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[67.164.59.41]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-127899eab46sm17006945c88.8.2026.03.03.12.04.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Mar 2026 12:04:55 -0800 (PST) Date: Tue, 3 Mar 2026 12:04:53 -0800 From: "Vishal Moola (Oracle)" To: "Uladzislau Rezki (Sony)" Cc: linux-mm@kvack.org, Andrew Morton , Michal Hocko , Mikulas Patocka , Baoquan He , LKML Subject: Re: [PATCH] mm/vmalloc: Fix incorrect size reporting on allocation failure Message-ID: References: <20260302114740.2668450-1-urezki@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260302114740.2668450-1-urezki@gmail.com> X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: B258C14000C X-Stat-Signature: odjsu4hcecje6613jqo5ugqfy56gp3du X-Rspam-User: X-HE-Tag: 1772568297-435163 X-HE-Meta: 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 LnBgTfSr 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Mar 02, 2026 at 12:47:39PM +0100, Uladzislau Rezki (Sony) wrote: > When __vmalloc_area_node() fails to allocate pages, the failure > message may report an incorrect allocation size, for example: > > vmalloc error: size 0, failed to allocate pages, ... > > This happens because the warning prints area->nr_pages * PAGE_SIZE. > At this point, area->nr_pages may be zero or partly populated thus > it is not valid. > > Report the originally requested allocation size instead by using > nr_small_pages * PAGE_SIZE, which reflects the actual number of > pages being requested by user. > > Signed-off-by: Uladzislau Rezki (Sony) Reviewed-by: Vishal Moola (Oracle)