From: Leonid Yegoshin <Leonid.Yegoshin@xxxxxxxxxx> Patch removes eXecute bit in the page tables for HEAP/BSS. It boosts performance because page marked X is flushed each time after COW/swap from cache even for cache coherent systems in Harvard architectures (!cpu_has_ic_fills_f_dc). This patch also sets eXecute Inhibit (XI) protection of HEAP/BSS on CPUs which support it, like proAptiv cores. Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@xxxxxxxxxx> Signed-off-by: Steven J. Hill <Steven.Hill@xxxxxxxxxx> --- arch/mips/include/asm/page.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h index ec7b54d..b7f2c4e 100644 --- a/arch/mips/include/asm/page.h +++ b/arch/mips/include/asm/page.h @@ -233,7 +233,9 @@ extern int __virt_addr_valid(const volatile void *kaddr); #define virt_addr_valid(kaddr) \ __virt_addr_valid((const volatile void *) (kaddr)) -#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ +#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) +#define VM_STACK_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) -- 1.7.10.4
