git: ec504d3049a0 - stable/13 - linuxkpi: Add atomic64_fetch_add

The branch stable/13 has been updated by manu:

URL: https://cgit.FreeBSD.org/src/commit/?id=ec504d3049a06483ee441ef64318623caf7a5975

commit ec504d3049a06483ee441ef64318623caf7a5975
Author:     Emmanuel Vadot <manu@FreeBSD.org>
AuthorDate: 2022-02-16 09:44:55 +0000
Commit:     Emmanuel Vadot <manu@FreeBSD.org>
CommitDate: 2022-03-05 11:12:44 +0000

    linuxkpi: Add atomic64_fetch_add
    
    Linux variant of atomic_fetchadd_64.
    
    Reviewed by:    bz
    MFC after:      2 weeks
    Sponsored by:   Beckhoff Automation GmbH & Co. KG
    Differential Revision:  https://reviews.freebsd.org/D34296
    
    (cherry picked from commit 1889bed23debb2029970c0f8e79db6b622c3cb09)
---
 sys/compat/linuxkpi/common/include/asm/atomic64.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/asm/atomic64.h b/sys/compat/linuxkpi/common/include/asm/atomic64.h
index b53063620bb2..4ee0fa5ecf84 100644
--- a/sys/compat/linuxkpi/common/include/asm/atomic64.h
+++ b/sys/compat/linuxkpi/common/include/asm/atomic64.h
@@ -52,6 +52,12 @@ typedef struct {
 #define	atomic64_dec_return(v)		atomic64_sub_return(1, (v))
 #define	atomic64_inc_not_zero(v)	atomic64_add_unless((v), 1, 0)
 
+static inline int64_t
+atomic64_fetch_add(int64_t i, atomic64_t *v)
+{
+	return (atomic_fetchadd_64(&v->counter, i));
+}
+
 static inline int64_t
 atomic64_add_return(int64_t i, atomic64_t *v)
 {