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s390/sclp: avoid potential usage of uninitialized value

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sclp_early_printk could be used before .bss section is zeroed
(i.e. from als.c during the decompressor phase), therefore values used
by sclp_early_printk should be located in the .data section.

Another reason for that is to avoid potential initrd corruption, if some
code in future would use sclp_early_printk before initrd is moved from
possibly overlapping with .bss section region to a safe location.

Fixes: 0b0d1173d8 ("s390/sclp: 32 bit event mask compatibility mode")
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2018-04-13 18:22:14 +02:00 committed by Martin Schwidefsky
parent 60cc43fc88
commit dccccd332d
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/char/sclp_early_core.c
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@ -18,7 +18,7 @@ int sclp_init_state __section(.data) = sclp_init_state_uninitialized;
* Used to keep track of the size of the event masks. Qemu until version 2.11
* only supports 4 and needs a workaround.
*/
bool sclp_mask_compat_mode;
bool sclp_mask_compat_mode __section(.data);
void sclp_early_wait_irq(void)
{