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Re: [PATCH v2 2/3] xen: make include/xen/unaligned.h usable on all architectures
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 6 Dec 2023 11:02:13 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 06 Dec 2023 10:02:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.12.23 09:46, Jan Beulich wrote:
On 06.12.2023 08:10, 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.
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>
Nevertheless ...
@@ -15,67 +7,82 @@
#include <asm/byteorder.h>
#endif
-#define get_unaligned(p) (*(p))
-#define put_unaligned(val, p) (*(p) = (val))
+/*
+ * This is the most generic implementation of unaligned accesses
+ * and should work almost anywhere.
+ */
+
+#define get_unaligned_t_(type, ptr) ({ \
..., do we need the trailing underscores here in addition to the already
sufficiently clear _t suffixes? (Leaving aside that ..._t generally is to
denote types, not macros or functions.)
Maybe we should just name it get_unaligned_type()?
Juergen
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