This is a note to let you know that I've just added the patch titled
arm64: Invalidate the TLB when replacing pmd entries during boot
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-invalidate-the-tlb-when-replacing-pmd-entries-during-boot.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a55f9929a9b257f84b6cc7b2397379cabd744a22 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@xxxxxxx>
Date: Tue, 4 Feb 2014 16:01:31 +0000
Subject: arm64: Invalidate the TLB when replacing pmd entries during boot
From: Catalin Marinas <catalin.marinas@xxxxxxx>
commit a55f9929a9b257f84b6cc7b2397379cabd744a22 upstream.
With the 64K page size configuration, __create_page_tables in head.S
maps enough memory to get started but using 64K pages rather than 512M
sections with a single pgd/pud/pmd entry pointing to a pte table.
create_mapping() may override the pgd/pud/pmd table entry with a block
(section) one if the RAM size is more than 512MB and aligned correctly.
For the end of this block to be accessible, the old TLB entry must be
invalidated.
Reported-by: Mark Salter <msalter@xxxxxxxxxx>
Tested-by: Mark Salter <msalter@xxxxxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/mmu.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -203,10 +203,18 @@ static void __init alloc_init_pmd(pud_t
do {
next = pmd_addr_end(addr, end);
/* try section mapping first */
- if (((addr | next | phys) & ~SECTION_MASK) == 0)
+ if (((addr | next | phys) & ~SECTION_MASK) == 0) {
+ pmd_t old_pmd =*pmd;
set_pmd(pmd, __pmd(phys | prot_sect_kernel));
- else
+ /*
+ * Check for previous table entries created during
+ * boot (__create_page_tables) and flush them.
+ */
+ if (!pmd_none(old_pmd))
+ flush_tlb_all();
+ } else {
alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys));
+ }
phys += next - addr;
} while (pmd++, addr = next, addr != end);
}
Patches currently in stable-queue which might be from catalin.marinas@xxxxxxx are
queue-3.12/arm64-vdso-fix-coarse-clock-handling.patch
queue-3.12/arm64-vdso-update-wtm-fields-for-clock_monotonic_coarse.patch
queue-3.12/arm64-add-dsb-after-icache-flush-in-__flush_icache_all.patch
queue-3.12/arm64-invalidate-the-tlb-when-replacing-pmd-entries-during-boot.patch
queue-3.12/arm64-vdso-prevent-ld-from-aligning-pt_load-segments-to-64k.patch
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