On Tue, 2015-01-20 at 10:57 +0100, Christophe Leroy wrote: > By default, TASK_SIZE is set to 0x80000000 for PPC_8xx, which is most likely > sufficient for most cases. However, kernel configuration allows to set > TASK_SIZE > to another value, so the 8xx shall handle it. > > Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> > > --- > v2: no change > > arch/powerpc/kernel/head_8xx.S | 25 +++++++++++++++++++------ > 1 file changed, 19 insertions(+), 6 deletions(-) > > diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S > index ead6448..92a6456 100644 > --- a/arch/powerpc/kernel/head_8xx.S > +++ b/arch/powerpc/kernel/head_8xx.S > @@ -48,6 +48,19 @@ > mtspr spr, reg > #endif > > +/* Macro to test if an address is a kernel address */ > +#if CONFIG_TASK_SIZE <= 0x80000000 > +#define IS_KERNEL(tmp, addr) \ > + andis. tmp, addr, 0x8000 /* Address >= 0x80000000 */ > +#define BRANCH_UNLESS_KERNEL(label) beq label > +#else
This works if CONFIG_TASK_SIZE == 0x80000000, but what if it's less, and you have a kernel address < 0x80000000? -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
