linux-kernel - [PATCH] powerpc/64s: Mark 'dummy_copy

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Date:   Tue, 12 Mar 2019 21:29:21 +0100
From:   Mathieu Malaterre <malat@...ian.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Mathieu Malaterre <malat@...ian.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc/64s: Mark 'dummy_copy_buffer' as used

In commit 07d2a628bc00 ("powerpc/64s: Avoid cpabort in context switch
when possible") a buffer 'dummy_copy_buffer' was introduced. gcc does
not see this buffer being used in the inline assembly within function
'__switch_to', explicitly marked this variable as being used.

Prefer using '__aligned' to get passed line over 80 characters warning
in checkpatch.

This remove the following warning:

  arch/powerpc/kernel/process.c:1156:17: error: 'dummy_copy_buffer' defined but not used [-Werror=unused-const-variable=]

Cc: Nicholas Piggin <npiggin@...il.com>
Signed-off-by: Mathieu Malaterre <malat@...ian.org>
---
 arch/powerpc/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 77e44275d025..5acf63d45802 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1153,7 +1153,7 @@ static inline void restore_sprs(struct thread_struct *old_thread,
 
 #ifdef CONFIG_PPC_BOOK3S_64
 #define CP_SIZE 128
-static const u8 dummy_copy_buffer[CP_SIZE] __attribute__((aligned(CP_SIZE)));
+static const u8 dummy_copy_buffer[CP_SIZE] __aligned(CP_SIZE) __used;
 #endif
 
 struct task_struct *__switch_to(struct task_struct *prev,
-- 
2.20.1