From: Ira Weiny <ira.weiny@intel.com> To: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org, linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, Fenghua Yu <fenghua.yu@intel.com>, linux-doc@vger.kernel.org, linux-nvdimm@lists.01.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Greg KH <gregkh@linuxfoundation.org> Subject: Re: [PATCH V3 05/10] x86/entry: Pass irqentry_state_t by reference Date: Mon, 16 Nov 2020 10:49:16 -0800 [thread overview] Message-ID: <20201116184916.GA722447@iweiny-DESK2.sc.intel.com> (raw) In-Reply-To: <87mtzi8n0z.fsf@nanos.tec.linutronix.de> On Sun, Nov 15, 2020 at 07:58:52PM +0100, Thomas Gleixner wrote: > Ira, > > On Fri, Nov 06 2020 at 15:29, ira weiny wrote: > > Subject prefix wants to 'entry:'. This changes generic code and the x86 > part is just required to fix the generic code change. Sorry, yes that was carried incorrectly from earlier versions. > > > Currently struct irqentry_state_t only contains a single bool value > > which makes passing it by value is reasonable. However, future patches > > propose to add information to this struct, for example the PKRS > > register/thread state. > > > > Adding information to irqentry_state_t makes passing by value less > > efficient. Therefore, change the entry/exit calls to pass irq_state by > > reference. > > The PKRS muck needs to add an u32 to that struct. So how is that a > problem? There are more fields to be added for the kmap/pmem support. So this will be needed eventually. Even though it is not strictly necessary in the next patch. > > The resulting struct still fits into 64bit which is by far more > efficiently passed by value than by reference. So which problem are you > solving here? I'm getting ahead of myself a bit. I will be adding more fields for the kmap/pmem tracking. Would you accept just a clean up for the variable names in this patch? I could then add the pass by reference when I add the new fields later. Or would an update to the commit message be ok to land this now? Ira > > Thanks > > tglx > _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org
WARNING: multiple messages have this Message-ID (diff)
From: Ira Weiny <ira.weiny@intel.com> To: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org, linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, Fenghua Yu <fenghua.yu@intel.com>, linux-doc@vger.kernel.org, linux-nvdimm@lists.01.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Dan Williams <dan.j.williams@intel.com>, Greg KH <gregkh@linuxfoundation.org> Subject: Re: [PATCH V3 05/10] x86/entry: Pass irqentry_state_t by reference Date: Mon, 16 Nov 2020 10:49:16 -0800 [thread overview] Message-ID: <20201116184916.GA722447@iweiny-DESK2.sc.intel.com> (raw) In-Reply-To: <87mtzi8n0z.fsf@nanos.tec.linutronix.de> On Sun, Nov 15, 2020 at 07:58:52PM +0100, Thomas Gleixner wrote: > Ira, > > On Fri, Nov 06 2020 at 15:29, ira weiny wrote: > > Subject prefix wants to 'entry:'. This changes generic code and the x86 > part is just required to fix the generic code change. Sorry, yes that was carried incorrectly from earlier versions. > > > Currently struct irqentry_state_t only contains a single bool value > > which makes passing it by value is reasonable. However, future patches > > propose to add information to this struct, for example the PKRS > > register/thread state. > > > > Adding information to irqentry_state_t makes passing by value less > > efficient. Therefore, change the entry/exit calls to pass irq_state by > > reference. > > The PKRS muck needs to add an u32 to that struct. So how is that a > problem? There are more fields to be added for the kmap/pmem support. So this will be needed eventually. Even though it is not strictly necessary in the next patch. > > The resulting struct still fits into 64bit which is by far more > efficiently passed by value than by reference. So which problem are you > solving here? I'm getting ahead of myself a bit. I will be adding more fields for the kmap/pmem tracking. Would you accept just a clean up for the variable names in this patch? I could then add the pass by reference when I add the new fields later. Or would an update to the commit message be ok to land this now? Ira > > Thanks > > tglx >
