linux-kernel - [PATCH v9 4/4] Revert "arm64: Enforce BBM for huge IO/VMAP mappings"

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Message-Id: <1525074094-25839-5-git-send-email-cpandya@codeaurora.org>
Date:   Mon, 30 Apr 2018 13:11:34 +0530
From:   Chintan Pandya <cpandya@...eaurora.org>
To:     Will Deacon <will.deacon@....com>, Arnd Bergmann <arnd@...db.de>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Philip Elcan <pelcan@...eaurora.org>,
        James Morse <james.morse@....com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Toshi Kani <toshi.kani@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, Chintan Pandya <cpandya@...eaurora.org>
Subject: [PATCH v9 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 0f651db..170009b 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -935,10 +935,6 @@ 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;
@@ -949,10 +945,6 @@ 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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