* [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable 31 times @ 2018-10-28 3:51 Ferruh Yigit 2018-10-31 3:34 ` Zhao1, Wei 0 siblings, 1 reply; 5+ messages in thread From: Ferruh Yigit @ 2018-10-28 3:51 UTC (permalink / raw) To: Jingjing Wu, Wenzhuo Lu; +Cc: dev, Ferruh Yigit, stable Fixes: e5b2a9e957e7 ("net/avf/base: add base code for avf PMD") Cc: stable@dpdk.org Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com> --- drivers/net/avf/base/avf_register.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/avf/base/avf_register.h b/drivers/net/avf/base/avf_register.h index ba5a9f3fa..adb989583 100644 --- a/drivers/net/avf/base/avf_register.h +++ b/drivers/net/avf/base/avf_register.h @@ -76,7 +76,7 @@ POSSIBILITY OF SUCH DAMAGE. #define AVF_ARQLEN1_ARQCRIT_SHIFT 30 #define AVF_ARQLEN1_ARQCRIT_MASK AVF_MASK(0x1, AVF_ARQLEN1_ARQCRIT_SHIFT) #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 -#define AVF_ARQLEN1_ARQENABLE_MASK AVF_MASK(0x1, AVF_ARQLEN1_ARQENABLE_SHIFT) +#define AVF_ARQLEN1_ARQENABLE_MASK AVF_MASK(0x1U, AVF_ARQLEN1_ARQENABLE_SHIFT) #define AVF_ARQT1 0x00007000 /* Reset: EMPR */ #define AVF_ARQT1_ARQT_SHIFT 0 #define AVF_ARQT1_ARQT_MASK AVF_MASK(0x3FF, AVF_ARQT1_ARQT_SHIFT) @@ -99,7 +99,7 @@ POSSIBILITY OF SUCH DAMAGE. #define AVF_ATQLEN1_ATQCRIT_SHIFT 30 #define AVF_ATQLEN1_ATQCRIT_MASK AVF_MASK(0x1, AVF_ATQLEN1_ATQCRIT_SHIFT) #define AVF_ATQLEN1_ATQENABLE_SHIFT 31 -#define AVF_ATQLEN1_ATQENABLE_MASK AVF_MASK(0x1, AVF_ATQLEN1_ATQENABLE_SHIFT) +#define AVF_ATQLEN1_ATQENABLE_MASK AVF_MASK(0x1U, AVF_ATQLEN1_ATQENABLE_SHIFT) #define AVF_ATQT1 0x00008400 /* Reset: EMPR */ #define AVF_ATQT1_ATQT_SHIFT 0 #define AVF_ATQT1_ATQT_MASK AVF_MASK(0x3FF, AVF_ATQT1_ATQT_SHIFT) -- 2.17.2 ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable 31 times 2018-10-28 3:51 [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable 31 times Ferruh Yigit @ 2018-10-31 3:34 ` Zhao1, Wei 2018-11-05 14:30 ` Ferruh Yigit 2018-11-05 15:03 ` Ferruh Yigit 0 siblings, 2 replies; 5+ messages in thread From: Zhao1, Wei @ 2018-10-31 3:34 UTC (permalink / raw) To: Yigit, Ferruh, Wu, Jingjing, Lu, Wenzhuo; +Cc: dev, Yigit, Ferruh, stable > -----Original Message----- > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Ferruh Yigit > Sent: Sunday, October 28, 2018 11:52 AM > To: Wu, Jingjing <jingjing.wu@intel.com>; Lu, Wenzhuo > <wenzhuo.lu@intel.com> > Cc: dev@dpdk.org; Yigit, Ferruh <ferruh.yigit@intel.com>; stable@dpdk.org > Subject: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable > 31 times > > Fixes: e5b2a9e957e7 ("net/avf/base: add base code for avf PMD") > Cc: stable@dpdk.org > > Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com> > --- > drivers/net/avf/base/avf_register.h | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/avf/base/avf_register.h > b/drivers/net/avf/base/avf_register.h > index ba5a9f3fa..adb989583 100644 > --- a/drivers/net/avf/base/avf_register.h > +++ b/drivers/net/avf/base/avf_register.h > @@ -76,7 +76,7 @@ POSSIBILITY OF SUCH DAMAGE. > #define AVF_ARQLEN1_ARQCRIT_SHIFT 30 > #define AVF_ARQLEN1_ARQCRIT_MASK AVF_MASK(0x1, > AVF_ARQLEN1_ARQCRIT_SHIFT) > #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 > -#define AVF_ARQLEN1_ARQENABLE_MASK AVF_MASK(0x1, > AVF_ARQLEN1_ARQENABLE_SHIFT) > +#define AVF_ARQLEN1_ARQENABLE_MASK AVF_MASK(0x1U, > +AVF_ARQLEN1_ARQENABLE_SHIFT) > #define AVF_ARQT1 0x00007000 /* Reset: EMPR */ > #define AVF_ARQT1_ARQT_SHIFT 0 > #define AVF_ARQT1_ARQT_MASK AVF_MASK(0x3FF, > AVF_ARQT1_ARQT_SHIFT) @@ -99,7 +99,7 @@ POSSIBILITY OF SUCH > DAMAGE. > #define AVF_ATQLEN1_ATQCRIT_SHIFT 30 > #define AVF_ATQLEN1_ATQCRIT_MASK AVF_MASK(0x1, > AVF_ATQLEN1_ATQCRIT_SHIFT) > #define AVF_ATQLEN1_ATQENABLE_SHIFT 31 > -#define AVF_ATQLEN1_ATQENABLE_MASK AVF_MASK(0x1, > AVF_ATQLEN1_ATQENABLE_SHIFT) > +#define AVF_ATQLEN1_ATQENABLE_MASK AVF_MASK(0x1U, > +AVF_ATQLEN1_ATQENABLE_SHIFT) > #define AVF_ATQT1 0x00008400 /* Reset: EMPR */ > #define AVF_ATQT1_ATQT_SHIFT 0 > #define AVF_ATQT1_ATQT_MASK AVF_MASK(0x3FF, > AVF_ATQT1_ATQT_SHIFT) > -- > 2.17.2 I have test this code change with a small function to observe the difference. Reviewed-by: Wei Zhao <wei.zhao1@intel.com> #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 #define AVF_MASK(mask, shift) (mask << shift) #define AVF_ARQLEN1_ARQENABLE_MASK1 AVF_MASK(0x1, AVF_ARQLEN1_ARQENABLE_SHIFT) #define AVF_ARQLEN1_ARQENABLE_MASK2 AVF_MASK(0x1U, AVF_ARQLEN1_ARQENABLE_SHIFT) void main(int argc,char **argv) { signed int a=1; printf("Hello Linux\n"); printf("%x,=%x\n",AVF_ARQLEN1_ARQENABLE_MASK1,AVF_ARQLEN1_ARQENABLE_MASK2); printf("a=%x\n",a<<31); } ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable 31 times 2018-10-31 3:34 ` Zhao1, Wei @ 2018-11-05 14:30 ` Ferruh Yigit 2018-11-07 2:42 ` Zhao1, Wei 2018-11-05 15:03 ` Ferruh Yigit 1 sibling, 1 reply; 5+ messages in thread From: Ferruh Yigit @ 2018-11-05 14:30 UTC (permalink / raw) To: Zhao1, Wei, Wu, Jingjing, Lu, Wenzhuo; +Cc: dev, stable On 10/31/2018 3:34 AM, Zhao1, Wei wrote: > > >> -----Original Message----- >> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Ferruh Yigit >> Sent: Sunday, October 28, 2018 11:52 AM >> To: Wu, Jingjing <jingjing.wu@intel.com>; Lu, Wenzhuo >> <wenzhuo.lu@intel.com> >> Cc: dev@dpdk.org; Yigit, Ferruh <ferruh.yigit@intel.com>; stable@dpdk.org >> Subject: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable >> 31 times >> >> Fixes: e5b2a9e957e7 ("net/avf/base: add base code for avf PMD") >> Cc: stable@dpdk.org >> >> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com> >> --- >> drivers/net/avf/base/avf_register.h | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/net/avf/base/avf_register.h >> b/drivers/net/avf/base/avf_register.h >> index ba5a9f3fa..adb989583 100644 >> --- a/drivers/net/avf/base/avf_register.h >> +++ b/drivers/net/avf/base/avf_register.h >> @@ -76,7 +76,7 @@ POSSIBILITY OF SUCH DAMAGE. >> #define AVF_ARQLEN1_ARQCRIT_SHIFT 30 >> #define