git: 310885b40ad2 - stable/15 - LinuxKPI: add __struct_size

The branch stable/15 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=310885b40ad256b054d65353c375b29700ee024c

commit 310885b40ad256b054d65353c375b29700ee024c
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2025-08-18 19:53:55 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2025-09-15 14:52:36 +0000

    LinuxKPI: add __struct_size
    
    Use __builtin_object_size() by default.
    If __builtin_dynamic_object_size() is available use that instead.
    
    I would hope that in a future version we can remove the conditional
    checks but in order to be able to MFC this without checking all
    compiler versions simply keep it this way for now.
    
    Sponsored by:   The FreeBSD Foundation (initially)
    Reviewed by:    dumbbell
    Differential Revision:  https://reviews.freebsd.org/D52077
    
    (cherry picked from commit ff5bcb742899f8398ccb1b9e292b2e5aeeb7fedb)
---
 sys/compat/linuxkpi/common/include/linux/compiler.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/compiler.h b/sys/compat/linuxkpi/common/include/linux/compiler.h
index fb5ad3bf4fe4..948396144ad6 100644
--- a/sys/compat/linuxkpi/common/include/linux/compiler.h
+++ b/sys/compat/linuxkpi/common/include/linux/compiler.h
@@ -130,4 +130,10 @@
 #define is_signed_type(t)	((t)-1 < (t)1)
 #define is_unsigned_type(t)	((t)-1 > (t)1)
 
+#if __has_builtin(__builtin_dynamic_object_size)
+#define	__struct_size(_s)	__builtin_dynamic_object_size(_s, 0)
+#else
+#define	__struct_size(_s)	__builtin_object_size(_s, 0)
+#endif
+
 #endif	/* _LINUXKPI_LINUX_COMPILER_H_ */