From: Vishal Verma <vishal.l.verma@intel.com> To: "Luck, Tony" <tony.luck@intel.com> Cc: "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>, "stable@vger.kernel.org" <stable@vger.kernel.org>, "linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org> Subject: Re: [PATCH] acpi, nfit: fix the memory error check in nfit_handle_mce Date: Fri, 21 Apr 2017 14:54:10 -0600 [thread overview] Message-ID: <20170421205410.GD10645@omniknight.lm.intel.com> (raw) In-Reply-To: <20170421205050.GA17595@intel.com> On 04/21, Luck, Tony wrote: > On Fri, Apr 21, 2017 at 02:35:51PM -0600, Vishal Verma wrote: > > On 04/21, Luck, Tony wrote: > > > Needs extra parentheses to make it right. Vishal, sorry I led you astray. > > > > > > if (!((mce->status & 0xef80) == BIT(7))) > > > > Is this still right though? Anything AND'ed with 0xef80 will never equal > > BIT(7) which is simply 01000000 binary (the lowest byte of the left hand > > side is '0') > > I think so ... here it is in binary > > ef80 = 1110 1111 1000 0000 > BIT7 = 0000 0000 1000 0000 > > so the "&" will zap bits {6:0} and bit {12} [and everything not part > of the MCACOD field]. > > If mce->status had some bit above BIT(7) set, it won't be zapped, so we > won't match the exact value BIT(7). Ah, you're right, I was off by one, taking BIT(7) to mean 0100 0000 > > -Tony _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm
WARNING: multiple messages have this Message-ID (diff)
From: Vishal Verma <vishal.l.verma@intel.com> To: "Luck, Tony" <tony.luck@intel.com> Cc: "Williams, Dan J" <dan.j.williams@intel.com>, "linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>, "stable@vger.kernel.org" <stable@vger.kernel.org>, "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org> Subject: Re: [PATCH] acpi, nfit: fix the memory error check in nfit_handle_mce Date: Fri, 21 Apr 2017 14:54:10 -0600 [thread overview] Message-ID: <20170421205410.GD10645@omniknight.lm.intel.com> (raw) In-Reply-To: <20170421205050.GA17595@intel.com> On 04/21, Luck, Tony wrote: > On Fri, Apr 21, 2017 at 02:35:51PM -0600, Vishal Verma wrote: > > On 04/21, Luck, Tony wrote: > > > Needs extra parentheses to make it right. Vishal, sorry I led you astray. > > > > > > if (!((mce->status & 0xef80) == BIT(7))) > > > > Is this still right though? Anything AND'ed with 0xef80 will never equal > > BIT(7) which is simply 01000000 binary (the lowest byte of the left hand > > side is '0') > > I think so ... here it is in binary > > ef80 = 1110 1111 1000 0000 > BIT7 = 0000 0000 1000 0000 > > so the "&" will zap bits {6:0} and bit {12} [and everything not part > of the MCACOD field]. > > If mce->status had some bit above BIT(7) set, it won't be zapped, so we > won't match the exact value BIT(7). Ah, you're right, I was off by one, taking BIT(7) to mean 0100 0000 > > -Tony
next prev parent reply other threads:[~2017-04-21 20:55 UTC|newest] Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-20 22:18 [PATCH] acpi, nfit: fix the memory error check in nfit_handle_mce Vishal Verma 2017-04-20 22:18 ` Vishal Verma 2017-04-20 22:18 ` Vishal Verma 2017-04-20 22:21 ` Verma, Vishal L 2017-04-20 22:21 ` Verma, Vishal L 2017-04-21 2:21 ` kbuild test robot 2017-04-21 2:21 ` kbuild test robot 2017-04-21 2:21 ` kbuild test robot 2017-04-21 19:21 ` Dan Williams 2017-04-21 19:21 ` Dan Williams 2017-04-21 19:56 ` Verma, Vishal L 2017-04-21 19:56 ` Verma, Vishal L 2017-04-21 19:56 ` Verma, Vishal L 2017-04-21 20:16 ` Luck, Tony 2017-04-21 20:16 ` Luck, Tony 2017-04-21 20:16 ` Luck, Tony 2017-04-21 20:19 ` Dan Williams 2017-04-21 20:19 ` Dan Williams 2017-04-21 20:27 ` Luck, Tony 2017-04-21 20:27 ` Luck, Tony 2017-04-21 21:07 ` Borislav Petkov 2017-04-21 21:07 ` Borislav Petkov 2017-04-21 21:07 ` Borislav Petkov 2017-04-24 11:36 ` [PATCH 1/2] x86/MCE: Export memory_error() Borislav Petkov 2017-04-24 11:36 ` Borislav Petkov 2017-04-25 21:07 ` Vishal Verma 2017-04-25 21:07 ` Vishal Verma 2017-05-10 19:31 ` Verma, Vishal L 2017-05-10 19:31 ` Verma, Vishal L 2017-05-10 19:31 ` Verma, Vishal L 2017-05-10 20:04 ` Borislav Petkov 2017-05-10 20:04 ` Borislav Petkov 2017-05-10 20:06 ` Verma, Vishal L 2017-05-10 20:06 ` Verma, Vishal L 2017-05-10 20:08 ` Borislav Petkov 2017-05-10 20:08 ` Borislav Petkov 2017-05-10 21:12 ` Verma, Vishal L 2017-05-10 21:12 ` Verma, Vishal L 2017-05-10 21:57 ` Borislav Petkov 2017-05-10 21:57 ` Borislav Petkov 2017-05-10 22:03 ` Verma, Vishal L 2017-05-10 22:03 ` Verma, Vishal L 2017-05-10 22:16 ` Borislav Petkov 2017-05-10 22:16 ` Borislav Petkov 2017-05-10 22:16 ` Borislav Petkov 2017-05-10 22:22 ` Verma, Vishal L 2017-05-10 22:22 ` Verma, Vishal L 2017-05-17 12:38 ` Borislav Petkov 2017-05-17 12:38 ` Borislav Petkov 2017-05-17 12:38 ` Borislav Petkov 2017-05-17 18:58 ` Verma, Vishal L 2017-05-17 18:58 ` Verma, Vishal L 2017-05-17 19:20 ` Borislav Petkov 2017-05-17 19:20 ` Borislav Petkov 2017-04-24 11:37 ` [PATCH 2/2] x86/ras/mce_amd_inj: Preset MCE injection struct Borislav Petkov 2017-04-24 11:37 ` Borislav Petkov 2017-04-26 19:59 ` kbuild test robot 2017-04-26 19:59 ` kbuild test robot 2017-04-21 20:35 ` [PATCH] acpi, nfit: fix the memory error check in nfit_handle_mce Vishal Verma 2017-04-21 20:35 ` Vishal Verma 2017-04-21 20:35 ` Vishal Verma 2017-04-21 20:50 ` Luck, Tony 2017-04-21 20:50 ` Luck, Tony 2017-04-21 20:50 ` Luck, Tony 2017-04-21 20:54 ` Vishal Verma [this message] 2017-04-21 20:54 ` Vishal Verma
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