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Howlett (Google)" Cc: SJ Park , Andrew Morton , Lorenzo Stoakes , Matthew Wilcox , Vlastimil Babka , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] tools/testing/shared: catch a failed posix_memalign() Date: Tue, 20 Oct 2026 17:12:07 -0700 Message-ID: <20261021001208.93708-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261020033128.1934349-1-liam@infradead.org> References: X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 43CDF20006 X-Stat-Signature: 4cjt9jybfj5w38k1czki1jymr3wxkqin X-Spam-Status: No, score=-14.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1792541536-19025 X-HE-Meta: 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 pSMnivyD 1/worVmoqmRD0lWkQzZrPZRlE7+/jD/psv1I5SiXVC9zVtAHvefp8SYc4sjhJhi/VV3UlpTBk9ElbbiIJkchVdJDO5Ra1nIWjNP7A1gABir+i4l7nu9nt7aTBt6JQH2zur2fg6FqjESUIp/3A05mchWCC+/RPqxAzvaj8nb6raS+zCy1JNniTMERVQm++x7hFw82OoCzwMVSH5Lvrz43JzD+9S+OT3feK56L6V28dUwcmFcHafkju8KiOA39A2yb1ooWUsQ1nPRRb0vzCuAddPZSifShRaLWzg51PNeVSpl+b+AAuQYwRHSSmZms/esTUoa6MWElOde6jalhBEMnWd6dapw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Mon, 19 Oct 2026 23:31:28 -0400 "Liam R. Howlett (Google)" wrote: > posix_memalign() returns zero or a positive error number and never sets > errno, so the checks for a negative return in kmem_cache_alloc_lru() and > kmem_cache_alloc_bulk() is not possible. A failed aligned allocation > carries on with the pointer unset, into the constructor or the memset(). > > Test for any non-zero return. Nice catch, makes sense to me. > > Signed-off-by: Liam R. Howlett (Google) Reviewed-by: SJ Park Thanks, SJ [...]