Messages in this thread Patch in this message | | | From | Victor Hassan <> | Subject | [PATCH] ARM: mmu: fix access to illegal address when using earlycon & memblock=debug | Date | Wed, 16 Mar 2022 10:33:56 +0800 |
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earlycon uses fixmap to create a memory map, So we need to close earlycon before closing fixmap, otherwise printk will access illegal addresses. After creating a new memory map, we open earlycon again.
Signed-off-by: Victor Hassan <victor@allwinnertech.com> --- arch/arm/mm/mmu.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 274e4f73fd33..f3511f07a7d0 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -14,6 +14,7 @@ #include <linux/fs.h> #include <linux/vmalloc.h> #include <linux/sizes.h> +#include <linux/console.h> #include <asm/cp15.h> #include <asm/cputype.h> @@ -1695,6 +1696,9 @@ static void __init early_fixmap_shutdown(void) pmd_clear(fixmap_pmd(va)); local_flush_tlb_kernel_page(va); +#ifdef CONFIG_FIX_EARLYCON_MEM + console_stop(console_drivers); +#endif for (i = 0; i < __end_of_permanent_fixed_addresses; i++) { pte_t *pte; struct map_desc map; @@ -1713,6 +1717,9 @@ static void __init early_fixmap_shutdown(void) create_mapping(&map); } +#ifdef CONFIG_FIX_EARLYCON_MEM + console_start(console_drivers); +#endif } /* -- 2.29.0
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