On Wed, May 09, 2018 at 12:59:42AM +1000, Michael Ellerman wrote: > From: Ram Pai <linuxram@xxxxxxxxxx> > > Currently only 4bits are allocated in the vma flags to hold 16 > keys. This is sufficient for x86. PowerPC supports 32 keys, > which needs 5bits. This patch allocates an additional bit. > > Reviewed-by: Ingo Molnar <mingo@xxxxxxxxxx> > Acked-by: Balbir Singh <bsingharora@xxxxxxxxx> > Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx> > [mpe: Fold in #if VM_PKEY_BIT4 as noticed by Dave Hansen] > Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > --- > fs/proc/task_mmu.c | 3 +++ > include/linux/mm.h | 3 ++- > 2 files changed, 5 insertions(+), 1 deletion(-) > > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c > index 541392a62608..c2163606e6fb 100644 > --- a/fs/proc/task_mmu.c > +++ b/fs/proc/task_mmu.c > @@ -679,6 +679,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) > [ilog2(VM_PKEY_BIT1)] = "", > [ilog2(VM_PKEY_BIT2)] = "", > [ilog2(VM_PKEY_BIT3)] = "", > +#if VM_PKEY_BIT4 > + [ilog2(VM_PKEY_BIT4)] = "", > +#endif > #endif /* CONFIG_ARCH_HAS_PKEYS */ > }; > size_t i; > diff --git a/include/linux/mm.h b/include/linux/mm.h > index c6a6f2492c1b..abfd758ff83a 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -231,9 +231,10 @@ extern unsigned int kobjsize(const void *objp); > #ifdef CONFIG_ARCH_HAS_PKEYS > # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 > # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ > -# define VM_PKEY_BIT1 VM_HIGH_ARCH_1 > +# define VM_PKEY_BIT1 VM_HIGH_ARCH_1 /* on x86 and 5-bit value on ppc64 */ > # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 > # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 > +# define VM_PKEY_BIT4 VM_HIGH_ARCH_4 > #endif /* CONFIG_ARCH_HAS_PKEYS */ this has to be: +#if defined(CONFIG_PPC) +# define VM_PKEY_BIT4 VM_HIGH_ARCH_4 +#else +# define VM_PKEY_BIT4 0 +#endif
