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a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1703785155; x=1735321155; h=message-id:date:subject:to:cc:references:from: in-reply-to:content-transfer-encoding:mime-version; bh=9Mv4CK/eDYVJpD515njvi6tqst2StMNa2L64IfGAYQE=; b=RZMpCg89xyqo62KVnhv5yC4q5S5vczRCuP8dPK1AF/K3rU0c5J9QIhye jS0qFcXpqNs3CrToyuorj0uS5Lwl+CZy9W5SxwwkLHh6f0mTG1mUtLx2X yu0soMTs9wHAa4hcNhwom6mO/eJB/Ip7W12zhO1Sp51x+P0hFt8ijBJV0 sbI2Czhtc9+pQ2COlPVuX7PG6eJ8wZVJQiDyzNIYvDeBFfZKWweMYfXYa OesPf02oQAOccTiRp/eK8LamzeCmO4TxZAwaF8wpj29i5aqAT4RjxDCQD b5L8fEaIHKo+rip+HDDLnyvrdFf/31u/lQkkoIEDfSG9yn8hRD//J+WTk g==; X-Mailman-Original-Authentication-Results: smtp2.osuosl.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=RZMpCg89 X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Subject: Re: [Intel-wired-lan] [PATCH iwl-net] idpf: avoid compiler padding in virtchnl2_ptype struct X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org, przemyslaw.kitszel@intel.com Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 12/27/2023 1:45 PM, Paul Menzel wrote: > Dear Pavan, > > > Thank you for yoru patch. > > Am 27.12.23 um 18:37 schrieb Pavan Kumar Linga: >> Config option in arm random config file > > Sorry, I do not understand this part of the sentence. What Kconfig > option was selected exactly causing this behavior. > Apologies as I couldn't find the config option that was causing this. As the driver compilation with arm rand config was failing, posted the fix first. Will debug further to find the config option that resulted in this failure. Thanks for the review. >> is causing the compiler >> to add padding. Avoid it by using "__packed" structure attribute >> for virtchnl2_ptype struct. > > Did the compiler emit a warning? If so, please paste it. > Here is the compiler error and also will update the commit message with the error: include/linux/build_bug.h:78:41: error: static assertion failed: "(6) == sizeof(struct virtchnl2_ptype)" 78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg) | ^~~~~~~~~~~~~~ include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert' 77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr) | ^~~~~~~~~~~~~~~ drivers/net/ethernet/intel/idpf/virtchnl2.h:26:9: note: in expansion of macro 'static_assert' 26 | static_assert((n) == sizeof(struct X)) | ^~~~~~~~~~~~~ drivers/net/ethernet/intel/idpf/virtchnl2.h:982:1: note: in expansion of macro 'VIRTCHNL2_CHECK_STRUCT_LEN' 982 | VIRTCHNL2_CHECK_STRUCT_LEN(6, virtchnl2_ptype); | ^~~~~~~~~~~~~~~~~~~~~~~~~~ Regards, Pavan >> Fixes: 0d7502a9b4a7 ("virtchnl: add virtchnl version 2 ops") >> Reported-by: kernel test robot >> Closes: >> https://lore.kernel.org/oe-kbuild-all/202312220250.ufEm8doQ-lkp@intel.com >> Reviewed-by: Przemek Kitszel >> Signed-off-by: Pavan Kumar Linga >> --- >>   drivers/net/ethernet/intel/idpf/virtchnl2.h | 2 +- >>   1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/net/ethernet/intel/idpf/virtchnl2.h >> b/drivers/net/ethernet/intel/idpf/virtchnl2.h >> index 8dc83788972..dd750e6dcd0 100644 >> --- a/drivers/net/ethernet/intel/idpf/virtchnl2.h >> +++ b/drivers/net/ethernet/intel/idpf/virtchnl2.h >> @@ -978,7 +978,7 @@ struct virtchnl2_ptype { >>       u8 proto_id_count; >>       __le16 pad; >>       __le16 proto_id[]; >> -}; >> +} __packed; >>   VIRTCHNL2_CHECK_STRUCT_LEN(6, virtchnl2_ptype); >>   /** > > Reviewed-by: Paul Menzel > > > > Kind regards, > > Paul