[linux-next PATCH] arm64: fix kernel crash with 48-bit VA and 64KB granule

[Dennis Chen]

The commit 3400749b5a22 ("arm64/efi: refactor EFI init and runtime
code for reuse by 32-bit ARM") uses pgd_alloc() to allocate space for
efi_mm.pgd while not the static efi_pgd[], since this function will be
called with early_initcall, which results in the pgd_cache used by
pgd_alloc() has not been initialized yet, kernel will hang in this
case. This patch is trying to make the pgd_cache_init() called before
arm_enable_runtime_services() by changing its core_initcall to
early_initcall.

Signed-off-by: Dennis Chen <dennis.chen at arm.com>
Tested-by: Sudeep Holla <sudeep.holla at arm.com>

Cc: Will Deacon <will.deacon at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org>
Cc: Sudeep Holla <sudeep.holla at arm.com>
---
 arch/arm64/mm/pgd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/pgd.c b/arch/arm64/mm/pgd.c
index cb3ba1b..859a788 100644
--- a/arch/arm64/mm/pgd.c
+++ b/arch/arm64/mm/pgd.c
@@ -56,4 +56,4 @@ static int __init pgd_cache_init(void)
                                              SLAB_PANIC, NULL);
        return 0;
 }
-core_initcall(pgd_cache_init);
+early_initcall(pgd_cache_init);
--
1.9.1

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