linux-kernel - RE: [PATCH v3] x86/mce: retrieve poison range from hardware

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Message-ID: <41db4a4b17a848798e487a058a2bc237@intel.com>
Date:   Mon, 18 Jul 2022 16:19:51 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Jane Chu <jane.chu@...cle.com>, "bp@...en8.de" <bp@...en8.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hch@....de" <hch@....de>,
        "nvdimm@...ts.linux.dev" <nvdimm@...ts.linux.dev>
Subject: RE: [PATCH v3] x86/mce: retrieve poison range from hardware

+	m.misc = (MCI_MISC_ADDR_PHYS << 6) | __ffs64(mem_err->physical_addr_mask);

Do we want to unconditionally trust the sanity of the BIOS provided physical_address_mask?

There's a warning comment on the kernel __ffs64() function:

 * The result is not defined if no bits are set, so check that @word
 * is non-zero before calling this.

Otherwise, this looks like a good idea.

-Tony