From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Michal Suchanek <msuchanek@suse.de>, linuxppc-dev@lists.ozlabs.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Hari Bathini <hbathini@linux.ibm.com>,
Joel Stanley <joel@jms.id.au>,
Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
Firoz Khan <firoz.khan@linaro.org>,
Breno Leitao <leitao@debian.org>,
Russell Currey <ruscur@russell.cc>,
Nicolai Stange <nstange@suse.de>,
Michael Neuling <mikey@neuling.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Thomas Gleixner <tglx@linutronix.de>,
Arnd Bergmann <arnd@arndb.de>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Christian Brauner <christian@brauner.io>,
David Howells <dhowells@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Allison Randal <allison@lohutok.net>,
David Hildenbrand <david@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 4/6] powerpc/64: make buildable without CONFIG_COMPAT
Date: Fri, 30 Aug 2019 22:21:09 +0200 [thread overview]
Message-ID: <a04b5750-a160-01a1-c208-7950f4c495bd@c-s.fr> (raw)
In-Reply-To: <6192bddc4631d2691b98316908432ffabc5d4b40.1567188299.git.msuchanek@suse.de>
Le 30/08/2019 à 20:57, 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
> ---
> 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 | 5 ++--
> arch/powerpc/perf/callchain.c | 37 +++++++++++++++-----------
> 7 files changed, 33 insertions(+), 31 deletions(-)
>
[...]
> diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c
> index b7cdcce20280..788ad2c63f18 100644
> --- a/arch/powerpc/perf/callchain.c
> +++ b/arch/powerpc/perf/callchain.c
> @@ -15,7 +15,7 @@
> #include <asm/sigcontext.h>
> #include <asm/ucontext.h>
> #include <asm/vdso.h>
> -#ifdef CONFIG_PPC64
> +#ifdef CONFIG_COMPAT
> #include "../kernel/ppc32.h"
> #endif
> #include <asm/pte-walk.h>
> @@ -268,16 +268,6 @@ 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 */
> static int read_user_stack_slow(void __user *ptr, void *buf, int nb)
> {
> @@ -314,11 +304,6 @@ 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)
> @@ -334,6 +319,7 @@ static inline int valid_user_sp(unsigned long sp, int is_64)
>
> #endif /* CONFIG_PPC64 */
>
> +#if defined(CONFIG_PPC32) || defined(CONFIG_COMPAT)
> /*
> * Layout for non-RT signal frames
> */
> @@ -475,6 +461,25 @@ static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
> sp = next_sp;
> }
> }
> +#else /* 32bit */
> +static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
> + struct pt_regs *regs)
> +{
> + (void)&read_user_stack_32; /* unused if !COMPAT */
You don't need that anymore do you ?
Christophe
> +}
> +#endif /* 32bit */
> +
> +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);
> +}
>
> void
> perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
>
next prev parent reply other threads:[~2019-08-30 20:21 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-30 18:57 [PATCH v6 0/6] Disable compat cruft on ppc64le v6 Michal Suchanek
2019-08-30 18:57 ` [PATCH v6 1/6] powerpc: make llseek 32bit-only Michal Suchanek
2019-08-30 19:46 ` [PATCH] Revert "asm-generic: Remove unneeded __ARCH_WANT_SYS_LLSEEK macro" Michal Suchanek
2019-08-30 18:57 ` [PATCH v6 2/6] powerpc: move common register copy functions from signal_32.c to signal.c Michal Suchanek
2019-08-30 20:22 ` Christophe Leroy
2019-08-30 18:57 ` [PATCH v6 3/6] powerpc/perf: consolidate read_user_stack_32 Michal Suchanek
2019-08-30 20:21 ` Christophe Leroy
2019-08-30 18:57 ` [PATCH v6 4/6] powerpc/64: make buildable without CONFIG_COMPAT Michal Suchanek
2019-08-30 20:21 ` Christophe Leroy [this message]
2019-08-30 20:35 ` Michal Suchánek
2019-08-30 18:57 ` [PATCH v6 5/6] powerpc/64: Make COMPAT user-selectable disabled on littleendian by default Michal Suchanek
2019-08-30 20:23 ` Christophe Leroy
2019-08-30 18:57 ` [PATCH v6 6/6] powerpc/perf: split callchain.c by bitness Michal Suchanek
2019-08-30 19:06 ` Michal Suchánek
2019-09-02 2:51 ` Michael Ellerman
2019-08-30 20:28 ` Christophe Leroy
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