From: Robin Murphy <robin.murphy@arm.com> To: Tianling Shen <cnsztl@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de>, Anshuman Khandual <anshuman.khandual@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, "Gustavo A. R. Silva" <gustavoars@kernel.org>, linux-kernel@vger.kernel.org, Sumit Gupta <sumitg@nvidia.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Will Deacon <will@kernel.org>, Dave Martin <Dave.Martin@arm.com>, linux-arm-kernel@lists.infradead.org Subject: Re: [RESENT PATCH] arm64: cpuinfo: Add "model name" in /proc/cpuinfo for 64bit tasks also Date: Tue, 2 Feb 2021 13:09:02 +0000 [thread overview] Message-ID: <0c7bfb19-c6ca-1700-8203-fb54e8c1ffae@arm.com> (raw) In-Reply-To: <20210201235809.401-1-cnsztl@gmail.com> On 2021-02-01 23:58, Tianling Shen wrote: > From: Sumit Gupta <sumitg@nvidia.com> > > Removed restriction of displaying model name for 32 bit tasks only. > This can be used for 64 bit tasks as well, and it's useful for some > tools that already parse this, such as coreutils `uname -p`, Ubuntu > model name display etc. How exactly is it useful? It clearly isn't necessary for compatibility, since AArch64 userspace has apparently been running quite happily for 8 years without it. It also doesn't convey anything meaningful to the user, since they already know they're on an Armv8-compatible processor by the fact that they're running AArch64 userspace at all. Robin. > It should be like this: > ``` > $ cat '/proc/cpuinfo' | grep 'model name' | head -n 1 > model name : ARMv8 Processor rev X (v8l) > ``` > > Link: https://lore.kernel.org/lkml/1472461345-28219-1-git-send-email-sumitg@nvidia.com/ > > Signed-off-by: Sumit Gupta <sumitg@nvidia.com> > Signed-off-by: Tianling Shen <cnsztl@gmail.com> > --- > arch/arm64/kernel/cpuinfo.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c > index 77605aec25fe..d69b4e486098 100644 > --- a/arch/arm64/kernel/cpuinfo.c > +++ b/arch/arm64/kernel/cpuinfo.c > @@ -148,8 +148,7 @@ static int c_show(struct seq_file *m, void *v) > * "processor". Give glibc what it expects. > */ > seq_printf(m, "processor\t: %d\n", i); > - if (compat) > - seq_printf(m, "model name\t: ARMv8 Processor rev %d (%s)\n", > + seq_printf(m, "model name\t: ARMv8 Processor rev %d (%s)\n", > MIDR_REVISION(midr), COMPAT_ELF_PLATFORM); > > seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", >
WARNING: multiple messages have this Message-ID (diff)
From: Robin Murphy <robin.murphy@arm.com> To: Tianling Shen <cnsztl@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de>, Suzuki K Poulose <suzuki.poulose@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Anshuman Khandual <anshuman.khandual@arm.com>, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" <gustavoars@kernel.org>, Sumit Gupta <sumitg@nvidia.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Will Deacon <will@kernel.org>, Dave Martin <Dave.Martin@arm.com>, linux-arm-kernel@lists.infradead.org Subject: Re: [RESENT PATCH] arm64: cpuinfo: Add "model name" in /proc/cpuinfo for 64bit tasks also Date: Tue, 2 Feb 2021 13:09:02 +0000 [thread overview] Message-ID: <0c7bfb19-c6ca-1700-8203-fb54e8c1ffae@arm.com> (raw) In-Reply-To: <20210201235809.401-1-cnsztl@gmail.com> On 2021-02-01 23:58, Tianling Shen wrote: > From: Sumit Gupta <sumitg@nvidia.com> > > Removed restriction of displaying model name for 32 bit tasks only. > This can be used for 64 bit tasks as well, and it's useful for some > tools that already parse this, such as coreutils `uname -p`, Ubuntu > model name display etc. How exactly is it useful? It clearly isn't necessary for compatibility, since AArch64 userspace has apparently been running quite happily for 8 years without it. It also doesn't convey anything meaningful to the user, since they already know they're on an Armv8-compatible processor by the fact that they're running AArch64 userspace at all. Robin. > It should be like this: > ``` > $ cat '/proc/cpuinfo' | grep 'model name' | head -n 1 > model name : ARMv8 Processor rev X (v8l) > ``` > > Link: https://lore.kernel.org/lkml/1472461345-28219-1-git-send-email-sumitg@nvidia.com/ > > Signed-off-by: Sumit Gupta <sumitg@nvidia.com> > Signed-off-by: Tianling Shen <cnsztl@gmail.com> > --- > arch/arm64/kernel/cpuinfo.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c > index 77605aec25fe..d69b4e486098 100644 > --- a/arch/arm64/kernel/cpuinfo.c > +++ b/arch/arm64/kernel/cpuinfo.c > @@ -148,8 +148,7 @@ static int c_show(struct seq_file *m, void *v) > * "processor". Give glibc what it expects. > */ > seq_printf(m, "processor\t: %d\n", i); > - if (compat) > - seq_printf(m, "model name\t: ARMv8 Processor rev %d (%s)\n", > + seq_printf(m, "model name\t: ARMv8 Processor rev %d (%s)\n", > MIDR_REVISION(midr), COMPAT_ELF_PLATFORM); > > seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-02-02 13:10 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-01 23:58 [RESENT PATCH] arm64: cpuinfo: Add "model name" in /proc/cpuinfo for 64bit tasks also Tianling Shen 2021-02-01 23:58 ` Tianling Shen 2021-02-02 11:39 ` Catalin Marinas 2021-02-02 11:39 ` Catalin Marinas 2021-02-02 13:06 ` CN_SZTL 2021-02-02 13:06 ` CN_SZTL 2021-02-02 13:09 ` Robin Murphy [this message] 2021-02-02 13:09 ` Robin Murphy
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