| Date | Fri, 8 Mar 2019 13:33:05 -0600 | From | Josh Poimboeuf <> | Subject | Re: [PATCH 15/20] objtool: Add --backtrace support |
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On Thu, Mar 07, 2019 at 12:45:26PM +0100, Peter Zijlstra wrote: > For when you want to know the path that reached your fail state. > > $ ./objtool check --no-fp --backtrace arch/x86/lib/usercopy_64.o > arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0x3: UACCESS disable without MEMOPs: __clear_user() > arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x3a: (alt) > arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x2e: (branch) > arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x18: (branch) > arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0xffffffffffffffff: (branch) > arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x5: (alt) > arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x0: <=== (func)
We should have done this a long time ago. Thank you for this!
-- Josh
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