From: Dave Hansen <dave.hansen@intel.com>
To: Ram Pai <linuxram@us.ibm.com>,
shuahkh@osg.samsung.com, linux-kselftest@vger.kernel.org
Cc: linux-arch@vger.kernel.org, fweimer@redhat.com, x86@kernel.org,
mhocko@kernel.org, linux-mm@kvack.org, mingo@redhat.com,
aneesh.kumar@linux.vnet.ibm.com, bauerman@linux.vnet.ibm.com,
msuchanek@suse.de, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v13 18/24] selftests/vm: fix an assertion in test_pkey_alloc_exhaust()
Date: Wed, 20 Jun 2018 08:11:07 -0700 [thread overview]
Message-ID: <55227442-a573-62b1-3206-1f3065a4b55f@intel.com> (raw)
In-Reply-To: <1528937115-10132-19-git-send-email-linuxram@us.ibm.com>
On 06/13/2018 05:45 PM, Ram Pai wrote:
> /*
> - * There are 16 pkeys supported in hardware. Three are
> - * allocated by the time we get here:
> - * 1. The default key (0)
> - * 2. One possibly consumed by an execute-only mapping.
> - * 3. One allocated by the test code and passed in via
> - * 'pkey' to this function.
> - * Ensure that we can allocate at least another 13 (16-3).
> + * There are NR_PKEYS pkeys supported in hardware. arch_reserved_keys()
> + * are reserved. One of which is the default key(0). One can be taken
> + * up by an execute-only mapping.
> + * Ensure that we can allocate at least the remaining.
> */
> - pkey_assert(i >= NR_PKEYS-3);
> + pkey_assert(i >= (NR_PKEYS-arch_reserved_keys()-1));
We recently had a bug here. I fixed it and left myself a really nice
comment so I and others wouldn't screw it up in the future.
Does this kill my nice, new comment?
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Ram Pai <linuxram@us.ibm.com>,
shuahkh@osg.samsung.com, linux-kselftest@vger.kernel.org
Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org,
linux-mm@kvack.org, x86@kernel.org, linux-arch@vger.kernel.org,
mingo@redhat.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com,
fweimer@redhat.com, msuchanek@suse.de,
aneesh.kumar@linux.vnet.ibm.com
Subject: Re: [PATCH v13 18/24] selftests/vm: fix an assertion in test_pkey_alloc_exhaust()
Date: Wed, 20 Jun 2018 08:11:07 -0700 [thread overview]
Message-ID: <55227442-a573-62b1-3206-1f3065a4b55f@intel.com> (raw)
Message-ID: <20180620151107.fvKBeH62SD8ArNBcPLRn1gmI2TfjlJddDf_NsRgVrdQ@z> (raw)
In-Reply-To: <1528937115-10132-19-git-send-email-linuxram@us.ibm.com>
On 06/13/2018 05:45 PM, Ram Pai wrote:
> /*
> - * There are 16 pkeys supported in hardware. Three are
> - * allocated by the time we get here:
> - * 1. The default key (0)
> - * 2. One possibly consumed by an execute-only mapping.
> - * 3. One allocated by the test code and passed in via
> - * 'pkey' to this function.
> - * Ensure that we can allocate at least another 13 (16-3).
> + * There are NR_PKEYS pkeys supported in hardware. arch_reserved_keys()
> + * are reserved. One of which is the default key(0). One can be taken
> + * up by an execute-only mapping.
> + * Ensure that we can allocate at least the remaining.
> */
> - pkey_assert(i >= NR_PKEYS-3);
> + pkey_assert(i >= (NR_PKEYS-arch_reserved_keys()-1));
We recently had a bug here. I fixed it and left myself a really nice
comment so I and others wouldn't screw it up in the future.
