From: Frederic Weisbecker Date: Mon, 23 Nov 2009 14:42:33 +0000 (+0100) Subject: hw-breakpoints: Check the breakpoint params from perf tools X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fdf6bc95229821e3d9405eba28925b76e92b74d0;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git hw-breakpoints: Check the breakpoint params from perf tools Perf tools create perf events as disabled in the beginning. Breakpoints are then considered like ptrace temporary breakpoints, only meant to reserve a breakpoint slot until we get all the necessary informations from the user. In this case, we don't check the address that is breakpointed as it is NULL in the ptrace case. But perf tools don't have the same purpose, events are created disabled to wait for all events to be created before enabling all of them. We want to check the breakpoint parameters in this case. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: Paul Mackerras Cc: Prasad LKML-Reference: <1258987355-8751-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar --- diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c index c16662268d75..06d372fc026d 100644 --- a/kernel/hw_breakpoint.c +++ b/kernel/hw_breakpoint.c @@ -267,7 +267,16 @@ int __register_perf_hw_breakpoint(struct perf_event *bp) if (ret) return ret; - if (!bp->attr.disabled) + /* + * Ptrace breakpoints can be temporary perf events only + * meant to reserve a slot. In this case, it is created disabled and + * we don't want to check the params right now (as we put a null addr) + * But perf tools create events as disabled and we want to check + * the params for them. + * This is a quick hack that will be removed soon, once we remove + * the tmp breakpoints from ptrace + */ + if (!bp->attr.disabled || bp->callback == perf_bp_event) ret = arch_validate_hwbkpt_settings(bp, bp->ctx->task); return ret;