x86, threadinfo: Redo "x86: Use inline assembler to get sp"
This patch restores the changes of commit dff38e3e "x86: Use inline assembler instead of global register variable to get sp". They got lost in commit 198d208d "x86: Keep thread_info on thread stack in x86_32" while moving the code to arch/x86/kernel/irq_32.c. Quoting Andi from commit dff38e3e: """ LTO in gcc 4.6/47. has trouble with global register variables. They were used to read the stack pointer. Use a simple inline assembler statement with a mov instead. This also helps LLVM/clang, which does not support global register variables. """ Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Andi Kleen <ak@linux.intel.com> Signed-off-by: NMathias Krause <minipli@googlemail.com> Link: http://lkml.kernel.org/r/1394178752-18047-1-git-send-email-minipli@googlemail.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>
Showing
想要评论请 注册 或 登录