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Commit 10cd706d authored by Peter Zijlstra's avatar Peter Zijlstra
Browse files

lockdep: x86_64: connect the sysexit hook 



Run the lockdep_sys_exit hook after all other C code on the syscall
return path.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent c7e872e7

arch/x86/kernel/entry_64.S

+11 −12
Original line number Diff line number Diff line
@@ -244,6 +244,7 @@ ret_from_sys_call: 
	movl $_TIF_ALLWORK_MASK,%edi

	/* edi:	flagmask */

sysret_check:		

	LOCKDEP_SYS_EXIT

	GET_THREAD_INFO(%rcx)

	cli

	TRACE_IRQS_OFF
@@ -333,6 +334,7 @@ int_ret_from_sys_call: 
	movl $_TIF_ALLWORK_MASK,%edi

	/* edi:	mask to check */

int_with_check:

	LOCKDEP_SYS_EXIT_IRQ

	GET_THREAD_INFO(%rcx)

	movl threadinfo_flags(%rcx),%edx

	andl %edi,%edx
@@ -544,11 +546,13 @@ exit_intr: 
retint_with_reschedule:

	movl $_TIF_WORK_MASK,%edi

retint_check:

	LOCKDEP_SYS_EXIT_IRQ

	movl threadinfo_flags(%rcx),%edx

	andl %edi,%edx

	CFI_REMEMBER_STATE

	jnz  retint_careful

retint_swapgs:	 	



retint_swapgs:		/* return to user-space */

	/*

	 * The iretq could re-enable interrupts:

	 */
@@ -557,7 +561,7 @@ retint_swapgs: 
	swapgs 

	jmp restore_args



retint_restore_args:				

retint_restore_args:	/* return to kernel space */

	cli

	/*

	 * The iretq could re-enable interrupts:
@@ -875,17 +879,12 @@ error_exit: 
	GET_THREAD_INFO(%rcx)	

	testl %eax,%eax

	jne  retint_kernel

	LOCKDEP_SYS_EXIT_IRQ

	movl  threadinfo_flags(%rcx),%edx

	movl  $_TIF_WORK_MASK,%edi

	andl  %edi,%edx

	jnz  retint_careful

	/*

	 * The iret might restore flags:

	 */

	TRACE_IRQS_IRETQ

	swapgs 

	RESTORE_ARGS 0,8,0						

	jmp iret_label

	jmp retint_swapgs

	CFI_ENDPROC



error_kernelspace:

arch/x86/lib/thunk_64.S

+4 −0
Original line number Diff line number Diff line
@@ -51,6 +51,10 @@ 
	thunk trace_hardirqs_off_thunk,trace_hardirqs_off

#endif



#ifdef CONFIG_DEBUG_LOCK_ALLOC

	thunk lockdep_sys_exit_thunk,lockdep_sys_exit

#endif

	

	/* SAVE_ARGS below is used only for the .cfi directives it contains. */

	CFI_STARTPROC

	SAVE_ARGS

include/asm-x86/irqflags_64.h

+14 −0
Original line number Diff line number Diff line
@@ -137,6 +137,20 @@ static inline void halt(void) 
#  define TRACE_IRQS_ON

#  define TRACE_IRQS_OFF

# endif

# ifdef CONFIG_DEBUG_LOCK_ALLOC

#  define LOCKDEP_SYS_EXIT	call lockdep_sys_exit_thunk

#  define LOCKDEP_SYS_EXIT_IRQ	\

	TRACE_IRQS_ON; \

	sti; \

	SAVE_REST; \

	LOCKDEP_SYS_EXIT; \

	RESTORE_REST; \

	cli; \

	TRACE_IRQS_OFF;

# else

#  define LOCKDEP_SYS_EXIT

#  define LOCKDEP_SYS_EXIT_IRQ

# endif

#endif



#endif