AVF_ARQLEN1_ARQCRIT_MASK AVF_MASK(0x1, >> AVF_ARQLEN1_ARQCRIT_SHIFT) >> #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 >> -#define AVF_ARQLEN1_ARQENABLE_MASK AVF_MASK(0x1, >> AVF_ARQLEN1_ARQENABLE_SHIFT) >> +#define AVF_ARQLEN1_ARQENABLE_MASK AVF_MASK(0x1U, >> +AVF_ARQLEN1_ARQENABLE_SHIFT) >> #define AVF_ARQT1 0x00007000 /* Reset: EMPR */ >> #define AVF_ARQT1_ARQT_SHIFT 0 >> #define AVF_ARQT1_ARQT_MASK AVF_MASK(0x3FF, >> AVF_ARQT1_ARQT_SHIFT) @@ -99,7 +99,7 @@ POSSIBILITY OF SUCH >> DAMAGE. >> #define AVF_ATQLEN1_ATQCRIT_SHIFT 30 >> #define AVF_ATQLEN1_ATQCRIT_MASK AVF_MASK(0x1, >> AVF_ATQLEN1_ATQCRIT_SHIFT) >> #define AVF_ATQLEN1_ATQENABLE_SHIFT 31 >> -#define AVF_ATQLEN1_ATQENABLE_MASK AVF_MASK(0x1, >> AVF_ATQLEN1_ATQENABLE_SHIFT) >> +#define AVF_ATQLEN1_ATQENABLE_MASK AVF_MASK(0x1U, >> +AVF_ATQLEN1_ATQENABLE_SHIFT) >> #define AVF_ATQT1 0x00008400 /* Reset: EMPR */ >> #define AVF_ATQT1_ATQT_SHIFT 0 >> #define AVF_ATQT1_ATQT_MASK AVF_MASK(0x3FF, >> AVF_ATQT1_ATQT_SHIFT) >> -- >> 2.17.2 > > I have test this code change with a small function to observe the difference. > Reviewed-by: Wei Zhao <wei.zhao1@intel.com> > > #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 > #define AVF_MASK(mask, shift) (mask << shift) > #define AVF_ARQLEN1_ARQENABLE_MASK1 AVF_MASK(0x1, AVF_ARQLEN1_ARQENABLE_SHIFT) > #define AVF_ARQLEN1_ARQENABLE_MASK2 AVF_MASK(0x1U, AVF_ARQLEN1_ARQENABLE_SHIFT) > > void main(int argc,char **argv) > { > signed int a=1; > > printf("Hello Linux\n"); > printf("%x,=%x\n",AVF_ARQLEN1_ARQENABLE_MASK1,AVF_ARQLEN1_ARQENABLE_MASK2); > printf("a=%x\n",a<<31); > > } I guess you are tying to say there is no difference, output of your code is: Hello Linux 80000000,=80000000 a=80000000 Let's have a little addition to your program, #include <stdio.h> #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 #define AVF_MASK(mask, shift) (mask << shift) #define AVF_ARQLEN1_ARQENABLE_MASK1 AVF_MASK(0x1, AVF_ARQLEN1_ARQENABLE_SHIFT) #define AVF_ARQLEN1_ARQENABLE_MASK2 AVF_MASK(0x1U, AVF_ARQLEN1_ARQENABLE_SHIFT) #define AVF_MASK2(mask, shift) (mask >> shift) #define AVF_ARQLEN1_ARQENABLE_MASK11 AVF_MASK2(AVF_ARQLEN1_ARQENABLE_MASK1, 30) #define AVF_ARQLEN1_ARQENABLE_MASK22 AVF_MASK2(AVF_ARQLEN1_ARQENABLE_MASK2, 30) void main(int argc,char **argv) { signed int a=1; printf("Hello Linux\n"); printf("%x,=%x\n", AVF_ARQLEN1_ARQENABLE_MASK1, AVF_ARQLEN1_ARQENABLE_MASK2); printf("%x,=%x\n", AVF_ARQLEN1_ARQENABLE_MASK11, AVF_ARQLEN1_ARQENABLE_MASK22); printf("a=%x\n", a<<31); } Will results same for second line? Both does ((1 << 31) >> 30). '1' is promoted to signed int by default and cppcheck complains that shifting signed variable 31 times is undefined behaviour, and here intention is not really have the 1 as signed integer, so better to fix it. Thanks, ferruh ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable 31 times 2018-11-05 14:30 ` Ferruh Yigit @ 2018-11-07 2:42 ` Zhao1, Wei 0 siblings, 0 replies; 5+ messages in thread From: