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ARC: entry: replace 8 byte OR with 4 byte BSET
FAKE_RET_FROM_EXCEPTION drops down to pure kernel mode. It currently has an 8 byte instruction which can be replaced with 4 byte BSET This is applicable to both ARCv2 and ARCv3 entr code. ARCv2 current ------------ 00000804 <EV_Trap>: ... 874: 216a 1280 lr r9,[status32] 878: 2146 1809 bic r9,r9,0x20 87c: 2105 1f89 8000 0000 or r9,r9,0x80000000 ^^^^^^^^^ 884: 2029 8240 kflag r9 ARCv2 after ---------- 000007e0 <EV_Trap>: ... 850: 216a 1280 lr r9,[status32] 854: 2150 1149 bclr r9,r9,0x5 858: 214f 17c9 bset r9,r9,0x1f 85c: 2029 8240 kflag r9 Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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@ -274,8 +274,8 @@
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.macro FAKE_RET_FROM_EXCPN
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lr r9, [status32]
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bic r9, r9, STATUS_AE_MASK
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or r9, r9, STATUS_IE_MASK
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bclr r9, r9, STATUS_AE_BIT
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bset r9, r9, STATUS_IE_BIT
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kflag r9
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.endm
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