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riscv: kasan: use local_tlb_flush_all() to avoid uninitialized __sbi_rfence 

It fails to boot the v5.8-rc4 kernel with CONFIG_KASAN because kasan_init
and kasan_early_init use uninitialized __sbi_rfence as executing the
tlb_flush_all(). Actually, at this moment, only the CPU which is
responsible for the system initialization enables the MMU. Other CPUs are
parking at the .Lsecondary_start. Hence the tlb_flush_all() is able to be
replaced by local_tlb_flush_all() to avoid using uninitialized
__sbi_rfence.

Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Vincent Chen 2020-07-10 10:40:54 +08:00 committed by Palmer Dabbelt
parent ba47d845d7
commit 4cb699d044
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 2 additions and 2 deletions
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4
arch/riscv/mm/kasan_init.c
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@ -44,7 +44,7 @@ asmlinkage void __init kasan_early_init(void)
(__pa(((uintptr_t) kasan_early_shadow_pmd))),
__pgprot(_PAGE_TABLE)));
flush_tlb_all();
local_flush_tlb_all();
}
static void __init populate(void *start, void *end)
@ -79,7 +79,7 @@ static void __init populate(void *start, void *end)
pfn_pgd(PFN_DOWN(__pa(&pmd[offset])),
__pgprot(_PAGE_TABLE)));
flush_tlb_all();
local_flush_tlb_all();
memset(start, 0, end - start);
}