[PATCH V10 02/28] powerpc, process: Add the function flush_tmregs_to_thread
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STALE3783d
From: Anshuman Khandual <hidden>
Date: 2016-02-16 09:01:44
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Revision v10 of 8 in this series.
Revisions (8)
This patch creates a function flush_tmregs_to_thread which will then be used by subsequent patches in this series. The function checks for self tracing ptrace interface attempts while in the TM context and logs appropriate warning message. Signed-off-by: Anshuman Khandual <redacted> --- arch/powerpc/include/asm/switch_to.h | 8 ++++++++ arch/powerpc/kernel/process.c | 20 ++++++++++++++++++++ 2 files changed, 28 insertions(+)
diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h
index 5b268b6..7b297bf 100644
--- a/arch/powerpc/include/asm/switch_to.h
+++ b/arch/powerpc/include/asm/switch_to.h@@ -70,6 +70,14 @@ static inline void disable_kernel_spe(void) } #endif +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +extern void flush_tmregs_to_thread(struct task_struct *); +#else +static inline void flush_tmregs_to_thread(struct task_struct *t) +{ +} +#endif + static inline void clear_task_ebb(struct task_struct *t) { #ifdef CONFIG_PPC_BOOK3S_64
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index dccc87e..2c4fa7f 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c@@ -918,6 +918,26 @@ static inline void restore_sprs(struct thread_struct *old_thread, #endif } +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +void flush_tmregs_to_thread(struct task_struct *tsk) +{ + /* + * Process self tracing is not yet supported through + * ptrace interface. Ptrace generic code should have + * prevented this from happening in the first place. + * Warn once here with the message, if some how it + * is attempted. + */ + WARN_ONCE(tsk == current, + "Not expecting ptrace on self: TM regs may be incorrect\n"); + + /* + * If task is not current, it should have been flushed + * already to it's thread_struct during __switch_to(). + */ +} +#endif + struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *new) {
--
2.1.0