AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/arm64/mm
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Chintan Pandya 785a19f9d1 ioremap: Update pgtable free interfaces with addr 
The following kernel panic was observed on ARM64 platform due to a stale
TLB entry.

 1. ioremap with 4K size, a valid pte page table is set.
 2. iounmap it, its pte entry is set to 0.
 3. ioremap the same address with 2M size, update its pmd entry with
    a new value.
 4. CPU may hit an exception because the old pmd entry is still in TLB,
    which leads to a kernel panic.

Commit b6bdb7517c ("mm/vmalloc: add interfaces to free unmapped page
table") has addressed this panic by falling to pte mappings in the above
case on ARM64.

To support pmd mappings in all cases, TLB purge needs to be performed
in this case on ARM64.

Add a new arg, 'addr', to pud_free_pmd_page() and pmd_free_pte_page()
so that TLB purge can be added later in seprate patches.

[toshi.kani@hpe.com: merge changes, rewrite patch description]
Fixes: 28ee90fe60 ("x86/mm: implement free pmd/pte page interfaces")
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: mhocko@suse.com
Cc: akpm@linux-foundation.org
Cc: hpa@zytor.com
Cc: linux-mm@kvack.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: Will Deacon <will.deacon@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: stable@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20180627141348.21777-3-toshi.kani@hpe.com
2018-07-04 21:37:08 +02:00
..
cache.S arm64: Add support for new control bits CTR_EL0.DIC and CTR_EL0.IDC 2018-03-09 13:57:57 +00:00
context.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
copypage.c
dma-mapping.c arm64: dma-mapping: clear buffers allocated with FORCE_CONTIGUOUS flag 2018-06-19 14:19:21 +01:00
dump.c arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables 2018-02-16 18:13:57 +00:00
extable.c
fault.c arm64 updates for 4.18: 2018-06-08 11:10:58 -07:00
flush.c arm64: mm: drop addr parameter from sync icache and dcache 2018-04-24 09:23:00 +01:00
hugetlbpage.c arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables 2018-02-16 18:13:57 +00:00
init.c treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX 2018-06-15 07:55:25 +09:00
ioremap.c
kasan_init.c arm64: kasan: avoid pfn_to_nid() before page array is initialized 2018-04-17 16:16:59 +01:00
Makefile
mmap.c exec: pass stack rlimit into mm layout functions 2018-04-11 10:28:37 -07:00
mmu.c ioremap: Update pgtable free interfaces with addr 2018-07-04 21:37:08 +02:00
numa.c
pageattr.c arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables 2018-02-16 18:13:57 +00:00
pgd.c arm64: handle 52-bit addresses in TTBR 2017-12-22 17:35:21 +00:00
physaddr.c
proc.S arm64: mm: Ensure writes to swapper are ordered wrt subsequent cache maintenance 2018-06-22 17:23:40 +01:00
ptdump_debugfs.c