From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Michal Suchanek <msuchanek@suse.de>, linuxppc-dev@lists.ozlabs.org
Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
David Hildenbrand <david@redhat.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Paul Mackerras <paulus@samba.org>,
Breno Leitao <leitao@debian.org>,
Michael Neuling <mikey@neuling.org>,
Diana Craciun <diana.craciun@nxp.com>,
Firoz Khan <firoz.khan@linaro.org>,
Hari Bathini <hbathini@linux.ibm.com>,
Joel Stanley <joel@jms.id.au>, Arnd Bergmann <arnd@arndb.de>,
Nicholas Piggin <npiggin@gmail.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Allison Randal <allison@lohutok.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
"Eric W. Biederman" <ebiederm@xmission.com>,
Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
linux-fsdevel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v8 5/7] powerpc/64: make buildable without CONFIG_COMPAT
Date: Thu, 12 Sep 2019 20:02:16 +0200 [thread overview]
Message-ID: <9973bf6b-f1b9-c778-bd88-ed41e45ca126@c-s.fr> (raw)
In-Reply-To: <039ed7ac686927fe169241ac72225a258d95ccfc.1568306311.git.msuchanek@suse.de>
Le 12/09/2019 à 19:26, Michal Suchanek a écrit :
> There are numerous references to 32bit functions in generic and 64bit
> code so ifdef them out.
>
> Signed-off-by: Michal Suchanek <msuchanek@suse.de>
> ---
> v2:
> - fix 32bit ifdef condition in signal.c
> - simplify the compat ifdef condition in vdso.c - 64bit is redundant
> - simplify the compat ifdef condition in callchain.c - 64bit is redundant
> v3:
> - use IS_ENABLED and maybe_unused where possible
> - do not ifdef declarations
> - clean up Makefile
> v4:
> - further makefile cleanup
> - simplify is_32bit_task conditions
> - avoid ifdef in condition by using return
> v5:
> - avoid unreachable code on 32bit
> - make is_current_64bit constant on !COMPAT
> - add stub perf_callchain_user_32 to avoid some ifdefs
> v6:
> - consolidate current_is_64bit
> v7:
> - remove leftover perf_callchain_user_32 stub from previous series version
> v8:
> - fix build again - too trigger-happy with stub removal
> - remove a vdso.c hunk that causes warning according to kbuild test robot
> ---
> arch/powerpc/include/asm/thread_info.h | 4 +--
> arch/powerpc/kernel/Makefile | 7 ++---
> arch/powerpc/kernel/entry_64.S | 2 ++
> arch/powerpc/kernel/signal.c | 3 +-
> arch/powerpc/kernel/syscall_64.c | 6 ++--
> arch/powerpc/kernel/vdso.c | 3 +-
> arch/powerpc/perf/callchain.c | 39 ++++++++++++++------------
> 7 files changed, 33 insertions(+), 31 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
> index 8e1d0195ac36..c128d8a48ea3 100644
> --- a/arch/powerpc/include/asm/thread_info.h
> +++ b/arch/powerpc/include/asm/thread_info.h
> @@ -144,10 +144,10 @@ static inline bool test_thread_local_flags(unsigned int flags)
> return (ti->local_flags & flags) != 0;
> }
>
> -#ifdef CONFIG_PPC64
> +#ifdef CONFIG_COMPAT
> #define is_32bit_task() (test_thread_flag(TIF_32BIT))
> #else
> -#define is_32bit_task() (1)
> +#define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
> #endif
>
> #if defined(CONFIG_PPC64)
[...]
> +static inline int current_is_64bit(void)
> +{
> + if (!IS_ENABLED(CONFIG_COMPAT))
> + return IS_ENABLED(CONFIG_PPC64);
> + /*
> + * 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);
> +}
Since at least commit ed1cd6deb013 ("powerpc: Activate
CONFIG_THREAD_INFO_IN_TASK")
[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ed1cd6d]
the above comment is wrong and current_is_64bit() is equivalent to
!is_32bit_task()
See https://github.com/linuxppc/issues/issues/275
Christophe
next prev parent reply other threads:[~2019-09-12 18:04 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-12 17:26 [PATCH v8 0/7] Disable compat cruft on ppc64le v8 Michal Suchanek
2019-09-12 17:26 ` [PATCH v8 1/7] powerpc: Add back __ARCH_WANT_SYS_LLSEEK macro Michal Suchanek
2019-09-12 17:26 ` [PATCH v8 2/7] powerpc: move common register copy functions from signal_32.c to signal.c Michal Suchanek
2019-09-12 17:26 ` [PATCH v8 3/7] powerpc/perf: consolidate read_user_stack_32 Michal Suchanek
2019-09-12 17:26 ` [PATCH v8 4/7] powerpc/perf: consolidate valid_user_sp Michal Suchanek
2019-09-12 17:26 ` [PATCH v8 5/7] powerpc/64: make buildable without CONFIG_COMPAT Michal Suchanek
2019-09-12 18:02 ` Christophe Leroy [this message]
2019-09-12 18:26 ` Michal Suchánek
2019-09-12 19:36 ` Christophe Leroy
2019-09-12 20:19 ` Michal Suchánek
2019-09-12 19:46 ` [PATCH] powerpc/perf: remove current_is_64bit() Michal Suchanek
2019-11-14 9:07 ` Michael Ellerman
2019-09-12 17:26 ` [PATCH v8 6/7] powerpc/64: Make COMPAT user-selectable disabled on littleendian by default Michal Suchanek
2019-09-12 17:26 ` [PATCH v8 7/7] powerpc/perf: split callchain.c by bitness Michal Suchanek
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