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4c881ca181
This patch fixes a bug of change_page_attr/change_page_attr_addr on Intel i386/x86_64 CPUs. After changing page attribute to be executable with these functions, the page remains un-executable on Intel i386/x86_64 CPU. Because on Intel i386/x86_64 CPU, only if the "NX" bits of all three level page tables are cleared (PAE is enabled), the corresponding page is executable (refer to section 4.13.2 of Intel 64 and IA-32 Architectures Software Developer's Manual). So, the bug is fixed through clearing the "NX" bit of PMD when splitting the huge PMD. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
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