leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

s390/traps: get rid of magic cast for per code

Browse Source 
Add a proper union in lowcore to reflect architecture and get rid of a
"magic" cast in order to read the full per code.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2022-03-06 10:59:05 +01:00 committed by Vasily Gorbik
parent 52b739e278
commit 998e78004f
2 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/s390/include/asm/lowcore.h
View File

@ -43,8 +43,13 @@ struct lowcore {
};
__u32 data_exc_code; /* 0x0090 */
__u16 mon_class_num; /* 0x0094 */
__u8 per_code; /* 0x0096 */
__u8 per_atmid; /* 0x0097 */
union {
struct {
__u8 per_code; /* 0x0096 */
__u8 per_atmid; /* 0x0097 */
};
__u16 per_code_combined;
};
__u64 per_address; /* 0x0098 */
__u8 exc_access_id; /* 0x00a0 */
__u8 per_access_id; /* 0x00a1 */

2
arch/s390/kernel/traps.c
View File

@ -322,7 +322,7 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
set_thread_flag(TIF_PER_TRAP);
ev->address = S390_lowcore.per_address;
ev->cause = *(u16 *)&S390_lowcore.per_code;
ev->cause = S390_lowcore.per_code_combined;
ev->paid = S390_lowcore.per_access_id;
} else {
/* PER event in kernel is kprobes */