LoongArch: Flush TLB earlier at initialization

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>

diff --git a/arch/loongarch/mm/tlb.c b/arch/loongarch/mm/tlb.c
index 9818ce1..da3681f 100644 (file)
--- a/arch/loongarch/mm/tlb.c
+++ b/arch/loongarch/mm/tlb.c
@@ -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();
 }