linux-kernel - [PATCH v2 0/3] x86/mm/64: Remove vmalloc/ioremap pgtable synchronization

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Date:   Wed,  1 Jul 2020 10:38:35 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     x86@...nel.org
Cc:     hpa@...or.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>, joro@...tes.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v2 0/3] x86/mm/64: Remove vmalloc/ioremap pgtable synchronization

Hi,

here is a small patch-set to implement pre-allocation of the P4D/PUD
pages in the vmalloc/ioremap area of the address space. This allows to
remove the synchronization of these mappings for x86-64 and unexporting
the sync_global_pgds() function.

Please review.

Thanks,

	Joerg

Changes to v1:

	- Made failure at pre-allocation stage fatal
	- As a consequence removed the arch_sync_kernel_mappings()
	  implementation for x86-64
	- Unexported sync_global_pgds()
	- Removed some left-over debug code from the first patch

Joerg Roedel (3):
  x86/mm/64: Pre-allocate p4d/pud pages for vmalloc area
  x86/mm/64: Do not sync vmalloc/ioremap mappings
  x86/mm/64: Make sync_global_pgds() static

 arch/x86/include/asm/pgtable_64.h       |  2 -
 arch/x86/include/asm/pgtable_64_types.h |  2 -
 arch/x86/mm/init_64.c                   | 59 ++++++++++++++++++++++---
 3 files changed, 53 insertions(+), 10 deletions(-)

-- 
2.17.1