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s390/ptrace: PTRACE_TE_ABORT_RAND

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The patch implements a s390 specific ptrace request
PTRACE_TE_ABORT_RAND to modify the randomness of spontaneous
aborts of memory transactions of the transaction execution
facility. The data argument of the ptrace request is used to
specify the levels of randomness, 0 for normal operation, 1 to
abort every transaction at a random instruction, and 2 to abort
a random transaction at a random instruction. The default is 0
for normal operation.

Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Mueller
2013-07-02 22:58:26 +02:00
committed by Martin Schwidefsky
parent 47188d39b5
commit 64597f9dae
4 changed files with 51 additions and 14 deletions
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4
arch/s390/include/asm/switch_to.h
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@@ -10,7 +10,7 @@
#include <linux/thread_info.h>
extern struct task_struct *__switch_to(void *, void *);
extern void update_per_regs(struct task_struct *task);
extern void update_cr_regs(struct task_struct *task);
static inline void save_fp_regs(s390_fp_regs *fpregs)
{
@@ -86,7 +86,7 @@ static inline void restore_access_regs(unsigned int *acrs)
restore_fp_regs(&next->thread.fp_regs); \
restore_access_regs(&next->thread.acrs[0]); \
restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
update_per_regs(next); \
update_cr_regs(next); \
} \
prev = __switch_to(prev,next); \
} while (0)