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intel_th: msu: Fix unused variable warning on arm64 platform 

Commit ba39bd8306 ("intel_th: msu: Switch over to scatterlist")
introduced the following warnings on non-x86 architectures, as a result
of reordering the multi mode buffer allocation sequence:

> drivers/hwtracing/intel_th/msu.c: In function ‘msc_buffer_win_alloc’:
> drivers/hwtracing/intel_th/msu.c:783:21: warning: unused variable ‘i’
> [-Wunused-variable]
> int ret = -ENOMEM, i;
>                    ^
> drivers/hwtracing/intel_th/msu.c: In function ‘msc_buffer_win_free’:
> drivers/hwtracing/intel_th/msu.c:863:6: warning: unused variable ‘i’
> [-Wunused-variable]
> int i;
>     ^

Fix this compiler warning by factoring out set_memory sequences and making
them x86-only.

Suggested-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Fixes: ba39bd8306 ("intel_th: msu: Switch over to scatterlist")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20190621161930.60785-2-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shaokun Zhang 2019-06-21 19:19:27 +03:00 committed by Greg Kroah-Hartman
parent f50dfaf772
commit b96fb368b0
1 changed files with 27 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/hwtracing/intel_th/msu.c
View File

@ -767,6 +767,30 @@ err_nomem:
return -ENOMEM;
}
#ifdef CONFIG_X86
static void msc_buffer_set_uc(struct msc_window *win, unsigned int nr_blocks)
{
int i;
for (i = 0; i < nr_blocks; i++)
/* Set the page as uncached */
set_memory_uc((unsigned long)msc_win_block(win, i), 1);
}
static void msc_buffer_set_wb(struct msc_window *win)
{
int i;
for (i = 0; i < win->nr_blocks; i++)
/* Reset the page to write-back */
set_memory_wb((unsigned long)msc_win_block(win, i), 1);
}
#else /* !X86 */
static inline void
msc_buffer_set_uc(struct msc_window *win, unsigned int nr_blocks) {}
static inline void msc_buffer_set_wb(struct msc_window *win) {}
#endif /* CONFIG_X86 */
/**
* msc_buffer_win_alloc() - alloc a window for a multiblock mode
* @msc: MSC device
@ -780,7 +804,7 @@ err_nomem:
static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks)
{
struct msc_window *win;
int ret = -ENOMEM, i;
int ret = -ENOMEM;
if (!nr_blocks)
return 0;
@ -811,11 +835,7 @@ static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks)
if (ret < 0)
goto err_nomem;
#ifdef CONFIG_X86
for (i = 0; i < ret; i++)
/* Set the page as uncached */
set_memory_uc((unsigned long)msc_win_block(win, i), 1);
#endif
msc_buffer_set_uc(win, ret);
win->nr_blocks = ret;
@ -860,8 +880,6 @@ static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win)
*/
static void msc_buffer_win_free(struct msc *msc, struct msc_window *win)
{
int i;
msc->nr_pages -= win->nr_blocks;
list_del(&win->entry);
@ -870,11 +888,7 @@ static void msc_buffer_win_free(struct msc *msc, struct msc_window *win)
msc->base_addr = 0;
}
#ifdef CONFIG_X86
for (i = 0; i < win->nr_blocks; i++)
/* Reset the page to write-back */
set_memory_wb((unsigned long)msc_win_block(win, i), 1);
#endif
msc_buffer_set_wb(win);
__msc_buffer_win_free(msc, win);