xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

s390/sclp: make early sclp code readable

Browse Source 
This patch

 - unifies the old sclp early code and the sclp early printk code, so
   they can use common functions

 - makes sure all sclp early functions and variables have the same
   "sclp_early" prefix

 - converts the sclp early printk code into readable code by using
   existing data structures instead of hard coded magic arrays

 - splits the early sclp code into two files: sclp_early.c and
   sclp_early_core.c. The core file contains everything that is
   required by the kernel decompressor and may not call functions not
   contained within the core file. Otherwise the result would be a
   link error.

 - changes interrupt handling to be completely synchronous. The old
   early sclp code had a small window which allowed to receive several
   interrupts instead of exactly the single expected interrupt. This
   did hide a subtle potential bug, which is fixed with this large
   rework.

 - contains a couple of small cleanups.

Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.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:
Heiko Carstens
2017-01-24 15:58:52 +01:00
committed by Martin Schwidefsky
parent 76fdf1416e
commit d5ab7a34f9
10 changed files with 245 additions and 296 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
arch/s390/kernel/als.c
View File

@@ -41,7 +41,7 @@ static void __init print_machine_type(void)
get_cpu_id(&id);
u16_to_hex(type_str, id.machine);
strcat(mach_str, type_str);
_sclp_print_early(mach_str);
sclp_early_printk(mach_str);
}
static void __init u16_to_decimal(char *str, u16 val)
@@ -79,7 +79,7 @@ static void __init print_missing_facilities(void)
* z/VM adds a four character prefix.
*/
if (strlen(als_str) > 70) {
_sclp_print_early(als_str);
sclp_early_printk(als_str);
*als_str = '\0';
}
u16_to_decimal(val_str, i * BITS_PER_LONG + j);
@@ -87,13 +87,13 @@ static void __init print_missing_facilities(void)
first = 0;
}
}
_sclp_print_early(als_str);
_sclp_print_early("See Principles of Operations for facility bits");
sclp_early_printk(als_str);
sclp_early_printk("See Principles of Operations for facility bits");
}
static void __init facility_mismatch(void)
{
_sclp_print_early("The Linux kernel requires more recent processor hardware");
sclp_early_printk("The Linux kernel requires more recent processor hardware");
print_machine_type();
print_missing_facilities();
disabled_wait(0x8badcccc);