Re: [PATCH v2 29/35] powerpc/perf: remove current_is_64bit()

From: Michal Suchánek
Date: Wed Nov 27 2019 - 04:49:17 EST


On Wed, Nov 27, 2019 at 06:41:09AM +0100, Christophe Leroy wrote:
>
>
> Le 26/11/2019 à 21:13, Michal Suchanek a écrit :
> > Since commit ed1cd6deb013 ("powerpc: Activate CONFIG_THREAD_INFO_IN_TASK")
> > current_is_64bit() is quivalent to !is_32bit_task().
> > Remove the redundant function.
> >
> > Link: https://github.com/linuxppc/issues/issues/275
> > Link: https://lkml.org/lkml/2019/9/12/540
> >
> > Fixes: linuxppc#275
> > Suggested-by: Christophe Leroy <christophe.leroy@xxxxxx>
> > Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
>
> This change is already in powerpc/next, see https://github.com/linuxppc/linux/commit/42484d2c0f82b666292faf6668c77b49a3a04bc0

Right, needs rebase.

Thanks

Michal
>
> Christophe
>
> > ---
> > arch/powerpc/perf/callchain.c | 17 +----------------
> > 1 file changed, 1 insertion(+), 16 deletions(-)
> >
> > diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c
> > index c84bbd4298a0..35d542515faf 100644
> > --- a/arch/powerpc/perf/callchain.c
> > +++ b/arch/powerpc/perf/callchain.c
> > @@ -284,16 +284,6 @@ static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
> > }
> > }
> > -static inline int current_is_64bit(void)
> > -{
> > - /*
> > - * We can't use test_thread_flag() here because we may be on an
> > - * interrupt stack, and the thread flags don't get copied over
> > - * from the thread_info on the main stack to the interrupt stack.
> > - */
> > - return !test_ti_thread_flag(task_thread_info(current), TIF_32BIT);
> > -}
> > -
> > #else /* CONFIG_PPC64 */
> > /*
> > * On 32-bit we just access the address and let hash_page create a
> > @@ -321,11 +311,6 @@ static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry
> > {
> > }
> > -static inline int current_is_64bit(void)
> > -{
> > - return 0;
> > -}
> > -
> > static inline int valid_user_sp(unsigned long sp, int is_64)
> > {
> > if (!sp || (sp & 7) || sp > TASK_SIZE - 32)
> > @@ -486,7 +471,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
> > void
> > perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
> > {
> > - if (current_is_64bit())
> > + if (!is_32bit_task())
> > perf_callchain_user_64(entry, regs);
> > else
> > perf_callchain_user_32(entry, regs);
> >