On Wed, 7 Apr 2021 at 19:54, Alex Bennée <alex.ben...@linaro.org> wrote: > > > Richard Henderson <richard.hender...@linaro.org> writes: > > > We were incorrectly assuming that only the first byte of an MTE access > > is checked against the tags. But per the ARM, unaligned accesses are > > pre-decomposed into single-byte accesses. So by the time we reach the > > actual MTE check in the ARM pseudocode, all accesses are aligned. > > > > Therefore, the first failure is always either the first byte of the > > access, or the first byte of the granule. > > > > In addition, some of the arithmetic is off for last-first -> count. > > This does not become directly visible until a later patch that passes > > single bytes into this function, so ptr == ptr_last. > > > > Buglink: https://bugs.launchpad.net/bugs/1921948 > > Minor note: you can Cc: Bug 1921948 <1921...@bugs.launchpad.net> to > automatically copy patches to the appropriate bugs which is useful if > you don't have the Cc for the reporter.
I'm not sure cc'ing bugs on patches is very useful, though (and especially not for big series). I usually prefer to just add a note to the bug with the URL of the series in patchew afterwards. -- PMM
