s390/pai: Calculate size of reserved PAI extension control block area

The PAI extension 1 control block area is 512 bytes in total.
It currently contains three address pointer which refer to counter
memory blocks followed by a reserved area.
Calculate the reserved area instead of hardcoding its size. This
makes the code more readable and maintainable.
No functional chance.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Suggested-by: Jan Polensky <japo@linux.ibm.com>
Reviewed-by: Jan Polensky <japo@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/kernel/perf_pai.c b/arch/s390/kernel/perf_pai.c
index 1fac41a0aa091fd44ae349cc224e6b9b16acf404..c79864628582c52d055a7771791c8fb51185a567 100644 (file)
--- a/arch/s390/kernel/perf_pai.c
+++ b/arch/s390/kernel/perf_pai.c
@@ -48,7 +48,7 @@ struct paiext_cb {            /* PAI extension 1 control block */
        u64 header;             /* Not used */
        u64 reserved1;
        u64 acc;                /* Addr to analytics counter control block */
-       u8 reserved2[488];
+       u8 reserved2[PAIE1_CTRBLOCK_SZ - 3 * sizeof(u64)];
 } __packed;
 
 struct pai_map {