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From: Leo Yan <leo.yan@linaro.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: "Hunter, Adrian" <adrian.hunter@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>, "x86@kernel.org" <x86@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Mike Leach <mike.leach@linaro.org>,
	"linux-perf-users@vger.kernel.org"
	<linux-perf-users@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"coresight@lists.linaro.org" <coresight@lists.linaro.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v4 10/11] perf env: Set flag for kernel is 64-bit mode
Date: Fri, 23 Jul 2021 15:11:59 +0800	[thread overview]
Message-ID: <20210723071159.GF179035@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <YO7uDIQYB9wduMd6@kernel.org>

Hi Arnaldo,

On Wed, Jul 14, 2021 at 11:00:44AM -0300, Arnaldo Carvalho de Melo wrote:

[...]

> > So, I wasn't suggesting to add this info to the perf.data file header,
> > just to the in-memory 'struct perf_env'.
> > 
> > And also we should avoid unconditionally initializing things that we may
> > never need, please structure it as:
> 
> Oops, forgot these:
>  
> > static void perf_env__init_kernel_mode(struct perf_env *env)
> > {
> >        const char *arch = perf_env__raw_arch(env);
> > 
> >        if (!strncmp(arch, "x86_64", 6)   || !strncmp(arch, "aarch64", 7) ||
> >            !strncmp(arch, "arm64", 5)    || !strncmp(arch, "mips64", 6) ||
> >            !strncmp(arch, "parisc64", 8) || !strncmp(arch, "riscv64", 7) ||
> >            !strncmp(arch, "s390x", 5)    || !strncmp(arch, "sparc64", 7))
> >                kernel_is_64_bit = 1;
>                  env->kernel_is_64_bit = 1;
> >        else
> >                kernel_is_64_bit = 0;
>                  env->kernel_is_64_bit = 0;
> > }
> > 
> > 
> > void perf_env__init(struct perf_env *env)
> > {
> > 	...
> > 	env->kernel_is_64_bit = -1;
> > 	...
> > }
> > 
> > bool perf_env__kernel_is_64_bit(struct perf_env *env)
> > {
> > 	if (env->kernel_is_64_bit == -1)
> > 		perf_env__init_kernel_mode(env);
> > 
> > 	return env->kernel_is_64_bit;
> > }

Thanks a lot for the suggestion; this is much clear for me, will spin
new patch set by following it.

Sorry for slow response due to my bandwidth was occupied by a task in
hand.

Thanks,
Leo

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  reply	other threads:[~2021-07-23  7:13 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-11 10:40 [PATCH v4 00/11] perf: Refine barriers for AUX ring buffer Leo Yan
2021-07-11 10:40 ` [PATCH v4 01/11] perf/ring_buffer: Add comment for barriers on " Leo Yan
2021-07-11 10:40 ` [PATCH v4 02/11] coresight: tmc-etr: Add barrier after updating " Leo Yan
2021-07-12 10:40   ` Suzuki K Poulose
2021-07-12 10:54     ` Leo Yan
2021-07-11 10:40 ` [PATCH v4 03/11] coresight: tmc-etf: Add comment for store ordering Leo Yan
2021-07-13 12:56   ` Peter Zijlstra
2021-07-13 15:49     ` Leo Yan
2021-07-11 10:40 ` [PATCH v4 04/11] perf/x86: Add barrier after updating bts Leo Yan
2021-07-13 13:01   ` Peter Zijlstra
2021-07-11 10:40 ` [PATCH v4 05/11] perf auxtrace: Use WRITE_ONCE() for updating aux_tail Leo Yan
2021-07-11 10:41 ` [PATCH v4 06/11] perf auxtrace: Drop legacy __sync functions Leo Yan
2021-07-11 10:41 ` [PATCH v4 07/11] perf auxtrace: Remove auxtrace_mmap__read_snapshot_head() Leo Yan
2021-07-12 14:32   ` Adrian Hunter
2021-07-13 13:10     ` Leo Yan
2021-07-11 10:41 ` [PATCH v4 08/11] perf: Cleanup for HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT Leo Yan
2021-07-11 10:41 ` [PATCH v4 09/11] tools: Remove feature-sync-compare-and-swap feature detection Leo Yan
2021-07-11 10:41 ` [PATCH v4 10/11] perf env: Set flag for kernel is 64-bit mode Leo Yan
2021-07-12 14:37   ` Adrian Hunter
2021-07-12 18:14   ` Arnaldo Carvalho de Melo
2021-07-13 15:09     ` Leo Yan
2021-07-13 17:31       ` Hunter, Adrian
2021-07-14 13:59         ` Arnaldo Carvalho de Melo
2021-07-14 14:00           ` Arnaldo Carvalho de Melo
2021-07-23  7:11             ` Leo Yan [this message]
2021-07-11 10:41 ` [PATCH v4 11/11] perf auxtrace: Add compat_auxtrace_mmap__{read_head|write_tail} Leo Yan
2021-07-12 14:44   ` Russell King (Oracle)
2021-07-13 15:46     ` Leo Yan
2021-07-13 16:14       ` Russell King (Oracle)
2021-07-13 18:13         ` Catalin Marinas
2021-07-14  8:40           ` Russell King (Oracle)
2021-07-23  7:23             ` Leo Yan
2021-07-13  7:07   ` Adrian Hunter
2021-07-13 15:48     ` Leo Yan

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