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From: Peter Zijlstra <peterz@infradead.org>
To: Ira Weiny <ira.weiny@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Andy Lutomirski <luto@kernel.org>,
	x86@kernel.org, Dave Hansen <dave.hansen@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Fenghua Yu <fenghua.yu@intel.com>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org,
	linux-mm@kvack.org, linux-kselftest@vger.kernel.org
Subject: Re: [RFC PATCH 11/15] memremap: Add zone device access protection
Date: Tue, 14 Jul 2020 21:40:31 +0200
Message-ID: <20200714194031.GI5523@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20200714191047.GE3008823@iweiny-DESK2.sc.intel.com>

On Tue, Jul 14, 2020 at 12:10:47PM -0700, Ira Weiny wrote:
> On Tue, Jul 14, 2020 at 10:40:57AM +0200, Peter Zijlstra wrote:

> > That's an anti-pattern vs static_keys, I'm thinking you actually want
> > static_key_slow_{inc,dec}() instead of {enable,disable}().
> 
> Thanks.  I'll go read the doc for those as I'm not familiar with them.

Look for static_branch_{inc,dec} in include/linux/jump_label.h, it
basically does the refcount thing you need and does the actual
transition on the 0->1 and 1->0 transitions.

  reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14  7:02 [RFC PATCH 00/15] PKS: Add Protection Keys Supervisor (PKS) support ira.weiny
2020-07-14  7:02 ` [RFC PATCH 01/15] x86/pkeys: Create pkeys_internal.h ira.weiny
2020-07-14  7:02 ` [RFC PATCH 02/15] x86/fpu: Refactor arch_set_user_pkey_access() for PKS support ira.weiny
2020-07-14  7:02 ` [RFC PATCH 03/15] x86/pks: Enable Protection Keys Supervisor (PKS) ira.weiny
2020-07-14  7:02 ` [RFC PATCH 04/15] x86/pks: Preserve the PKRS MSR on context switch ira.weiny
2020-07-14  8:27   ` Peter Zijlstra
2020-07-14 18:53     ` Ira Weiny
2020-07-14 18:56       ` Dave Hansen
2020-07-14 19:05       ` Peter Zijlstra
2020-07-14 19:09         ` Ira Weiny
2020-07-16  8:37   ` [x86/pks] 061e3e0b92: leaking-addresses.dmesg.uncheckedMSRaccesserror:WRMSRto0x6e1(triedtowrite0x0000000055555554)atrIP:(write_pkrs+0x15/0x2b) kernel test robot
2020-07-14  7:02 ` [RFC PATCH 05/15] x86/pks: Add PKS kernel API ira.weiny
2020-07-14  7:02 ` [RFC PATCH 06/15] x86/pks: Add a debugfs file for allocated PKS keys ira.weiny
2020-07-14  7:02 ` [RFC PATCH 07/15] Documentation/pkeys: Update documentation for kernel pkeys ira.weiny
2020-07-14  7:02 ` [RFC PATCH 08/15] x86/pks: Add PKS Test code ira.weiny
2020-07-14  7:02 ` [RFC PATCH 09/15] fs/dax: Remove unused size parameter ira.weiny
2020-07-14  7:02 ` [RFC PATCH 10/15] drivers/dax: Expand lock scope to cover the use of addresses ira.weiny
2020-07-14  7:02 ` [RFC PATCH 11/15] memremap: Add zone device access protection ira.weiny
2020-07-14  8:40   ` Peter Zijlstra
2020-07-14 19:10     ` Ira Weiny
2020-07-14 19:40       ` Peter Zijlstra [this message]
2020-07-14  7:02 ` [RFC PATCH 12/15] kmap: Add stray write protection for device pages ira.weiny
2020-07-14  8:44   ` Peter Zijlstra
2020-07-14 19:06     ` Ira Weiny
2020-07-14 19:29       ` Peter Zijlstra
2020-07-14 19:42         ` Dave Hansen
2020-07-14 19:49           ` Peter Zijlstra
2020-07-14 20:00           ` Ira Weiny
2020-07-14  7:02 ` [RFC PATCH 13/15] dax: Stray write protection for dax_direct_access() ira.weiny
2020-07-14  7:02 ` [RFC PATCH 14/15] nvdimm/pmem: Stray write protection for pmem->virt_addr ira.weiny
2020-07-14  7:02 ` [RFC PATCH 15/15] [dax|pmem]: Enable stray write protection ira.weiny

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