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SubjectRe: [REVIEW][PATCH 09/22] signal/nds32: Use force_sig_fault where appropriate
Vincent Chen <deanbo422@gmail.com> writes:

> 2018-04-20 22:37 GMT+08:00 Eric W. Biederman <ebiederm@xmission.com>:
>> Filling in struct siginfo before calling force_sig_info a tedious and
>> error prone process, where once in a great while the wrong fields
>> are filled out, and siginfo has been inconsistently cleared.
>>
>> Simplify this process by using the helper force_sig_fault. Which
>> takes as a parameters all of the information it needs, ensures
>> all of the fiddly bits of filling in struct siginfo are done properly
>> and then calls force_sig_info.
>>
>> In short about a 5 line reduction in code for every time force_sig_info
>> is called, which makes the calling function clearer.
>>
>> Cc: Greentime Hu <green.hu@gmail.com>
>> Cc: Vincent Chen <deanbo422@gmail.com>
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>> ---
>> arch/nds32/kernel/traps.c | 20 ++++----------------
>> arch/nds32/mm/fault.c | 19 +++++--------------
>> 2 files changed, 9 insertions(+), 30 deletions(-)
>>
>> diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
>> index 46911768f4b5..636d1c7aa895 100644
>> --- a/arch/nds32/kernel/traps.c
>> +++ b/arch/nds32/kernel/traps.c
>> @@ -222,20 +222,13 @@ void die_if_kernel(const char *str, struct pt_regs *regs, int err)
>>
>> int bad_syscall(int n, struct pt_regs *regs)
>> {
>> - siginfo_t info;
>> -
>> if (current->personality != PER_LINUX) {
>> send_sig(SIGSEGV, current, 1);
>> return regs->uregs[0];
>> }
>>
>> - clear_siginfo(&info);
>> - info.si_signo = SIGILL;
>> - info.si_errno = 0;
>> - info.si_code = ILL_ILLTRP;
>> - info.si_addr = (void __user *)instruction_pointer(regs) - 4;
>> -
>> - force_sig_info(SIGILL, &info, current);
>> + force_sig_fault(SIGILL, ILL_ILLTRP,
>> + (void __user *)instruction_pointer(regs) - 4, current);
>> die_if_kernel("Oops - bad syscall", regs, n);
>> return regs->uregs[0];
>> }
>> @@ -288,16 +281,11 @@ void __init early_trap_init(void)
>> void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
>> int error_code, int si_code)
>> {
>> - struct siginfo info;
>> -
>> tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
>> tsk->thread.error_code = error_code;
>>
>> - clear_siginfo(&info);
>> - info.si_signo = SIGTRAP;
>> - info.si_code = si_code;
>> - info.si_addr = (void __user *)instruction_pointer(regs);
>> - force_sig_info(SIGTRAP, &info, tsk);
>> + force_sig_fault(SIGTRAP, si_code
>> + (void __user *)instruction_pointer(regs), tsk);
>> }
>>
>
> I found a comma is missing after argument si_code.

Good catch. Fixed.

Unfortunately the only compiler I have for nds32 is my eyeballs so
this slipped through. Grr.


> Except the missing comma in send_sigtrap(), I think this patch for nds32 is OK.
>

I have corrected the change as you suggested and have added your Acked
by.

Eric

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