git: 584bd868b4e4 - stable/13 - LinuxKPI: fix WRITE_ONCE()

The branch stable/13 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=584bd868b4e41ae909fa0a51bc969be567272427

commit 584bd868b4e41ae909fa0a51bc969be567272427
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2023-05-13 15:17:47 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2023-06-26 09:11:49 +0000

    LinuxKPI: fix WRITE_ONCE()
    
    Fix a gcc warning: "to be safe all intermediate pointers in cast from
    '...' to '...' must be 'const' qualified [-Wcast-qual]".
    Doing what is essentially a __DECONST() adding the uintptr_t gets
    rid of the massive amount of warnings we get in LinuxKPI and lets
    us see the actual problems a lot better.
    This is a follow-up to 74e908b3c63b28de1d590dc42502fbe959a6da2e which
    fixed READ_ONCE().
    
    Sponsored by:   The FreeBSD Foundation
    Suggested by:   jhb
    Reviewed by:    hselasky
    Differential Revision: https://reviews.freebsd.org/D40084
    
    (cherry picked from commit 046d8d89ed1956944b12ec4f0580c30bc202bbfb)
---
 sys/compat/linuxkpi/common/include/linux/compiler.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/compat/linuxkpi/common/include/linux/compiler.h b/sys/compat/linuxkpi/common/include/linux/compiler.h
index 801618e15f9f..a918b6b76371 100644
--- a/sys/compat/linuxkpi/common/include/linux/compiler.h
+++ b/sys/compat/linuxkpi/common/include/linux/compiler.h
@@ -91,7 +91,7 @@
 
 #define	WRITE_ONCE(x,v) do {		\
 	barrier();			\
-	ACCESS_ONCE(x) = (v);		\
+	(*(volatile __typeof(x) *)(uintptr_t)&(x)) = (v); \
 	barrier();			\
 } while (0)