Does this kill my nice, new comment?
next prev parent reply other threads:[~2018-06-20 15:11 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-14 0:44 [PATCH v13 00/24] selftests, powerpc, x86 : Memory Protection Keys Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-14 0:44 ` [PATCH v13 01/24] selftests/x86: Move protecton key selftest to arch neutral directory Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-14 0:44 ` [PATCH v13 02/24] selftests/vm: rename all references to pkru to a generic name Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-14 0:44 ` [PATCH v13 03/24] selftests/vm: move generic definitions to header file Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-14 0:44 ` [PATCH v13 04/24] selftests/vm: move arch-specific definitions to arch-specific header Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-14 0:44 ` [PATCH v13 05/24] selftests/vm: Make gcc check arguments of sigsafe_printf() Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-14 0:44 ` [PATCH v13 06/24] selftests/vm: typecast the pkey register Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-14 0:44 ` [PATCH v13 07/24] selftests/vm: generic function to handle shadow key register Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-14 0:44 ` [PATCH v13 08/24] selftests/vm: fix the wrong assert in pkey_disable_set() Ram Pai
2018-06-14 0:44 ` Ram Pai
2018-06-20 14:47 ` Dave Hansen
2018-06-20 14:47 ` Dave Hansen
2018-07-17 15:58 ` Ram Pai
2018-07-17 15:58 ` Ram Pai
2018-07-17 17:53 ` Dave Hansen
2018-07-17 17:53 ` Dave Hansen
2018-06-14 0:45 ` [PATCH v13 09/24] selftests/vm: fixed bugs in pkey_disable_clear() Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 10/24] selftests/vm: clear the bits in shadow reg when a pkey is freed Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 14:49 ` Dave Hansen
2018-06-20 14:49 ` Dave Hansen
2018-07-17 16:00 ` Ram Pai
2018-07-17 16:00 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 11/24] selftests/vm: fix alloc_random_pkey() to make it really random Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 12/24] selftests/vm: introduce two arch independent abstraction Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 13/24] selftests/vm: pkey register should match shadow pkey Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 14:53 ` Dave Hansen
2018-06-20 14:53 ` Dave Hansen
2018-07-17 16:02 ` Ram Pai
2018-07-17 16:02 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 14/24] selftests/vm: generic cleanup Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 14:57 ` Dave Hansen
2018-06-20 14:57 ` Dave Hansen
2018-06-14 0:45 ` [PATCH v13 15/24] selftests/vm: powerpc implementation for generic abstraction Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 15:06 ` Dave Hansen
2018-06-20 15:06 ` Dave Hansen
2018-06-14 0:45 ` [PATCH v13 16/24] selftests/vm: clear the bits in shadow reg when a pkey is freed Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 15:07 ` Dave Hansen
2018-06-20 15:07 ` Dave Hansen
2018-07-17 16:03 ` Ram Pai
2018-07-17 16:03 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 17/24] selftests/vm: powerpc implementation to check support for pkey Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 15:09 ` Dave Hansen
2018-06-20 15:09 ` Dave Hansen
2018-07-17 16:05 ` Ram Pai
2018-07-17 16:05 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 18/24] selftests/vm: fix an assertion in test_pkey_alloc_exhaust() Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 15:11 ` Dave Hansen [this message]
2018-06-20 15:11 ` Dave Hansen
2018-07-17 16:08 ` Ram Pai
2018-07-17 16:08 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 19/24] selftests/vm: associate key on a mapped page and detect access violation Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 15:16 ` Dave Hansen
2018-06-20 15:16 ` Dave Hansen
2018-07-17 16:13 ` Ram Pai
2018-07-17 16:13 ` Ram Pai
2018-07-17 17:56 ` Dave Hansen
2018-07-17 17:56 ` Dave Hansen
2018-07-17 19:10 ` Ram Pai
2018-07-17 19:10 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 20/24] selftests/vm: associate key on a mapped page and detect write violation Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 21/24] selftests/vm: detect write violation on a mapped access-denied-key page Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 22/24] selftests/vm: testcases must restore pkey-permissions Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 15:20 ` Dave Hansen
2018-06-20 15:20 ` Dave Hansen
2018-07-17 16:09 ` Ram Pai
2018-07-17 16:09 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 23/24] selftests/vm: sub-page allocator Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-14 0:45 ` [PATCH v13 24/24] selftests/vm: test correct behavior of pkey-0 Ram Pai
2018-06-14 0:45 ` Ram Pai
2018-06-20 15:22 ` Dave Hansen
2018-06-20 15:22 ` Dave Hansen
2018-06-14 20:19 ` [PATCH v13 00/24] selftests, powerpc, x86 : Memory Protection Keys Florian Weimer
2018-06-14 20:19 ` Florian Weimer
2018-06-15 0:58 ` Ram Pai
2018-06-15 0:58 ` Ram Pai
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