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| author | Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> | 2018-01-23 16:50:43 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-02-22 15:31:24 +0100 |
| commit | 0b0d1173d8aef75e821c0cceedb0e8178834ec1b (patch) | |
| tree | eceecae57a15d49a22440434cc3aeb0ed0e97831 /drivers/s390/char/sclp.h | |
| parent | b843563518c1e06521c446b9a043b7d352df02e0 (diff) | |
| download | linux-0b0d1173d8aef75e821c0cceedb0e8178834ec1b.tar.gz linux-0b0d1173d8aef75e821c0cceedb0e8178834ec1b.tar.bz2 linux-0b0d1173d8aef75e821c0cceedb0e8178834ec1b.zip | |
s390/sclp: 32 bit event mask compatibility mode
Qemu before version 2.11 does not implement the architecture correctly,
and does not allow for a mask size of size different than 4.
This patch introduces a compatibility mode for such systems, forcing
the mask sizes to 4.
Since the mask size is currently still 4 anyway, this patch should have
no impact whatsoever by itself, but it will be needed when the mask size
is increased to 64 bits in the next patch.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/sclp.h')
| -rw-r--r-- | drivers/s390/char/sclp.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h index ee44d169f10f..45e6ffdc7f08 100644 --- a/drivers/s390/char/sclp.h +++ b/drivers/s390/char/sclp.h @@ -109,6 +109,8 @@ struct init_sccb { */ } __attribute__((packed)); +#define SCLP_MASK_SIZE_COMPAT 4 + static inline sccb_mask_t sccb_get_mask(u8 *masks, size_t len, int i) { sccb_mask_t res = 0; @@ -262,6 +264,7 @@ extern int sclp_init_state; extern int sclp_console_pages; extern int sclp_console_drop; extern unsigned long sclp_console_full; +extern bool sclp_mask_compat_mode; extern char sclp_early_sccb[PAGE_SIZE]; |