linux-kernel - Re: [PATCH 1/2] events: callchain: Annotate RCU pointer with _

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Date:   Wed, 29 Jan 2020 17:19:38 -0500
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Amol Grover <frextrite@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [PATCH 1/2] events: callchain: Annotate RCU pointer with __rcu

On Wed, Jan 29, 2020 at 09:38:12PM +0530, Amol Grover wrote:
> Fixes following instances of sparse error
> error: incompatible types in comparison expression
> (different address spaces)
> kernel/events/callchain.c:66:9: error: incompatible types in comparison
> kernel/events/callchain.c:96:9: error: incompatible types in comparison
> kernel/events/callchain.c:161:19: error: incompatible types in comparison
> 
> This introduces the following warning
> kernel/events/callchain.c:65:17: warning: incorrect type in assignment

Would have been nice if you mentioned the warning is fixed in your second
patch. But I think its ok.

Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>

thanks,

 - Joel

> 
> Signed-off-by: Amol Grover <frextrite@...il.com>
> ---
>  kernel/events/callchain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c
> index c2b41a263166..f91e1f41d25d 100644
> --- a/kernel/events/callchain.c
> +++ b/kernel/events/callchain.c
> @@ -32,7 +32,7 @@ static inline size_t perf_callchain_entry__sizeof(void)
>  static DEFINE_PER_CPU(int, callchain_recursion[PERF_NR_CONTEXTS]);
>  static atomic_t nr_callchain_events;
>  static DEFINE_MUTEX(callchain_mutex);
> -static struct callchain_cpus_entries *callchain_cpus_entries;
> +static struct callchain_cpus_entries __rcu *callchain_cpus_entries;
>  
>  
>  __weak void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
> -- 
> 2.24.1
>