Commit 1068cb52 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Catalin Marinas
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arm64/efi: Drop efi_rt_lock spinlock from EFI arch wrapper 



Since commit

  5894cf57 ("acpi/prmt: Use EFI runtime sandbox to invoke PRM handlers")

all EFI runtime calls on arm64 are routed via the EFI runtime wrappers,
which are serialized using the efi_runtime_lock semaphore.

This means the efi_rt_lock spinlock in the arm64 arch wrapper code has
become redundant, and can be dropped. For robustness, replace it with an
assert that the EFI runtime lock is in fact held by 'current'.

Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 7137a203

arch/arm64/kernel/efi.c

+1 −4
Original line number Diff line number Diff line
@@ -165,19 +165,16 @@ asmlinkage efi_status_t efi_handle_corrupted_x18(efi_status_t s, const char *f) 
	return s;

}



static DEFINE_RAW_SPINLOCK(efi_rt_lock);



void arch_efi_call_virt_setup(void)

{

	efi_runtime_assert_lock_held();

	efi_virtmap_load();

	raw_spin_lock(&efi_rt_lock);

	__efi_fpsimd_begin();

}



void arch_efi_call_virt_teardown(void)

{

	__efi_fpsimd_end();

	raw_spin_unlock(&efi_rt_lock);

	efi_virtmap_unload();

}