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ARM: omap2: remove unneeded variable: "errata"

Message ID 20210624032751.24315-1-13145886936@163.com (mailing list archive)
State New, archived
Headers show
Series ARM: omap2: remove unneeded variable: "errata" | expand

Commit Message

gushengxian June 24, 2021, 3:27 a.m. UTC 
From: gushengxian <gushengxian@yulong.com>

Remove unneeded variable: "errata".

Signed-off-by: gushengxian <gushengxian@yulong.com>
---
 arch/arm/mach-omap2/dma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Comments

Russell King (Oracle) June 24, 2021, 7:28 a.m. UTC | #1 
On Wed, Jun 23, 2021 at 08:27:51PM -0700, 13145886936@163.com wrote:
> From: gushengxian <gushengxian@yulong.com>
> 
> Remove unneeded variable: "errata".
> 
> Signed-off-by: gushengxian <gushengxian@yulong.com>

NAK.

> diff --git a/arch/arm/mach-omap2/dma.c b/arch/arm/mach-omap2/dma.c
> index dfc9b21ff19b..ba4a48e3d264 100644
> --- a/arch/arm/mach-omap2/dma.c
> +++ b/arch/arm/mach-omap2/dma.c
> @@ -79,7 +79,6 @@ static const struct omap_dma_reg reg_map[] = {
>  
>  static unsigned configure_dma_errata(void)
>  {
> -	unsigned errata = 0;
>  
>  	/*
>  	 * Errata applicable for OMAP2430ES1.0 and all omap2420
> @@ -158,7 +157,7 @@ static unsigned configure_dma_errata(void)
>  	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
>  		SET_DMA_ERRATA(DMA_ROMCODE_BUG);
>  
> -	return errata;
> +	return 0;

It is _not_ "unneeded" and you clearly have not compiled the resulting
code from your patch.

#define SET_DMA_ERRATA(id)              (errata |= (id))

errata is used inside the SET_DMA_ERRATA() macro. Hence, building
mach-omap2/dma.c would have failed.
kernel test robot June 26, 2021, 12:23 a.m. UTC | #2 
Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on omap/for-next]
[also build test ERROR on v5.13-rc7 next-20210625]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/13145886936-163-com/ARM-omap2-remove-unneeded-variable-errata/20210624-112929
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap.git for-next
config: arm-randconfig-r004-20210625 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9ca0171a9ffdef5fdb1511d197a3fd72490362de)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/d29c977cd4692b7db84c7fa336de0bfe8941584e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review 13145886936-163-com/ARM-omap2-remove-unneeded-variable-errata/20210624-112929
        git checkout d29c977cd4692b7db84c7fa336de0bfe8941584e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> arch/arm/mach-omap2/dma.c:112:3: error: use of undeclared identifier 'errata'
                   SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING);
                   ^
   include/linux/omap-dma.h:105:30: note: expanded from macro 'SET_DMA_ERRATA'
   #define SET_DMA_ERRATA(id)              (errata |= (id))
                                            ^
   arch/arm/mach-omap2/dma.c:113:3: error: use of undeclared identifier 'errata'
                   SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS);
                   ^
   include/linux/omap-dma.h:105:30: note: expanded from macro 'SET_DMA_ERRATA'
   #define SET_DMA_ERRATA(id)              (errata |= (id))
                                            ^
   arch/arm/mach-omap2/dma.c:122:3: error: use of undeclared identifier 'errata'
                   SET_DMA_ERRATA(DMA_ERRATA_i378);
                   ^
   include/linux/omap-dma.h:105:30: note: expanded from macro 'SET_DMA_ERRATA'
   #define SET_DMA_ERRATA(id)              (errata |= (id))
                                            ^
   arch/arm/mach-omap2/dma.c:133:3: error: use of undeclared identifier 'errata'
                   SET_DMA_ERRATA(DMA_ERRATA_i541);
                   ^
   include/linux/omap-dma.h:105:30: note: expanded from macro 'SET_DMA_ERRATA'
   #define SET_DMA_ERRATA(id)              (errata |= (id))
                                            ^
   arch/arm/mach-omap2/dma.c:142:3: error: use of undeclared identifier 'errata'
                   SET_DMA_ERRATA(DMA_ERRATA_i88);
                   ^
   include/linux/omap-dma.h:105:30: note: expanded from macro 'SET_DMA_ERRATA'
   #define SET_DMA_ERRATA(id)              (errata |= (id))
                                            ^
   arch/arm/mach-omap2/dma.c:148:2: error: use of undeclared identifier 'errata'
           SET_DMA_ERRATA(DMA_ERRATA_3_3);
           ^
   include/linux/omap-dma.h:105:30: note: expanded from macro 'SET_DMA_ERRATA'
   #define SET_DMA_ERRATA(id)              (errata |= (id))
                                            ^
   arch/arm/mach-omap2/dma.c:158:3: error: use of undeclared identifier 'errata'
                   SET_DMA_ERRATA(DMA_ROMCODE_BUG);
                   ^
   include/linux/omap-dma.h:105:30: note: expanded from macro 'SET_DMA_ERRATA'
   #define SET_DMA_ERRATA(id)              (errata |= (id))
                                            ^
   7 errors generated.


