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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_KMSAN_H
#define _ASM_S390_KMSAN_H
#include <asm/lowcore.h>
#include <asm/page.h>
#include <linux/kmsan.h>
#include <linux/mmzone.h>
#include <linux/stddef.h>
#ifndef MODULE
static inline bool is_lowcore_addr(void *addr)
{
return addr >= (void *)get_lowcore() &&
addr < (void *)(get_lowcore() + 1);
}
static inline void *arch_kmsan_get_meta_or_null(void *addr, bool is_origin)
{
if (is_lowcore_addr(addr)) {
/*
* Different lowcores accessed via S390_lowcore are described
* by the same struct page. Resolve the prefix manually in
* order to get a distinct struct page.
*/
addr += (void *)lowcore_ptr[raw_smp_processor_id()] -
(void *)get_lowcore();
if (KMSAN_WARN_ON(is_lowcore_addr(addr)))
return NULL;
return kmsan_get_metadata(addr, is_origin);
}
return NULL;
}
static inline bool kmsan_virt_addr_valid(void *addr)
{
bool ret;
/*
* pfn_valid() relies on RCU, and may call into the scheduler on exiting
* the critical section. However, this would result in recursion with
* KMSAN. Therefore, disable preemption here, and re-enable preemption
* below while suppressing reschedules to avoid recursion.
*
* Note, this sacrifices occasionally breaking scheduling guarantees.
* Although, a kernel compiled with KMSAN has already given up on any
* performance guarantees due to being heavily instrumented.
*/
preempt_disable();
ret = virt_addr_valid(addr);
preempt_enable_no_resched();
return ret;
}
#endif /* !MODULE */
#endif /* _ASM_S390_KMSAN_H */
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