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riscv: Add sfence.vma after early page table changes 

[ Upstream commit 21190b74bc ]

This invalidates local TLB after modifying the page tables during early init as
it's too early to handle suprious faults as we otherwise do.

Fixes: f2c17aabc9 ("RISC-V: Implement compile-time fixed mappings")
Reported-by: Syven Wang <syven.wang@sifive.com>
Signed-off-by: Syven Wang <syven.wang@sifive.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
[Palmer: Cleaned up the commit text]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Greentime Hu 2020-08-04 11:02:05 +08:00 committed by Greg Kroah-Hartman
parent 8a568d7fc2
commit daf646fd32
1 changed files with 3 additions and 4 deletions
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7
arch/riscv/mm/init.c
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@ -167,12 +167,11 @@ void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
ptep = &fixmap_pte[pte_index(addr)];
if (pgprot_val(prot)) {
if (pgprot_val(prot))
set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
} else {
else
pte_clear(&init_mm, addr, ptep);
local_flush_tlb_page(addr);
}
local_flush_tlb_page(addr);
}
static pte_t *__init get_pte_virt(phys_addr_t pa)