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AJvYcCWA6rgqNqRcNScE/Yv+GnB4M1eVWQbVrbyn8uARfUysvawN5UEMT2BViZXmGkfT1FwonEXIIKZ/Ouv+yfV7ayjT6rI= X-Gm-Message-State: AOJu0Yx3OKNL1Tn/7EFpSAvoVk/G7EsPnFBLiZrE5Xg2wnE0RTuszTst 5NvF2JjT+OLC8Ak5oK+gsEvftmx2VkCDqwmuk4BEEwHAuhFFNDl9SO3KZ7/Rt78G8/qcr2i0SA0 KFKMIFzeIuZZOfmwvczvWgVvUfX+mBuDEIhQOfw== X-Google-Smtp-Source: AGHT+IFHEaLZYyw0uAX0ZI/fr0dhZDQyZO1C7osqzysYutn76ux4Euc6Vx5ZcC+58/zciKXeEoXuHWH/QDBBa6btR7w= X-Received: by 2002:a05:622a:5b97:b0:42e:daf5:1b93 with SMTP id ec23-20020a05622a5b9700b0042edaf51b93mr11616575qtb.39.1710688542407; Sun, 17 Mar 2024 08:15:42 -0700 (PDT) MIME-Version: 1.0 References: <20240311164638.2015063-1-pasha.tatashin@soleen.com> <20240311164638.2015063-7-pasha.tatashin@soleen.com> <7e5d6e69-5f65-4b70-8220-6d98457ed17a@wanadoo.fr> In-Reply-To: <7e5d6e69-5f65-4b70-8220-6d98457ed17a@wanadoo.fr> From: Pasha Tatashin Date: Sun, 17 Mar 2024 11:15:06 -0400 Message-ID: Subject: Re: [RFC 06/14] fork: zero vmap stack using clear_page() instead of memset() To: Christophe JAILLET Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, x86@kernel.org, bp@alien8.de, brauner@kernel.org, bristot@redhat.com, bsegall@google.com, dave.hansen@linux.intel.com, dianders@chromium.org, dietmar.eggemann@arm.com, eric.devolder@oracle.com, hca@linux.ibm.com, hch@infradead.org, hpa@zytor.com, jacob.jun.pan@linux.intel.com, jgg@ziepe.ca, jpoimboe@kernel.org, jroedel@suse.de, juri.lelli@redhat.com, kent.overstreet@linux.dev, kinseyho@google.com, kirill.shutemov@linux.intel.com, lstoakes@gmail.com, luto@kernel.org, mgorman@suse.de, mic@digikod.net, michael.christie@oracle.com, mingo@redhat.com, mjguzik@gmail.com, mst@redhat.com, npiggin@gmail.com, peterz@infradead.org, pmladek@suse.com, rick.p.edgecombe@intel.com, rostedt@goodmis.org, surenb@google.com, tglx@linutronix.de, urezki@gmail.com, vincent.guittot@linaro.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 399A71C0010 X-Stat-Signature: ubohf1j7quccmwhr67bccoxog971jpur X-Rspam-User: X-HE-Tag: 1710688543-60234 X-HE-Meta: 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 1d28a+T4 1binCsOvO33O3BGhhHqOsAXa3dfn+KqBJ9n9pXvbNHJqUK8ZSsaLPiUaiDsQ1DyB5asyPsze1KfM8isYd27yJnwaYXQkxHRIVuAOhFrUQzVuKYLgBs4jp+JU6mkd3L/RdT1e0fVmRAZhwNhujArhGEMh8aRLVKc1ORumS85IwrxZyR7QuLWbfqfFe7dNFK85yPHHjSZUyuS/EQdhINZF7jY5vjnsAis1AfhUs8OKWbV6BUjXka+1HM9nA4KSqmX8MC/xWvX01nY76jS3SZhiQPljP0VlKfZZIZoJGPLujjNdwlq88hdRQRfFomNhsYjToLcls6JC/806/doN+XCOGfwlxC/lzsV3ANiCaUuAtoq4ufOpg25Pe/xQRogYuySVknhvkcPV8Hk5rFlg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.048037, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Mar 17, 2024 at 10:48=E2=80=AFAM Christophe JAILLET wrote: > > Le 11/03/2024 =C3=A0 17:46, Pasha Tatashin a =C3=A9crit : > > In preporation for dynamic kernel stacks do not zero the whole span of > > Nit: preparation Thank you, Pasha > > > the stack, but instead only the pages that are part of the vm_area. > > > > This is because with dynamic stacks we might have only partially > > populated stacks. > > > > Signed-off-by: Pasha Tatashin > > --- > > kernel/fork.c | 6 ++++-- > > 1 file changed, 4 insertions(+), 2 deletions(-) > > ... >