lkml.org 
[lkml]   [2020]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v6 6/8] powerpc/watchpoint: Add hw_len wherever missing
From
Date


On 9/2/20 1:29 AM, Ravi Bangoria wrote:
> There are couple of places where we set len but not hw_len. For
> ptrace/perf watchpoints, when CONFIG_HAVE_HW_BREAKPOINT=Y, hw_len
> will be calculated and set internally while parsing watchpoint.
> But when CONFIG_HAVE_HW_BREAKPOINT=N, we need to manually set
> 'hw_len'. Similarly for xmon as well, hw_len needs to be set
> directly.
>
> Fixes: b57aeab811db ("powerpc/watchpoint: Fix length calculation for unaligned target")
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Tested-by: Rogerio Alves <rcardoso@linux.ibm.com>
> ---
> arch/powerpc/kernel/ptrace/ptrace-noadv.c | 1 +
> arch/powerpc/xmon/xmon.c | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/arch/powerpc/kernel/ptrace/ptrace-noadv.c b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
> index c9122ed91340..48c52426af80 100644
> --- a/arch/powerpc/kernel/ptrace/ptrace-noadv.c
> +++ b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
> @@ -219,6 +219,7 @@ long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_inf
> brk.address = ALIGN_DOWN(bp_info->addr, HW_BREAKPOINT_SIZE);
> brk.type = HW_BRK_TYPE_TRANSLATE | HW_BRK_TYPE_PRIV_ALL;
> brk.len = DABR_MAX_LEN;
> + brk.hw_len = DABR_MAX_LEN;
> if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
> brk.type |= HW_BRK_TYPE_READ;
> if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
> diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
> index df7bca00f5ec..55c43a6c9111 100644
> --- a/arch/powerpc/xmon/xmon.c
> +++ b/arch/powerpc/xmon/xmon.c
> @@ -969,6 +969,7 @@ static void insert_cpu_bpts(void)
> brk.address = dabr[i].address;
> brk.type = (dabr[i].enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
> brk.len = 8;
> + brk.hw_len = 8;
> __set_breakpoint(i, &brk);
> }
> }
>

\
 
 \ /
  Last update: 2020-09-17 16:11    [W:0.184 / U:0.456 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site