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mm: disable FAULT_FLAG_SPECULATIVE. [1/2]

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PD#SWPL-94445

Problem:
play video system crash.

Solution:
disable FAULT_FLAG_SPECULATIVE.

Verify:
sc2_ah212.

Change-Id: Ib056ffe1f48e68ae8e7b848c23db8218710fbbb7
Signed-off-by: Jianxiong Pan <jianxiong.pan@amlogic.com>
This commit is contained in:
Jianxiong Pan
2022-10-10 21:00:09 +08:00
committed by Dongjin Kim
parent 473137409a
commit 0f59e46198
1 changed files with 6 additions and 0 deletions
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6
arch/arm64/mm/fault.c
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@@ -551,10 +551,12 @@ static int __kprobes do_page_fault(unsigned long far, unsigned long esr,
unsigned long vm_flags;
unsigned int mm_flags = FAULT_FLAG_DEFAULT;
unsigned long addr = untagged_addr(far);
#ifndef CONFIG_AMLOGIC_CMA
#ifdef CONFIG_SPECULATIVE_PAGE_FAULT
struct vm_area_struct *vma;
struct vm_area_struct pvma;
unsigned long seq;
#endif
#endif
if (kprobe_page_fault(regs, esr))
@@ -613,6 +615,7 @@ static int __kprobes do_page_fault(unsigned long far, unsigned long esr,
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr);
#ifndef CONFIG_AMLOGIC_CMA
#ifdef CONFIG_SPECULATIVE_PAGE_FAULT
/*
* No need to try speculative faults for kernel or
@@ -665,6 +668,7 @@ spf_abort:
no_spf:
#endif /* CONFIG_SPECULATIVE_PAGE_FAULT */
#endif
/*
* As per x86, we may deadlock here. However, since the kernel only
@@ -706,8 +710,10 @@ retry:
}
}
mmap_read_unlock(mm);
#ifndef CONFIG_AMLOGIC_CMA
#ifdef CONFIG_SPECULATIVE_PAGE_FAULT
done:
#endif
#endif
/*