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Date: Sat, 28 Nov 2015 15:50:09 +0800 From: Li Bin <huawei.libin@...wei.com> To: <rostedt@...dmis.org>, <mingo@...hat.com>, <catalin.marinas@....com>, <will.deacon@....com> CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <guohanjun@...wei.com>, <dingtianhong@...wei.com>, <huawei.libin@...wei.com> Subject: [PATCH] arm64: ftrace: stop using kstop_machine to enable/disable tracing On arm64, kstop_machine which is hugely disruptive to a running system is not needed to convert nops to ftrace calls or back, because that modifed code is a single 32bit instructions which is impossible to cross cache (or page) boundaries, and the used str instruction is single-copy atomic. Cc: <stable@...r.kernel.org> # 3.18+ Signed-off-by: Li Bin <huawei.libin@...wei.com> --- arch/arm64/kernel/ftrace.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c index c851be7..9669b33 100644 --- a/arch/arm64/kernel/ftrace.c +++ b/arch/arm64/kernel/ftrace.c @@ -93,6 +93,11 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, return ftrace_modify_code(pc, old, new, true); } +void arch_ftrace_update_code(int command) +{ + ftrace_modify_all_code(command); +} + int __init ftrace_dyn_arch_init(void) { return 0; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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