Am Samstag, 9. April 2016, 08:26:14 schrieb Helge Deller: > This patch simplifies the code for get_user() and put_user() a lot. > > Instead of accessing kernel memory (%sr0) and userspace memory (%sr3) > hard-coded in the assembler instruction, we now preload %sr2 with either > %sr0 (for accessing KERNEL_DS) or with sr3 (to access USER_DS) and > use %sr2 in the load directly. > > The generated code avoids a branch and speeds up execution by generating > less assembler instructions. I have put this on my C3600 (Linux 4.5.0, 32 bit kernel) and I see no negative effects. Eike
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