https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237940
Bug ID: 237940
Summary: struct nvme_health_information_page{} @
/usr/include/dev/nvme/nvme.h has alignment issues.
Product: Base System
Version: 12.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: root+free...@linuxpedia.pl
struct nvme_health_information_page {
uint8_t critical_warning;
uint16_t temperature;
uint8_t available_spare;
/* ... */
} __packed __aligned(4);
has issues with alignment: `temperature` field can't be properly aligned on any
current architecture which seems to defeat the `__aligned(4)` hint.
What has bitten me today is that it confuses some code-generating tools, like
Rust's bindgen. I already filed a bug to them, as they treat __packed
__aligned(4) as __packed(4) - which has a *totally* different meaning - but it
would be nice to have some BSD compiler guru took a glimpse at this particular
structure and shed some light on whether __aligned(4) is OK here.
And yes, I know this structure layout is not BSD's idea ¯\_(ツ)_/¯
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