linux-kernel - [PATCH] powerpc: restore current_thread

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Message-Id: <20190507225121.18676-1-ynorov@marvell.com>
Date:   Tue,  7 May 2019 15:51:21 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Breno Leitao <leitao@...ian.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Yury Norov <ynorov@...vell.com>, Yury Norov <yury.norov@...il.com>
Subject: [PATCH] powerpc: restore current_thread_info()

Commit ed1cd6deb013 ("powerpc: Activate CONFIG_THREAD_INFO_IN_TASK")
removes the function current_thread_info(). It's wrong because the
function is used in non-arch code and is part of API.

For my series of arm64/ilp32, after applying the patch
https://github.com/norov/linux/commit/b269e51eee66ffec3008a3effb12363b91754e49
it causes build break.

This patch restores current_thread_info().

Signed-off-by: Yury Norov <ynorov@...vell.com>
---
 arch/powerpc/include/asm/thread_info.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index 8e1d0195ac36..f700bc80a607 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -19,6 +19,7 @@
 
 #ifndef __ASSEMBLY__
 #include <linux/cache.h>
+#include <asm/current.h>
 #include <asm/processor.h>
 #include <asm/page.h>
 #include <asm/accounting.h>
@@ -57,6 +58,11 @@ struct thread_info {
 #define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
 
 /* how to get the thread information struct from C */
+static inline struct thread_info *current_thread_info(void)
+{
+	return (struct thread_info *)current;
+}
+
 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
 
 #ifdef CONFIG_PPC_BOOK3S_64
-- 
2.17.1