git: 2a8c50592f7f - main - LinuxKPI: add __counted_by() and __nonstring

The branch main has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=2a8c50592f7fce8bceedf004f674a5a9eae0fd46

commit 2a8c50592f7fce8bceedf004f674a5a9eae0fd46
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2024-04-02 09:41:54 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2024-04-15 19:31:49 +0000

    LinuxKPI: add __counted_by() and __nonstring
    
    Add checks for __counted_by(_x) and __nonstring as and depending
    on compiler support enable the attribute/feature.
    
    This is needed to make mtk76 and ath1xk drivers compile.
    
    Sposnored by:   The FreeBSD Foundation
    MFC after:      3 days
    Reviewed by:    emaste, dim
    Differential Revision: https://reviews.freebsd.org/D44587
---
 sys/compat/linuxkpi/common/include/linux/compiler.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/compiler.h b/sys/compat/linuxkpi/common/include/linux/compiler.h
index 1ae41d9ba641..d59e6faed12d 100644
--- a/sys/compat/linuxkpi/common/include/linux/compiler.h
+++ b/sys/compat/linuxkpi/common/include/linux/compiler.h
@@ -67,6 +67,17 @@
 #define	____cacheline_aligned_in_smp	__aligned(CACHE_LINE_SIZE)
 #define	fallthrough			/* FALLTHROUGH */ do { } while(0)
 
+#if __has_attribute(__nonstring__)
+#define	__nonstring			__attribute__((__nonstring__))
+#else
+#define	__nonstring
+#endif
+#if __has_attribute(__counted_by__)
+#define	__counted_by(_x)		__attribute__((__counted_by__(_x)))
+#else
+#define	__counted_by(_x)
+#endif
+
 #define	likely(x)			__builtin_expect(!!(x), 1)
 #define	unlikely(x)			__builtin_expect(!!(x), 0)
 #define typeof(x)			__typeof(x)