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s390: move on_thread_stack() to processor.h

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As preparation for the stackleak feature move on_thread_stack() to
processor.h like x86.

Also make it __always_inline, and slightly optimize it by reading
current task's kernel stack pointer from lowcore.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
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 2023-03-27 11:37:27 +02:00 committed by Vasily Gorbik
parent 60afa6d166
commit 22ca1e7738
2 changed files with 7 additions and 5 deletions
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5
arch/s390/include/asm/entry-common.h
View File

@ -60,9 +60,4 @@ static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
#define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare
static inline bool on_thread_stack(void)
{
return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1));
}
#endif

7
arch/s390/include/asm/processor.h
View File

@ -226,6 +226,13 @@ static __always_inline unsigned long __current_stack_pointer(void)
return sp;
}
static __always_inline bool on_thread_stack(void)
{
unsigned long ksp = S390_lowcore.kernel_stack;
return !((ksp ^ current_stack_pointer) & ~(THREAD_SIZE - 1));
}
static __always_inline unsigned short stap(void)
{
unsigned short cpu_address;