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Commit a768f784 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Jiri Kosina
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livepatch/powerpc: add TIF_PATCH_PENDING thread flag 



Add the TIF_PATCH_PENDING thread flag to enable the new livepatch
per-task consistency model for powerpc.  The bit getting set indicates
the thread has a pending patch which needs to be applied when the thread
exits the kernel.

The bit is included in the _TIF_USER_WORK_MASK macro so that
do_notify_resume() and klp_update_patch_state() get called when the bit
is set.

Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Reviewed-by: default avatarMiroslav Benes <mbenes@suse.cz>
Reviewed-by: default avatarKamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Reviewed-by: default avatarBalbir Singh <bsingharora@gmail.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent afb94c9e

arch/powerpc/include/asm/thread_info.h

+3 −1
Original line number Diff line number Diff line
@@ -92,6 +92,7 @@ static inline struct thread_info *current_thread_info(void) 
					   TIF_NEED_RESCHED */

#define TIF_32BIT		4	/* 32 bit binary */

#define TIF_RESTORE_TM		5	/* need to restore TM FP/VEC/VSX */

#define TIF_PATCH_PENDING	6	/* pending live patching update */

#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */

#define TIF_SINGLESTEP		8	/* singlestepping active */

#define TIF_NOHZ		9	/* in adaptive nohz mode */
@@ -115,6 +116,7 @@ static inline struct thread_info *current_thread_info(void) 
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

#define _TIF_32BIT		(1<<TIF_32BIT)

#define _TIF_RESTORE_TM		(1<<TIF_RESTORE_TM)

#define _TIF_PATCH_PENDING	(1<<TIF_PATCH_PENDING)

#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)

#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)

#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
@@ -131,7 +133,7 @@ static inline struct thread_info *current_thread_info(void) 


#define _TIF_USER_WORK_MASK	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \

				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \

				 _TIF_RESTORE_TM)

				 _TIF_RESTORE_TM | _TIF_PATCH_PENDING)

#define _TIF_PERSYSCALL_MASK	(_TIF_RESTOREALL|_TIF_NOERROR)



/* Bits in local_flags */

arch/powerpc/kernel/signal.c

+4 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/uprobes.h>

#include <linux/key.h>

#include <linux/context_tracking.h>

#include <linux/livepatch.h>

#include <asm/hw_breakpoint.h>

#include <linux/uaccess.h>

#include <asm/unistd.h>
@@ -162,6 +163,9 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) 
		tracehook_notify_resume(regs);

	}



	if (thread_info_flags & _TIF_PATCH_PENDING)

		klp_update_patch_state(current);



	user_enter();

}