10 @@ check_and_restore_fp_context(struct sigcontext __user *sc)
err = sig = fpcsr_pending(&sc->sc_fpc_csr);
if (err > 0)
err = 0;
preempt_disable();
own_fpu(0);
err |= restore_fp_context(sc);
preempt_enable();
return err ?: sig;
}
@@ -187,11 +190,8 @@ int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
if (used_math) {
/* restore fpu context if we have used it before */
own_fpu(0);
enable_fp_in_kernel();
if (!err)
err = check_and_restore_fp_context(sc);
disable_fp_in_kernel();
} else {
/* signal handler may have used FPU. Give it up. */
lose_fpu(0);