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Re: [PATCH 1/2] xen: make include/xen/unaligned.h usable on all architectures
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 12 Dec 2023 17:47:27 +0100
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- Cc: Wei Liu <wl@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 12 Dec 2023 16:48:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.12.2023 17:27, Juergen Gross wrote:
> Instead of defining get_unaligned() and put_unaligned() in a way that
> is only supporting architectures allowing unaligned accesses, use the
> same approach as the Linux kernel and let the compiler do the
> decision how to generate the code for probably unaligned data accesses.
>
> Update include/xen/unaligned.h from include/asm-generic/unaligned.h of
> the Linux kernel.
>
> The generated code has been checked to be the same on x86.
>
> Modify the Linux variant to not use underscore prefixed identifiers,
> avoid unneeded parentheses and drop the 24-bit accessors.
>
> Add the definition of __packed to xg_dom_decompress_unsafe_zstd.c in
> libxenguest as it is using a cruel hack to reuse the hypervisor's
> decompressing code for stubdom.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Origin: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> 803f4e1eab7a
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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