Zhao1, Wei @ 2018-11-07 2:42 UTC (permalink / raw) To: Yigit, Ferruh, Wu, Jingjing, Lu, Wenzhuo; +Cc: dev, stable > -----Original Message----- > From: Yigit, Ferruh > Sent: Monday, November 5, 2018 10:31 PM > To: Zhao1, Wei <wei.zhao1@intel.com>; Wu, Jingjing > <jingjing.wu@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com> > Cc: dev@dpdk.org; stable@dpdk.org > Subject: Re: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed > variable 31 times > > On 10/31/2018 3:34 AM, Zhao1, Wei wrote: > > > > > >> -----Original Message----- > >> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Ferruh Yigit > >> Sent: Sunday, October 28, 2018 11:52 AM > >> To: Wu, Jingjing <jingjing.wu@intel.com>; Lu, Wenzhuo > >> <wenzhuo.lu@intel.com> > >> Cc: dev@dpdk.org; Yigit, Ferruh <ferruh.yigit@intel.com>; > >> stable@dpdk.org > >> Subject: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed > >> variable > >> 31 times > >> > >> Fixes: e5b2a9e957e7 ("net/avf/base: add base code for avf PMD") > >> Cc: stable@dpdk.org > >> > >> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com> > >> --- > >> drivers/net/avf/base/avf_register.h | 4 ++-- > >> 1 file changed, 2 insertions(+), 2 deletions(-) > >> > >> diff --git a/drivers/net/avf/base/avf_register.h > >> b/drivers/net/avf/base/avf_register.h > >> index ba5a9f3fa..adb989583 100644 > >> --- a/drivers/net/avf/base/avf_register.h > >> +++ b/drivers/net/avf/base/avf_register.h > >> @@ -76,7 +76,7 @@ POSSIBILITY OF SUCH DAMAGE. > >> #define AVF_ARQLEN1_ARQCRIT_SHIFT 30 > >> #define AVF_ARQLEN1_ARQCRIT_MASK AVF_MASK(0x1, > >> AVF_ARQLEN1_ARQCRIT_SHIFT) > >> #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 -#define > >> AVF_ARQLEN1_ARQENABLE_MASK AVF_MASK(0x1, > >> AVF_ARQLEN1_ARQENABLE_SHIFT) > >> +#define AVF_ARQLEN1_ARQENABLE_MASK AVF_MASK(0x1U, > >> +AVF_ARQLEN1_ARQENABLE_SHIFT) > >> #define AVF_ARQT1 0x00007000 /* Reset: EMPR */ > >> #define AVF_ARQT1_ARQT_SHIFT 0 > >> #define AVF_ARQT1_ARQT_MASK AVF_MASK(0x3FF, > >> AVF_ARQT1_ARQT_SHIFT) @@ -99,7 +99,7 @@ POSSIBILITY OF SUCH > DAMAGE. > >> #define AVF_ATQLEN1_ATQCRIT_SHIFT 30 > >> #define AVF_ATQLEN1_ATQCRIT_MASK AVF_MASK(0x1, > >> AVF_ATQLEN1_ATQCRIT_SHIFT) > >> #define AVF_ATQLEN1_ATQENABLE_SHIFT 31 -#define > >> AVF_ATQLEN1_ATQENABLE_MASK AVF_MASK(0x1, > >> AVF_ATQLEN1_ATQENABLE_SHIFT) > >> +#define AVF_ATQLEN1_ATQENABLE_MASK AVF_MASK(0x1U, > >> +AVF_ATQLEN1_ATQENABLE_SHIFT) > >> #define AVF_ATQT1 0x00008400 /* Reset: EMPR */ > >> #define AVF_ATQT1_ATQT_SHIFT 0 > >> #define AVF_ATQT1_ATQT_MASK AVF_MASK(0x3FF, > >> AVF_ATQT1_ATQT_SHIFT) > >> -- > >> 2.17.2 > > > > I have test this code change with a small function to observe the difference. > > Reviewed-by: Wei Zhao <wei.zhao1@intel.com> > > > > #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 #define AVF_MASK(mask, > shift) > > (mask << shift) #define AVF_ARQLEN1_ARQENABLE_MASK1 > AVF_MASK(0x1, > > AVF_ARQLEN1_ARQENABLE_SHIFT) #define > AVF_ARQLEN1_ARQENABLE_MASK2 > > AVF_MASK(0x1U, AVF_ARQLEN1_ARQENABLE_SHIFT) > > > > void main(int argc,char **argv) > > { > > signed int a=1; > > > > printf("Hello Linux\n"); > > > printf("%x,=%x\n",AVF_ARQLEN1_ARQENABLE_MASK1,AVF_ARQLEN1_ARQ > ENABLE_MASK2); > > printf("a=%x\n",a<<31); > > > > } > > I guess you are tying to say there is no difference, output of your code is: > Hello Linux > 80000000,=80000000 > a=80000000 > > > Let's have a little addition to your program, #include <stdio.h> > > #define AVF_ARQLEN1_ARQENABLE_SHIFT 31 > #define AVF_MASK(mask, shift) (mask << shift) #define > AVF_ARQLEN1_ARQENABLE_MASK1 AVF_MASK(0x1, > AVF_ARQLEN1_ARQENABLE_SHIFT) #define > AVF_ARQLEN1_ARQENABLE_MASK2 AVF_MASK(0x1U, > AVF_ARQLEN1_ARQENABLE_SHIFT) #define AVF_MASK2(mask, shift) > (mask >> shift) #define AVF_ARQLEN1_ARQENABLE_MASK11 > AVF_MASK2(AVF_ARQLEN1_ARQENABLE_MASK1, 30) #define > AVF_ARQLEN1_ARQENABLE_MASK22 > AVF_MASK2(AVF_ARQLEN1_ARQENABLE_MASK2, 30) > > void main(int argc,char **argv) > { > signed int a=1; > > printf("Hello Linux\n"); > printf("%x,=%x\n", AVF_ARQLEN1_ARQENABLE_MASK1, > AVF_ARQLEN1_ARQENABLE_MASK2); > printf("%x,=%x\n", AVF_ARQLEN1_ARQENABLE_MASK11, > AVF_ARQLEN1_ARQENABLE_MASK22); > printf("a=%x\n", a<<31); > > } > > > Will results same for second line? Both does ((1 << 31) >> 30). > > > '1' is promoted to signed int by default and cppcheck complains that shifting > signed variable 31 times is undefined behaviour, and here intention is not > really have the 1 as signed integer, so better to fix it. > Acked-by: Wei Zhao <wei.zhao1@intel.com> > Thanks, > ferruh ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable 31 times 2018-10-31 3:34 ` Zhao1, Wei 2018-11-05 14:30 ` Ferruh Yigit @ 2018-11-05 15:03 ` Ferruh Yigit 1 sibling, 0 replies; 5+ messages in thread From: Ferruh Yigit @ 2018-11-05 15:03 UTC (permalink / raw) To: Zhao1, Wei, Wu, Jingjing, Lu, Wenzhuo; +Cc: dev, stable On 10/31/2018 3:34 AM, Zhao1, Wei wrote: > > >> -----Original Message----- >> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Ferruh Yigit >> Sent: Sunday, October 28, 2018 11:52 AM >> To: Wu, Jingjing <jingjing.wu@intel.com>; Lu, Wenzhuo >> <wenzhuo.lu@intel.com> >> Cc: dev@dpdk.org; Yigit, Ferruh <ferruh.yigit@intel.com>; stable@dpdk.org >> Subject: [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable >> 31 times >> >> Fixes: e5b2a9e957e7 ("net/avf/base: add base code for avf PMD") >> Cc: stable@dpdk.org >> >> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com> <...> > Reviewed-by: Wei Zhao <wei.zhao1@intel.com> Applied to dpdk-next-net/master, thanks. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-11-07 2:42 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-10-28 3:51 [dpdk-dev] [PATCH] net/avf/base: fix shifting 32 bits signed variable 31 times Ferruh Yigit 2018-10-31 3:34 ` Zhao1, Wei 2018-11-05 14:30 ` Ferruh Yigit 2018-11-07 2:42 ` Zhao1, Wei 2018-11-05 15:03 ` Ferruh Yigit
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