[PATCH v2 0/3] Switch get/put unaligned to use memcpy

[Ian Rogers]

The existing type punning approach with packed structs requires
 -fno-strict-aliasing to be passed to the compiler for
correctness. This is true in the kernel tree but not in the tools
directory resulting in this suggested patch from Eric Biggers
 <ebiggers@xxxxxxxxxx>:
https://lore.kernel.org/lkml/20250614044133.660848-2-ebiggers@xxxxxxxxxx/

Requiring -fno-strict-aliasing seems unfortunate and so this patch
makes the unaligned code work via memcpy for type punning rather than
the packed attribute.

v2: switch memcpy to __builtin_memcpy to avoid potential/disallowed
    memcpy calls in vdso caused by -fno-builtin. Reported by
    Christophe Leroy <christophe.leroy@xxxxxxxxxx>:
    https://lore.kernel.org/lkml/c57de5bf-d55c-48c5-9dfa-e2fb844dafe9@xxxxxxxxxx/

Ian Rogers (3):
  vdso: Switch get/put unaligned from packed struct to memcpy
  tools headers: Update the linux/unaligned.h copy with the kernel
    sources
  tools headers: Remove unneeded ignoring of warnings in unaligned.h

 include/vdso/unaligned.h        | 48 ++++++++++++++++++++++++++++-----
 tools/include/linux/unaligned.h |  4 ---
 tools/include/vdso/unaligned.h  | 48 ++++++++++++++++++++++++++++-----
 3 files changed, 84 insertions(+), 16 deletions(-)

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2.50.0.rc2.701.gf1e915cc24-goog