vim +/errata +112 arch/arm/mach-omap2/dma.c

f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   82  
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   83  	/*
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   84  	 * Errata applicable for OMAP2430ES1.0 and all omap2420
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   85  	 *
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   86  	 * I.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   87  	 * Erratum ID: Not Available
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   88  	 * Inter Frame DMA buffering issue DMA will wrongly
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   89  	 * buffer elements if packing and bursting is enabled. This might
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   90  	 * result in data gets stalled in FIFO at the end of the block.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   91  	 * Workaround: DMA channels must have BUFFERING_DISABLED bit set to
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   92  	 * guarantee no data will stay in the DMA FIFO in case inter frame
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   93  	 * buffering occurs
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   94  	 *
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   95  	 * II.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   96  	 * Erratum ID: Not Available
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   97  	 * DMA may hang when several channels are used in parallel
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   98  	 * In the following configuration, DMA channel hanging can occur:
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20   99  	 * a. Channel i, hardware synchronized, is enabled
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  100  	 * b. Another channel (Channel x), software synchronized, is enabled.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  101  	 * c. Channel i is disabled before end of transfer
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  102  	 * d. Channel i is reenabled.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  103  	 * e. Steps 1 to 4 are repeated a certain number of times.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  104  	 * f. A third channel (Channel y), software synchronized, is enabled.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  105  	 * Channel x and Channel y may hang immediately after step 'f'.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  106  	 * Workaround:
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  107  	 * For any channel used - make sure NextLCH_ID is set to the value j.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  108  	 */
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  109  	if (cpu_is_omap2420() || (cpu_is_omap2430() &&
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  110  				(omap_type() == OMAP2430_REV_ES1_0))) {
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  111  
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20 @112  		SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING);
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  113  		SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS);
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  114  	}
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  115  
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  116  	/*
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  117  	 * Erratum ID: i378: OMAP2+: sDMA Channel is not disabled
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  118  	 * after a transaction error.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  119  	 * Workaround: SW should explicitely disable the channel.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  120  	 */
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  121  	if (cpu_class_is_omap2())
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  122  		SET_DMA_ERRATA(DMA_ERRATA_i378);
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  123  
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  124  	/*
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  125  	 * Erratum ID: i541: sDMA FIFO draining does not finish
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  126  	 * If sDMA channel is disabled on the fly, sDMA enters standby even
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  127  	 * through FIFO Drain is still in progress
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  128  	 * Workaround: Put sDMA in NoStandby more before a logical channel is
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  129  	 * disabled, then put it back to SmartStandby right after the channel
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  130  	 * finishes FIFO draining.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  131  	 */
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  132  	if (cpu_is_omap34xx())
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  133  		SET_DMA_ERRATA(DMA_ERRATA_i541);
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  134  
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  135  	/*
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  136  	 * Erratum ID: i88 : Special programming model needed to disable DMA
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  137  	 * before end of block.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  138  	 * Workaround: software must ensure that the DMA is configured in No
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  139  	 * Standby mode(DMAx_OCP_SYSCONFIG.MIDLEMODE = "01")
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  140  	 */
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  141  	if (omap_type() == OMAP3430_REV_ES1_0)
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  142  		SET_DMA_ERRATA(DMA_ERRATA_i88);
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  143  
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  144  	/*
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  145  	 * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  146  	 * read before the DMA controller finished disabling the channel.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  147  	 */
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  148  	SET_DMA_ERRATA(DMA_ERRATA_3_3);
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  149  
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  150  	/*
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  151  	 * Erratum ID: Not Available
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  152  	 * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  153  	 * after secure sram context save and restore.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  154  	 * Work around: Hence we need to manually clear those IRQs to avoid
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  155  	 * spurious interrupts. This affects only secure devices.
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  156  	 */
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  157  	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  158  		SET_DMA_ERRATA(DMA_ROMCODE_BUG);
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  159  
d29c977cd4692b gushengxian           2021-06-23  160  	return 0;
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  161  }
f31cc9622d75c1 G, Manjunath Kondaiah 2010-12-20  162  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/arch/arm/mach-omap2/dma.c b/arch/arm/mach-omap2/dma.c
index dfc9b21ff19b..ba4a48e3d264 100644
--- a/arch/arm/mach-omap2/dma.c
+++ b/arch/arm/mach-omap2/dma.c
@@ -79,7 +79,6 @@  static const struct omap_dma_reg reg_map[] = {
 
 static unsigned configure_dma_errata(void)
 {
-	unsigned errata = 0;
 
 	/*
 	 * Errata applicable for OMAP2430ES1.0 and all omap2420
@@ -158,7 +157,7 @@  static unsigned configure_dma_errata(void)
 	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
 		SET_DMA_ERRATA(DMA_ROMCODE_BUG);
 
-	return errata;
+	return 0;
 }
 
 static const struct dma_slave_map omap24xx_sdma_dt_map[] = {