linux-kernel - [PATCH] arm64: Add flush_cache_vmap call in __early_set

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Date:	Fri,  6 Jun 2014 11:29:50 +0100
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	msalter@...hat.com, catalin.marinas@....com, will.deacon@....com,
	steve.capper@...aro.org
Subject: [PATCH] arm64: Add flush_cache_vmap call in __early_set_fixmap

__early_set_fixmap does not do any synchronization when called to set a
fixmap entry. Add call to flush_vmap_cache().

Tested on hardware.

Signed-off-by: Leif Lindholm <leif.lindholm@...aro.org>
Tested-by: Graeme Gregory <graeme.gregory@...aro.org>
Cc: Steve Capper <steve.capper@...aro.org>
---
 arch/arm64/mm/ioremap.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index 7ec3283..5b8766c 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -176,9 +176,10 @@ void __init __early_set_fixmap(enum fixed_addresses idx,
 
 	pte = early_ioremap_pte(addr);
 
-	if (pgprot_val(flags))
+	if (pgprot_val(flags)) {
 		set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
-	else {
+		flush_cache_vmap(addr, addr + PAGE_SIZE);
+	} else {
 		pte_clear(&init_mm, addr, pte);
 		flush_tlb_kernel_range(addr, addr+PAGE_SIZE);
 	}
-- 
1.7.10.4

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