@@ -203,10 +203,18 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
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);
}
This is a note to let you know that I have just added a patch titled arm64: Invalidate the TLB when replacing pmd entries during boot to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.11.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From e7d0a262642b86261240ea2e64f1e0f540e3a383 Mon Sep 17 00:00:00 2001 From: Catalin Marinas <catalin.marinas@arm.com> Date: Tue, 4 Feb 2014 16:01:31 +0000 Subject: arm64: Invalidate the TLB when replacing pmd entries during boot 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@redhat.com> Tested-by: Mark Salter <msalter@redhat.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- arch/arm64/mm/mmu.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) -- 1.8.3.2