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From: Michal Suchanek <msuchanek@suse.de>
To: linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v9 5/8] powerpc/perf: remove current_is_64bit()
Date: Fri, 13 Sep 2019 14:57:59 +0200
Message-Id: <61343717e7960595c3258cea6a9493d67adb56d8.1568319275.git.msuchanek@suse.de>
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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>, Michal Suchanek <msuchanek@suse.de>,
 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>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

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@c-s.fr>
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
 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 7863ee0a0e69..fbf76cb01026 100644
--- a/arch/powerpc/perf/callchain.c
+++ b/arch/powerpc/perf/callchain.c
@@ -275,16 +275,6 @@ 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)
 {
@@ -296,11 +286,6 @@ static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry
 {
 }
 
-static inline int current_is_64bit(void)
-{
-	return 0;
-}
-
 #define __SIGNAL_FRAMESIZE32	__SIGNAL_FRAMESIZE
 #define sigcontext32		sigcontext
 #define mcontext32		mcontext
@@ -477,7 +462,7 @@ 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);
-- 
2.23.0