[PATCH v3 25/34] s390/diag: Unpoison diag224() output buffer

[Ilya Leoshkevich]

Diagnose 224 stores 4k bytes, which cannot be deduced from the inline
assembly constraints. This leads to KMSAN false positives.

Unpoison the output buffer manually with kmsan_unpoison_memory().

Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
---
 arch/s390/kernel/diag.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c
index 92fdc35f028c..fb83a21014d0 100644
--- a/arch/s390/kernel/diag.c
+++ b/arch/s390/kernel/diag.c
@@ -9,6 +9,7 @@
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/cpu.h>
+#include <linux/kmsan-checks.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/vmalloc.h>
@@ -255,6 +256,7 @@ int diag224(void *ptr)
 		"1:\n"
 		EX_TABLE(0b,1b)
 		: "+d" (rc) :"d" (0), "d" (addr) : "memory");
+	kmsan_unpoison_memory(ptr, PAGE_SIZE);
 	return rc;
 }
 EXPORT_SYMBOL(diag224);
-- 
2.43.0