linux-kernel - [PATCH v2 4/4] Revert "arm64: Enforce BBM for huge IO/VMAP mappings"

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Date:   Thu, 15 Mar 2018 18:15:06 +0530
From:   Chintan Pandya <cpandya@...eaurora.org>
To:     catalin.marinas@....com, will.deacon@....com, arnd@...db.de
Cc:     mark.rutland@....com, ard.biesheuvel@...aro.org,
        marc.zyngier@....com, james.morse@....com,
        kristina.martsenko@....com, takahiro.akashi@...aro.org,
        gregkh@...uxfoundation.org, tglx@...utronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, akpm@...ux-foundation.org,
        toshi.kani@....com, Chintan Pandya <cpandya@...eaurora.org>
Subject: [PATCH v2 4/4] Revert "arm64: Enforce BBM for huge IO/VMAP mappings"

This commit 15122ee2c515a ("arm64: Enforce BBM for huge
IO/VMAP mappings") is a temporary work-around until the
issues with CONFIG_HAVE_ARCH_HUGE_VMAP gets fixed.

Revert this change as we have fixes for the issue.

Signed-off-by: Chintan Pandya <cpandya@...eaurora.org>
---
 arch/arm64/mm/mmu.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 6f21a65..a1b8073 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -936,10 +936,6 @@ int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot)
 	pgprot_t sect_prot = __pgprot(PUD_TYPE_SECT |
 					pgprot_val(mk_sect_prot(prot)));
 
-	/* ioremap_page_range doesn't honour BBM */
-	if (pud_present(READ_ONCE(*pudp)))
-		return 0;
-
 	BUG_ON(phys & ~PUD_MASK);
 	set_pud(pudp, pfn_pud(__phys_to_pfn(phys), sect_prot));
 	return 1;
@@ -950,10 +946,6 @@ int pmd_set_huge(pmd_t *pmdp, phys_addr_t phys, pgprot_t prot)
 	pgprot_t sect_prot = __pgprot(PMD_TYPE_SECT |
 					pgprot_val(mk_sect_prot(prot)));
 
-	/* ioremap_page_range doesn't honour BBM */
-	if (pmd_present(READ_ONCE(*pmdp)))
-		return 0;
-
 	BUG_ON(phys & ~PMD_MASK);
 	set_pmd(pmdp, pfn_pmd(__phys_to_pfn(phys), sect_prot));
 	return 1;
-- 
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