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[34.168.149.56]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2c42fbb5411sm172146015ad.32.2026.06.17.15.55.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 15:55:05 -0700 (PDT) Date: Wed, 17 Jun 2026 22:55:02 +0000 From: David Matlack To: Alex Mastro Cc: Alex Williamson , Shuah Khan , Raghavendra Rao Ananta , Vipin Sharma , kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Shuah Khan Subject: Re: [PATCH v4 0/2] vfio: selftests: Add allocation assert helpers and avoid VLAs Message-ID: References: <20260617-scratch-amastro-vfio-selftests-avoid-vlas-v4-0-b9f52f1e2c5a@fb.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260617-scratch-amastro-vfio-selftests-avoid-vlas-v4-0-b9f52f1e2c5a@fb.com> On 2026-06-17 11:57 AM, Alex Mastro wrote: > Add VFIO selftest {malloc,calloc}_assert() helpers, then use > them in places that open-code malloc() or calloc() followed by > VFIO_ASSERT_NOT_NULL(). Thanks! > Use the helpers to replace VLAs with heap allocations. This avoids GCC > rejecting initialized VLAs and avoids treating a u8 buffer as a possibly > under-aligned VFIO request struct. > > Changes in v4: > - Add malloc_assert(). > - Link to v3: https://patch.msgid.link/20260615-scratch-amastro-vfio-selftests-avoid-vlas-v3-0-b3798415c72a@fb.com > > Changes in v3: > - Add the calloc_assert() helper as a precursor patch. > - Convert existing VFIO selftest calloc() assertion sites. > - Update the VLA fix to use calloc_assert(). > - Link to v2: https://patch.msgid.link/20260615-scratch-amastro-vfio-selftests-avoid-vlas-v2-1-4e4df462908a@fb.com > > Changes in v2: > - Reverse xmas tree variable ordering > - Link to v1: https://patch.msgid.link/20260612-scratch-amastro-vfio-selftests-avoid-vlas-v1-1-ba3acb635f0a@fb.com > > Signed-off-by: Alex Mastro > --- > Alex Mastro (2): > vfio: selftests: Add allocation assert helpers > vfio: selftests: Avoid VLAs Reviewed-by: David Matlack