i386: convert hardware exception 7 to an interrupt gate

Handle no coprocessor exception with interrupt initially off.

device_not_available in entry_32.S calls either math_state_restore
or math_emulate. This patch adds an extra indirection to be
able to re-enable interrupts explicitly in traps_32.c

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 109792b..5a88585 100644 (file)
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -760,20 +760,9 @@ ENTRY(device_not_available)
        RING0_INT_FRAME
        pushl $-1                       # mark this as an int
        CFI_ADJUST_CFA_OFFSET 4
-       SAVE_ALL
-       GET_CR0_INTO_EAX
-       testl $0x4, %eax                # EM (math emulation bit)
-       jne device_not_available_emulate
-       preempt_stop(CLBR_ANY)
-       call math_state_restore
-       jmp ret_from_exception
-device_not_available_emulate:
-       pushl $0                        # temporary storage for ORIG_EIP
+       pushl $do_device_not_available
        CFI_ADJUST_CFA_OFFSET 4
-       call math_emulate
-       addl $4, %esp
-       CFI_ADJUST_CFA_OFFSET -4
-       jmp ret_from_exception
+       jmp error_code
        CFI_ENDPROC
 END(device_not_available)
 

diff --cc arch/x86/kernel/traps_32.c
Simple merge