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Thu, 10 Apr 2025 02:39:09 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH58iLdDzqdGntyE2VKnLoijlnQmAk7ttBrW2w43DvhiJHsiZDYkIrVlugmyYL5Ec5AwW0oA2vx0JLezD+2UN8= X-Received: by 2002:a2e:bd05:0:b0:30b:b9e4:13c5 with SMTP id 38308e7fff4ca-30fa41a55b1mr6736461fa.4.1744277949318; Thu, 10 Apr 2025 02:39:09 -0700 (PDT) MIME-Version: 1.0 References: <20250326103928.1189243-1-david.marchand@redhat.com> In-Reply-To: From: David Marchand Date: Thu, 10 Apr 2025 11:38:57 +0200 X-Gm-Features: ATxdqUECMpOpWxu6x3EqUZi1oXPLs1VEkkvspkpEeEZ0QxRHkgCMQdv4T4j2i-E Message-ID: Subject: Re: [PATCH] acl: fix build with GCC 15 on aarch64 To: David Marchand Cc: dev@dpdk.org, bluca@debian.org, stable@dpdk.org, Konstantin Ananyev , David Christensen , Wathsala Vithanage , Bruce Richardson X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: XVMOue_8WkqU3McV7TSnl_C0lAxdHXmzYPsZsKPUn2Y_1744277950 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org On Thu, Mar 27, 2025 at 7:06=E2=80=AFPM Bruce Richardson wrote: > > On Wed, Mar 26, 2025 at 11:39:28AM +0100, David Marchand wrote: > > Caught in OBS for Fedora Rawhide on aarch64: > > > > [ 198s] In file included from ../lib/acl/acl_run_neon.h:7, > > [ 198s] from ../lib/acl/acl_run_neon.c:5: > > [ 198s] In function =E2=80=98alloc_completion=E2=80=99, > > [ 198s] inlined from =E2=80=98acl_start_next_trie=E2=80=99 at > > ../lib/acl/acl_run.h:140:24, > > [ 198s] inlined from =E2=80=98search_neon_4.isra=E2=80=99 at > > ../lib/acl/acl_run_neon.h:239:20: > > [ 198s] ../lib/acl/acl_run.h:93:25: error: =E2=80=98cmplt=E2=80=99 may= be used > > uninitialized [-Werror=3Dmaybe-uninitialized] > > [ 198s] 93 | if (p[n].count =3D=3D 0) { > > [ 198s] | ~~~~^~~~~~ > > [ 198s] ../lib/acl/acl_run_neon.h: In function =E2=80=98search_neon_4.= isra=E2=80=99: > > [ 198s] ../lib/acl/acl_run_neon.h:230:27: note: =E2=80=98cmplt=E2=80= =99 declared here > > [ 198s] 230 | struct completion cmplt[4]; > > [ 198s] | ^~~~~ > > > > The code was resetting sequentially cmpl[].count at the exact index tha= t > > later call to alloc_completion uses. > > While this code seems correct, GCC 15 does not understand this (probabl= y > > when applying some optimisations). > > > > Instead, reset cmpl[].count all at once in acl_set_flow, and cleanup th= e > > various vectorized implementations accordingly. > > > > Bugzilla ID: 1678 > > Cc: stable@dpdk.org > > > > Signed-off-by: David Marchand > Acked-by: Bruce Richardson Applied as is, thanks. --=20 David Marchand