linux-kernel - [tip: x86/mm] x86/mm/64: Do not sync vmalloc/ioremap mappings

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Date:   Mon, 27 Jul 2020 12:46:20 -0000
From:   "tip-bot2 for Joerg Roedel" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Joerg Roedel <jroedel@...e.de>, Ingo Molnar <mingo@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/mm] x86/mm/64: Do not sync vmalloc/ioremap mappings

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     8bb9bf242d1fee925636353807c511d54fde8986
Gitweb:        https://git.kernel.org/tip/8bb9bf242d1fee925636353807c511d54fde8986
Author:        Joerg Roedel <jroedel@...e.de>
AuthorDate:    Tue, 21 Jul 2020 11:59:52 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Mon, 27 Jul 2020 12:32:29 +02:00

x86/mm/64: Do not sync vmalloc/ioremap mappings

Remove the code to sync the vmalloc and ioremap ranges for x86-64. The
page-table pages are all pre-allocated now so that synchronization is
no longer necessary.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Mike Rapoport <rppt@...ux.ibm.com>
Link: https://lore.kernel.org/r/20200721095953.6218-3-joro@8bytes.org
---
 arch/x86/include/asm/pgtable_64_types.h | 2 --
 arch/x86/mm/init_64.c                   | 5 -----
 2 files changed, 7 deletions(-)

diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 8f63efb..52e5f5f 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -159,6 +159,4 @@ extern unsigned int ptrs_per_p4d;
 
 #define PGD_KERNEL_START	((PAGE_SIZE / 2) / sizeof(pgd_t))
 
-#define ARCH_PAGE_TABLE_SYNC_MASK	(pgtable_l5_enabled() ?	PGTBL_PGD_MODIFIED : PGTBL_P4D_MODIFIED)
-
 #endif /* _ASM_X86_PGTABLE_64_DEFS_H */
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index e76bdb0..e0cd2df 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -217,11 +217,6 @@ void sync_global_pgds(unsigned long start, unsigned long end)
 		sync_global_pgds_l4(start, end);
 }
 
-void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
-{
-	sync_global_pgds(start, end);
-}
-
 /*
  * NOTE: This function is marked __ref because it calls __init function
  * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.