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The setup_smep function gets calle at resume time too, and is thus not a pure __init function. When marked as __init, it gets thrown out after the kernel has initialized, and when the kernel is suspended and resumed, the code will no longer be around, and we'll get a nice "kernel tried to execute NX-protected page" oops because the page is no longer marked executable. Reported-and-tested-by: Parag Warudkar <parag.lkml@gmail.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: "H. Peter Anvin" <hpa@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>