linux-kernel - Re: [RFC 2/4] perf: Pass pmu pointer to perf_paranoid

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Date:   Tue, 3 Jul 2018 15:54:16 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Tvrtko Ursulin <tursulin@...ulin.net>
Cc:     linux-kernel@...r.kernel.org,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        x86@...nel.org, Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [RFC 2/4] perf: Pass pmu pointer to perf_paranoid_* helpers

Hi Tvrtko,

> @@ -199,7 +199,7 @@ static inline void perf_get_data_addr(struct pt_regs *regs, u64 *addrp)
>  	if (!(mmcra & MMCRA_SAMPLE_ENABLE) || sdar_valid)
>  		*addrp = mfspr(SPRN_SDAR);
>  
> -	if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN) &&
> +	if (perf_paranoid_kernel(ppmu) && !capable(CAP_SYS_ADMIN) &&
>  		is_kernel_addr(mfspr(SPRN_SDAR)))
>  		*addrp = 0;
>  }

This patch fails for me on powerpc:

arch/powerpc/perf/core-book3s.c: In function ‘perf_get_data_addr’:
arch/powerpc/perf/core-book3s.c:202:27: error: passing argument 1 of ‘perf_paranoid_kernel’ from incompatible pointer type [-Werror=incompatible-pointer-types]
  if (perf_paranoid_kernel(ppmu) && !capable(CAP_SYS_ADMIN) &&
                           ^~~~
In file included from arch/powerpc/perf/core-book3s.c:13:0:
./include/linux/perf_event.h:1191:20: note: expected ‘const struct pmu *’ but argument is of type ‘struct power_pmu *’
 static inline bool perf_paranoid_kernel(const struct pmu *pmu)
                    ^~~~~~~~~~~~~~~~~~~~
arch/powerpc/perf/core-book3s.c: In function ‘power_pmu_bhrb_read’:
arch/powerpc/perf/core-book3s.c:470:8: error: too few arguments to function ‘perf_paranoid_kernel’
    if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN) &&
        ^~~~~~~~~~~~~~~~~~~~
In file included from arch/powerpc/perf/core-book3s.c:13:0:
./include/linux/perf_event.h:1191:20: note: declared here
 static inline bool perf_paranoid_kernel(const struct pmu *pmu)
                    ^~~~~~~~~~~~~~~~~~~~
  CC      net/ipv6/route.o