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s390: stack address vs thread_info 

Avoid using the address of a process' thread_info structure as the
kernel stack address. This will break as soon as the thread_info
structure will be removed from the stack, and in addition it makes the
code a bit more understandable.

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 2016-06-27 07:57:21 +02:00 committed by Martin Schwidefsky
parent 43799597dc
commit c3bdf2e11a
2 changed files with 6 additions and 10 deletions
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4
arch/s390/include/asm/kprobes.h
View File

@ -43,9 +43,9 @@ typedef u16 kprobe_opcode_t;
#define MAX_INSN_SIZE 0x0003
#define MAX_STACK_SIZE 64
#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
(((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
(((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \
? (MAX_STACK_SIZE) \
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
: (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR)))
#define kretprobe_blacklist_size 0

12
arch/s390/kernel/dumpstack.c
View File

@ -78,14 +78,10 @@ void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
sp = __dump_trace(func, data, sp,
S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
S390_lowcore.async_stack + frame_size);
if (task)
__dump_trace(func, data, sp,
(unsigned long)task_stack_page(task),
(unsigned long)task_stack_page(task) + THREAD_SIZE);
else
__dump_trace(func, data, sp,
S390_lowcore.thread_info,
S390_lowcore.thread_info + THREAD_SIZE);
task = task ?: current;
__dump_trace(func, data, sp,
(unsigned long)task_stack_page(task),
(unsigned long)task_stack_page(task) + THREAD_SIZE);
}
EXPORT_SYMBOL_GPL(dump_trace);