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[v3,07/13] xen/include: import sizeof_field() macro from Linux stddef.h

Message ID 20201124190744.11343-8-paul@xen.org (mailing list archive)
State New, archived
Headers show
Series viridian: add support for ExProcessorMasks... | expand

Commit Message

Paul Durrant Nov. 24, 2020, 7:07 p.m. UTC 
From: Paul Durrant <pdurrant@amazon.com>

Co-locate it with the definition of offsetof() (since this is also in stddef.h
in the Linux kernel source). This macro will be needed in a subsequent patch.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <george.dunlap@citrix.com>
Cc: Ian Jackson <iwj@xenproject.org>
Cc: Julien Grall <julien@xen.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Wei Liu <wl@xen.org>
---
 xen/include/xen/compiler.h | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h
index c0e0ee9f27be..676c6ea1b0a0 100644
--- a/xen/include/xen/compiler.h
+++ b/xen/include/xen/compiler.h
@@ -76,6 +76,14 @@ 
 
 #define offsetof(a,b) __builtin_offsetof(a,b)
 
+/**
+ * sizeof_field(TYPE, MEMBER)
+ *
+ * @TYPE: The structure containing the field of interest
+ * @MEMBER: The field to return the size of
+ */
+#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
+
 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
 #define alignof __alignof__
 #endif