On 8/23/2022 9:51 AM, Borislav Petkov wrote: > On Tue, Aug 02, 2022 at 01:50:53PM -0600, Jane Chu wrote: >> With Commit 7917f9cdb503 ("acpi/nfit: rely on mce->misc to determine >> poison granularity") that changed nfit_handle_mce() callback to report >> badrange according to 1ULL << MCI_MISC_ADDR_LSB(mce->misc), it's been >> discovered that the mce->misc LSB field is 0x1000 bytes, hence injecting >> 2 back-to-back poisons and the driver ends up logging 8 badblocks, >> because 0x1000 bytes is 8 512-byte. > > What I'm missing from this text here is, what *is* the mce->misc LSB > field in human speak? What does that field denote? > > What effect does that field have on error injection Tony has replied.
> > And so on. > >> Dan Williams noticed that apei_mce_report_mem_error() hardcode >> the LSB field to PAGE_SHIFT instead of consulting the input >> struct cper_sec_mem_err record. So change to rely on hardware whenever >> support is available. > > Rely on hardware? You're changing this to rely on what the firmware > reports. > > That mem_err thing comes from a BIOS table AFAICT. > Would fix the comment to indicate "relying on firmware" help? Is there other concern? thanks! -jane > ... > > Thx. >