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Fri, 24 Jul 2026 08:44:32 -0700 (PDT) List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@FreeBSD.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 References: <6a5fba36.3d93d.694b6c5c@gitrepo.freebsd.org> In-Reply-To: From: Ed Maste Date: Fri, 24 Jul 2026 11:44:21 -0400 X-Gm-Features: AUfX_mzQfCux6ODoprvOxfAp7wOe25rBnAnLsD-spcSi88l_M6JK8UtdsTK6Q1I Message-ID: Subject: Re: git: caabdb3aefdc - main - contigmalloc.9: Note that M_WAITOK may still return NULL To: Mark Johnston Cc: Ryan Libby , src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Spamd-Result: default: False [-3.60 / 15.00]; ARC_ALLOW(-1.00)[google.com:s=arc-20260327:i=1]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-0.99)[-0.990]; NEURAL_HAM_SHORT(-0.61)[-0.611]; FORGED_SENDER(0.30)[emaste@freebsd.org,carpeddiem@gmail.com]; R_SPF_ALLOW(-0.20)[+ip4:209.85.128.0/17:c]; MIME_GOOD(-0.10)[text/plain]; DMARC_POLICY_SOFTFAIL(0.10)[freebsd.org : SPF not aligned (relaxed), No valid DKIM,none]; RWL_MAILSPIKE_GOOD(-0.10)[209.85.160.42:from]; PREVIOUSLY_DELIVERED(0.00)[dev-commits-src-all@freebsd.org]; MIME_TRACE(0.00)[0:+]; FREEFALL_USER(0.00)[carpeddiem]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; RCVD_COUNT_ONE(0.00)[1]; RCVD_TLS_LAST(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[209.85.160.42:from]; MLMMJ_DEST(0.00)[dev-commits-src-all@freebsd.org]; FROM_NEQ_ENVFROM(0.00)[emaste@freebsd.org,carpeddiem@gmail.com]; R_DKIM_NA(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MISSING_XM_UA(0.00)[]; RCPT_COUNT_FIVE(0.00)[5] X-Rspamd-Queue-Id: 4h6C3P68mcz3Y0v X-Spamd-Bar: --- > That said, I think the claim in the man page is actually wrong now. > contigmalloc(M_WAITOK) certainly used to be able to return NULL, but I > think that might no longer be true now that kmem_alloc_contig() is > implemented using domainset iterators. If we try all domains, we'll end > up sleeping and retrying indefinitely, or at least it appears to be that > way. Hmm, contigmalloc does check kmem_alloc_contig's return for NULL, so if this is the case we should probably make that a KASSERT instead.