next prev parent reply other threads:[~2020-11-16 18:49 UTC|newest] Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-06 23:28 [PATCH V3 00/10] PKS: Add Protection Keys Supervisor (PKS) support V3 ira.weiny 2020-11-06 23:28 ` ira.weiny 2020-11-06 23:28 ` [PATCH V3 01/10] x86/pkeys: Create pkeys_common.h ira.weiny 2020-11-06 23:28 ` ira.weiny 2020-11-06 23:29 ` [PATCH V3 02/10] x86/fpu: Refactor arch_set_user_pkey_access() for PKS support ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-11-06 23:29 ` [PATCH V3 03/10] x86/pks: Add PKS defines and Kconfig options ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-11-06 23:29 ` [PATCH V3 04/10] x86/pks: Preserve the PKRS MSR on context switch ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-12-17 14:50 ` Thomas Gleixner 2020-12-17 14:50 ` Thomas Gleixner 2020-12-17 22:43 ` Thomas Gleixner 2020-12-17 22:43 ` Thomas Gleixner 2020-12-18 13:57 ` Thomas Gleixner 2020-12-18 13:57 ` Thomas Gleixner 2020-12-18 19:20 ` Dan Williams 2020-12-18 19:20 ` Dan Williams 2020-12-18 19:20 ` Dan Williams 2020-12-18 21:06 ` Thomas Gleixner 2020-12-18 21:06 ` Thomas Gleixner 2020-12-18 21:58 ` Dan Williams 2020-12-18 21:58 ` Dan Williams 2020-12-18 21:58 ` Dan Williams 2020-12-18 22:44 ` Thomas Gleixner 2020-12-18 22:44 ` Thomas Gleixner 2020-12-18 19:42 ` Ira Weiny 2020-12-18 19:42 ` Ira Weiny 2020-12-18 20:10 ` Dave Hansen 2020-12-18 20:10 ` Dave Hansen 2020-12-18 21:30 ` Thomas Gleixner 2020-12-18 21:30 ` Thomas Gleixner 2020-12-18 4:05 ` Ira Weiny 2020-12-18 4:05 ` Ira Weiny 2020-12-17 20:41 ` [NEEDS-REVIEW] " Dave Hansen 2020-12-17 20:41 ` Dave Hansen 2020-12-18 4:10 ` Ira Weiny 2020-12-18 4:10 ` Ira Weiny 2020-12-18 15:33 ` Dave Hansen 2020-12-18 15:33 ` Dave Hansen 2020-11-06 23:29 ` [PATCH V3 05/10] x86/entry: Pass irqentry_state_t by reference ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-11-15 18:58 ` Thomas Gleixner 2020-11-15 18:58 ` Thomas Gleixner 2020-11-16 18:49 ` Ira Weiny [this message] 2020-11-16 18:49 ` Ira Weiny 2020-11-16 20:36 ` Thomas Gleixner 2020-11-16 20:36 ` Thomas Gleixner 2020-11-24 6:09 ` [PATCH V3.1] entry: " ira.weiny 2020-11-24 6:09 ` ira.weiny 2020-12-11 22:14 ` Andy Lutomirski 2020-12-11 22:14 ` Andy Lutomirski 2020-12-11 22:14 ` Andy Lutomirski 2020-12-16 1:32 ` Ira Weiny 2020-12-16 1:32 ` Ira Weiny 2020-12-16 1:32 ` Ira Weiny 2020-12-16 2:09 ` Andy Lutomirski 2020-12-16 2:09 ` Andy Lutomirski 2020-12-16 2:09 ` Andy Lutomirski 2020-12-17 0:38 ` Ira Weiny 2020-12-17 0:38 ` Ira Weiny 2020-12-17 0:38 ` Ira Weiny 2020-12-17 13:07 ` Thomas Gleixner 2020-12-17 13:07 ` Thomas Gleixner 2020-12-17 13:07 ` Thomas Gleixner 2020-12-17 13:19 ` Peter Zijlstra 2020-12-17 13:19 ` Peter Zijlstra 2020-12-17 13:19 ` Peter Zijlstra 2020-12-17 15:35 ` Andy Lutomirski 2020-12-17 15:35 ` Andy Lutomirski 2020-12-17 15:35 ` Andy Lutomirski 2020-12-17 16:58 ` Thomas Gleixner 2020-12-17 16:58 ` Thomas Gleixner 2020-11-06 23:29 ` [PATCH V3 06/10] x86/entry: Preserve PKRS MSR across exceptions ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-12-17 15:28 ` Thomas Gleixner 2020-12-17 15:28 ` Thomas Gleixner 2020-11-06 23:29 ` [PATCH V3 07/10] x86/fault: Report the PKRS state on fault ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-11-06 23:29 ` [PATCH V3 08/10] x86/pks: Add PKS kernel API ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-12-23 20:39 ` Randy Dunlap 2020-12-23 20:39 ` Randy Dunlap 2020-11-06 23:29 ` [PATCH V3 09/10] x86/pks: Enable Protection Keys Supervisor (PKS) ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-11-06 23:29 ` [PATCH V3 10/10] x86/pks: Add PKS test code ira.weiny 2020-11-06 23:29 ` ira.weiny 2020-12-17 20:55 ` Dave Hansen 2020-12-17 20:55 ` Dave Hansen 2020-12-18 4:05 ` Ira Weiny 2020-12-18 4:05 ` Ira Weiny 2020-12-18 16:59 ` Dan Williams 2020-12-18 16:59 ` Dan Williams 2020-12-18 16:59 ` Dan Williams 2020-12-07 22:14 ` [PATCH V3 00/10] PKS: Add Protection Keys Supervisor (PKS) support V3 Ira Weiny 2020-12-07 22:14 ` Ira Weiny 2020-12-08 15:55 ` Thomas Gleixner 2020-12-08 15:55 ` Thomas Gleixner 2020-12-08 17:22 ` Ira Weiny 2020-12-08 17:22 ` Ira Weiny
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20201116184916.GA722447@iweiny-DESK2.sc.intel.com \ --to=ira.weiny@intel.com \ --cc=akpm@linux-foundation.org \ --cc=bp@alien8.de \ --cc=dave.hansen@linux.intel.com \ --cc=fenghua.yu@intel.com \ --cc=gregkh@linuxfoundation.org \ --cc=linux-doc@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-kselftest@vger.kernel.org \ --cc=linux-mm@kvack.org \ --cc=linux-nvdimm@lists.01.org \ --cc=luto@kernel.org \ --cc=mingo@redhat.com \ --cc=peterz@infradead.org \ --cc=tglx@linutronix.de \ --cc=x86@kernel.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.