lkml.org 
[lkml]   [2019]   [May]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] powerpc/powernv: fix variable "c" set but not used
Date
The commit 58629c0dc349 ("powerpc/powernv/npu: Fault user page into the
hypervisor's pagetable") introduced a variable "c" to be used in
__get_user() and __get_user_nocheck() which need to stay as macros for
performance reasons, and "c" is not actually used in
pnv_npu2_handle_fault(),

arch/powerpc/platforms/powernv/npu-dma.c: In function 'pnv_npu2_handle_fault':
arch/powerpc/platforms/powernv/npu-dma.c:1122:7: warning: variable 'c'
set but not used [-Wunused-but-set-variable]

Fixed it by appending the __maybe_unused attribute, so compilers would
ignore it.

Signed-off-by: Qian Cai <cai@lca.pw>
---
arch/powerpc/platforms/powernv/npu-dma.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
index 495550432f3d..5bbe59573ee6 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c
@@ -1119,7 +1119,8 @@ int pnv_npu2_handle_fault(struct npu_context *context, uintptr_t *ea,
int i, is_write;
struct page *page[1];
const char __user *u;
- char c;
+ /* To silence a -Wunused-but-set-variable warning. */
+ char c __maybe_unused;

/* mmap_sem should be held so the struct_mm must be present */
struct mm_struct *mm = context->mm;
--
2.20.1 (Apple Git-117)
\
 
 \ /
  Last update: 2019-05-23 04:33    [W:0.075 / U:0.364 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site