[Qemu-devel] [PATCH 0/3] block: fix last address-of-packed-member warnings

[Peter Maydell <peter.maydell@linaro.org>]

This patchset fixes the remaining clang warnings in the block/ code
about taking the address of a packed struct member, which are all
in block/vpc and block/vdi code handling UUIDs. Mostly I fix
these by copying the unaligned field to/from a local variable.
In the case of qemu_uuid_bswap() I opted to change the API to
take and return the QemuUUID rather than taking a pointer to it,
which makes almost all the callsites simpler. This does mean
a struct copy but the struct is only 16 bytes and I didn't
judge any of the callsites performance-sensitive enough to care
about a struct copy of that size.

As usual, tested with "make check" only.

thanks
-- PMM


Peter Maydell (3):
  block/vpc: Don't take address of fields in packed structs
  block/vdi: Don't take address of fields in packed structs
  uuid: Make qemu_uuid_bswap() take and return a QemuUUID

 include/qemu/uuid.h  |  2 +-
 block/vdi.c          | 54 +++++++++++++++++++++++++++-----------------
 block/vpc.c          |  4 +++-
 hw/acpi/vmgenid.c    |  6 ++---
 tests/vmgenid-test.c |  2 +-
 util/uuid.c          | 10 ++++----
 6 files changed, 45 insertions(+), 33 deletions(-)

-- 
2.19.2