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mm: vmap: decrease wrps num [1/1]

Browse Source 
PD#SWPL-6813

Problem:
sys_ptrace watchpoint can't stop

Solution:
decrease wrps num

Verify:
u212

Change-Id: I18947bd91f8dd07cedeebbfca6d7ce01107c6a3e
Signed-off-by: Hanjie Lin <hanjie.lin@amlogic.com>
This commit is contained in:
Hanjie Lin
2019-04-15 10:14:37 +08:00
committed by Luke Go
parent c93f59a541
commit 802b47d3f8
1 changed files with 6 additions and 0 deletions
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6
arch/arm64/include/asm/hw_breakpoint.h
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@@ -159,9 +159,15 @@ static inline int get_num_brps(void)
static inline int get_num_wrps(void)
{
u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1);
#ifdef CONFIG_AMLOGIC_VMAP
return (1 +
cpuid_feature_extract_unsigned_field(dfr0,
ID_AA64DFR0_WRPS_SHIFT)) - 2;
#else
return 1 +
cpuid_feature_extract_unsigned_field(dfr0,
ID_AA64DFR0_WRPS_SHIFT);
#endif
}
#endif /* __KERNEL__ */