lkml.org 
[lkml]   [2023]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip: locking/core] s390/cpum_sf: Convert to cmpxchg128()
The following commit has been merged into the locking/core branch of tip:

Commit-ID: 71af29d0671b5bd38846176fb48f31152a026925
Gitweb: https://git.kernel.org/tip/71af29d0671b5bd38846176fb48f31152a026925
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Mon, 15 May 2023 09:57:10 +02:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Fri, 19 May 2023 12:35:15 +02:00

s390/cpum_sf: Convert to cmpxchg128()

Now that there is a cross arch u128 and cmpxchg128(), use those
instead of the custom CDSG helper.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20230515080554.657068280@infradead.org
---
arch/s390/include/asm/cpu_mf.h | 2 +-
arch/s390/kernel/perf_cpum_sf.c | 16 +++-------------
2 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/arch/s390/include/asm/cpu_mf.h b/arch/s390/include/asm/cpu_mf.h
index 7e417d7..a0de5b9 100644
--- a/arch/s390/include/asm/cpu_mf.h
+++ b/arch/s390/include/asm/cpu_mf.h
@@ -140,7 +140,7 @@ union hws_trailer_header {
unsigned int dsdes:16; /* 48-63: size of diagnostic SDE */
unsigned long long overflow; /* 64 - Overflow Count */
};
- __uint128_t val;
+ u128 val;
};

struct hws_trailer_entry {
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 7ef72f5..8ecfbce 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -1271,16 +1271,6 @@ static void hw_collect_samples(struct perf_event *event, unsigned long *sdbt,
}
}

-static inline __uint128_t __cdsg(__uint128_t *ptr, __uint128_t old, __uint128_t new)
-{
- asm volatile(
- " cdsg %[old],%[new],%[ptr]\n"
- : [old] "+d" (old), [ptr] "+QS" (*ptr)
- : [new] "d" (new)
- : "memory", "cc");
- return old;
-}
-
/* hw_perf_event_update() - Process sampling buffer
* @event: The perf event
* @flush_all: Flag to also flush partially filled sample-data-blocks
@@ -1352,7 +1342,7 @@ static void hw_perf_event_update(struct perf_event *event, int flush_all)
new.f = 0;
new.a = 1;
new.overflow = 0;
- prev.val = __cdsg(&te->header.val, old.val, new.val);
+ prev.val = cmpxchg128(&te->header.val, old.val, new.val);
} while (prev.val != old.val);

/* Advance to next sample-data-block */
@@ -1562,7 +1552,7 @@ static bool aux_set_alert(struct aux_buffer *aux, unsigned long alert_index,
}
new.a = 1;
new.overflow = 0;
- prev.val = __cdsg(&te->header.val, old.val, new.val);
+ prev.val = cmpxchg128(&te->header.val, old.val, new.val);
} while (prev.val != old.val);
return true;
}
@@ -1636,7 +1626,7 @@ static bool aux_reset_buffer(struct aux_buffer *aux, unsigned long range,
new.a = 1;
else
new.a = 0;
- prev.val = __cdsg(&te->header.val, old.val, new.val);
+ prev.val = cmpxchg128(&te->header.val, old.val, new.val);
} while (prev.val != old.val);
*overflow += orig_overflow;
}
\
 
 \ /
  Last update: 2023-05-20 12:50    [W:0.201 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site