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Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault

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On August 22, 2016 4:48:00 PM PDT, Linus Torvalds <torvalds@linux-foundation.org> wrote:
>On Mon, Aug 22, 2016 at 4:12 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>>
>> How about the gcc native __builtin_setjmp stuff which is supposedly
>better?
>
>How new is it? The whole point was that we'd not have to worry and
>wait for gcc features..
>
>glibc doesn't use it, which worries me a bit. Has it ever gotten any
>use/testing?
>
>But yes, the compiler could do better. If we can rely on it, and it
>doesn't do stupid things (like have signal state etc crap - glibc
>seems to just alias "setjmp" to "sigsetjmp" with a "didn't save
>signals" flag)
>
>             Linus

We can always fall back on the classic implementation for older gcc, just like we do for so many other features.
-- 
Sent from my Android device with K-9 Mail. Please excuse brevity and formatting.

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[PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-08-19 21:20 +0200
  Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-19 23:30 +0200
    Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-20 00:10 +0200
      Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-20 00:20 +0200
        Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-21 01:40 +0200
          Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-21 02:20 +0200
            Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-21 02:50 +0200
              Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-21 03:10 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-21 03:10 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-21 03:50 +0200
              Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Jakub Jelinek <jakub@redhat.com> - 2016-08-21 07:00 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-21 08:50 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-21 20:00 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-23 00:30 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-23 01:20 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-23 01:50 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of  fault David Miller <davem@davemloft.net> - 2016-08-23 02:00 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-23 02:10 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-23 02:00 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-23 02:20 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-23 01:20 +0200

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