From 7e66cbc93f876e24c2f8434cf011b94be242005e Mon Sep 17 00:00:00 2001 From: Konstantin Khlebnikov Date: Thu, 28 Aug 2014 12:49:36 +0100 Subject: [PATCH] ARM: 8132/1: LPAE: drop wrong carry flag correction after adding TTBR1_OFFSET ARM: LPAE: drop wrong carry flag correction after adding TTBR1_OFFSET In commit 7fb00c2fca4b6c58be521eb3676cf4b4ba8dde3b ("ARM: 8114/1: LPAE: load upper bits of early TTBR0/TTBR1") part which fixes carrying in adding TTBR1_OFFSET to TTRR1 was wrong: addls ttbr1, ttbr1, #TTBR1_OFFSET adcls tmp, tmp, #0 addls doesn't update flags, adcls adds carry from cmp above: cmp ttbr1, tmp @ PHYS_OFFSET > PAGE_OFFSET? Condition 'ls' means carry flag is clear or zero flag is set, thus only one case is affected: when PHYS_OFFSET == PAGE_OFFSET. It seems safer to remove this fixup. Bug is here for ages and nobody complained. Let's fix it separately. Reported-and-Tested-by: Jassi Brar Signed-off-by: Konstantin Khlebnikov Signed-off-by: Russell King --- arch/arm/mm/proc-v7-3level.S | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/arm/mm/proc-v7-3level.S b/arch/arm/mm/proc-v7-3level.S index 1a24e9232ec8..b64e67c7f176 100644 --- a/arch/arm/mm/proc-v7-3level.S +++ b/arch/arm/mm/proc-v7-3level.S @@ -146,7 +146,6 @@ ENDPROC(cpu_v7_set_pte_ext) mov \tmp, \ttbr1, lsr #(32 - ARCH_PGD_SHIFT) @ upper bits mov \ttbr1, \ttbr1, lsl #ARCH_PGD_SHIFT @ lower bits addls \ttbr1, \ttbr1, #TTBR1_OFFSET - adcls \tmp, \tmp, #0 mcrr p15, 1, \ttbr1, \tmp, c2 @ load TTBR1 mov \tmp, \ttbr0, lsr #(32 - ARCH_PGD_SHIFT) @ upper bits mov \ttbr0, \ttbr0, lsl #ARCH_PGD_SHIFT @ lower bits -- 2.20.1