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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180507024909.5598-4-zackw@panix.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit On 06/05/2018 23:49, Zack Weinberg wrote: > On 26 Feb 2018, Adhemerval Zanella wrote: >> This patches adds the x86_64 modification required for the BZ#12683. >> It basically provide the required ucontext_get_pc symbol and remove >> the arch-specific libc-cancellation implementations. > > These changes all look fine to me. > >> lock;orl $4, %fs:776 >> >> Where with patch changes it now compiles to: >> >> mov %fs:16,%rax >> lock;orl $4, 776(%rax) > > That might actually be faster on some microarchitectures due to not > having multiple unusual prefixes on one instruction. I wouldn't worry > about it. > >> In fact all x86_64 THREAD_ATOMIC_* macros >> do not respect the input descr and possible will fail when used with >> a 'descr' difference than THREAD_SELF. > > Maybe we should correct or remove all of them, then? They sound like > they're bugs waiting to happen. > > zw > Right, I will fix in on an extra patch then.