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Groups > linux.kernel > #1538785
| From | Josh Poimboeuf <jpoimboe@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v3 05/15] livepatch/powerpc: add TIF_PATCH_PENDING thread flag |
| Date | 2016-12-08 19:20 +0100 |
| Message-ID | <sMbsu-Yb-37@gated-at.bofh.it> (permalink) |
| References | <sMbst-Yb-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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: Josh Poimboeuf <jpoimboe@redhat.com> --- arch/powerpc/include/asm/thread_info.h | 4 +++- arch/powerpc/kernel/signal.c | 4 ++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 87e4b2d..6fc6464 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -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 */ diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index bbe77ae..02d78f9 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -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 <asm/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(); } -- 2.7.4
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[PATCH v3 05/15] livepatch/powerpc: add TIF_PATCH_PENDING thread flag Josh Poimboeuf <jpoimboe@redhat.com> - 2016-12-08 19:20 +0100
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