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Commit b3bf6aa7 authored by Catalin Marinas's avatar Catalin Marinas
Browse files

arm64: Unmask asynchronous aborts when in kernel mode 



The asynchronous aborts are generally fatal for the kernel but they can
be masked via the pstate A bit. If a system error happens while in
kernel mode, it won't be visible until returning to user space. This
patch enables this kind of abort early to help identifying the cause.

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent df503ba7

arch/arm64/include/asm/irqflags.h

+3 −0
Original line number Diff line number Diff line
@@ -56,6 +56,9 @@ static inline void arch_local_irq_disable(void) 
#define local_fiq_enable()	asm("msr	daifclr, #1" : : : "memory")

#define local_fiq_disable()	asm("msr	daifset, #1" : : : "memory")



#define local_async_enable()	asm("msr	daifclr, #4" : : : "memory")

#define local_async_disable()	asm("msr	daifset, #4" : : : "memory")



/*

 * Save the current interrupt enable state.

 */

arch/arm64/kernel/setup.c

+5 −0
Original line number Diff line number Diff line
@@ -205,6 +205,11 @@ u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; 


void __init setup_arch(char **cmdline_p)

{

	/*

	 * Unmask asynchronous aborts early to catch possible system errors.

	 */

	local_async_enable();



	setup_processor();



	setup_machine_fdt(__fdt_pointer);

arch/arm64/kernel/smp.c

+1 −0
Original line number Diff line number Diff line
@@ -160,6 +160,7 @@ asmlinkage void secondary_start_kernel(void) 


	local_irq_enable();

	local_fiq_enable();

	local_async_enable();



	/*

	 * OK, it's off to the idle thread for us