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LoongArch: Flush TLB earlier at initialization

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Move local_flush_tlb_all() earlier (just after setup_ptwalker() and
before page allocation). This can avoid stale TLB entries misguiding
the later page allocation. Without this patch the second kernel of
kexec/kdump fails to boot SMP.

BTW, move output_pgtable_bits_defines() into tlb_init() since it has
nothing to do with tlb handler setup.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2022-10-12 16:36:08 +08:00
parent a522b7ad8e
commit 1299a129a9
1 changed files with 3 additions and 2 deletions
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5
arch/loongarch/mm/tlb.c
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@ -258,7 +258,7 @@ extern long exception_handlers[VECSIZE * 128 / sizeof(long)];
void setup_tlb_handler(int cpu)
{
setup_ptwalker();
output_pgtable_bits_defines();
local_flush_tlb_all();
/* The tlb handlers are generated only once */
if (cpu == 0) {
@ -301,6 +301,7 @@ void tlb_init(int cpu)
write_csr_pagesize(PS_DEFAULT_SIZE);
write_csr_stlbpgsize(PS_DEFAULT_SIZE);
write_csr_tlbrefill_pagesize(PS_DEFAULT_SIZE);
setup_tlb_handler(cpu);
local_flush_tlb_all();
output_pgtable_bits_defines();
}