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[2003:dc:6f1d:f00:230:64ff:fe74:809]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b01902d0e99sm541005766b.12.2025.09.01.02.19.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Sep 2025 02:19:36 -0700 (PDT) From: Max Kellermann To: akpm@linux-foundation.org, david@redhat.com, axelrasmussen@google.com, yuanchu@google.com, willy@infradead.org, hughd@google.com, mhocko@suse.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, vishal.moola@gmail.com, linux@armlinux.org.uk, James.Bottomley@HansenPartnership.com, deller@gmx.de, agordeev@linux.ibm.com, gerald.schaefer@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, davem@davemloft.net, andreas@gaisler.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, chris@zankel.net, jcmvbkbc@gmail.com, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, weixugc@google.com, baolin.wang@linux.alibaba.com, rientjes@google.com, shakeel.butt@linux.dev, max.kellermann@ionos.com, thuth@redhat.com, broonie@kernel.org, osalvador@suse.de, jfalempe@redhat.com, mpe@ellerman.id.au, nysal@linux.ibm.com, linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v4 07/12] parisc: add `const` to mmap_upper_limit() parameter Date: Mon, 1 Sep 2025 11:19:10 +0200 Message-ID: <20250901091916.3002082-8-max.kellermann@ionos.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250901091916.3002082-1-max.kellermann@ionos.com> References: <20250901091916.3002082-1-max.kellermann@ionos.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 79670C0004 X-Stat-Signature: ursyrw6xgto6qzq7wxmiiuaatage5t9n X-Rspam-User: X-HE-Tag: 1756718378-492150 X-HE-Meta: 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 TL6UkB5I ZsD59uVmyw4ALRGkEs3NRYWUe+wQKCIGw+CLEuv/9kWb6GtVSbq/5z967jIW4DC8GLoyP5Mf8/FLCoRUumUrP3YiSZo5Iep6GLjn+YVBHAFFDkqpD1SrQy74St11IIR0Nl0r36gWkd6WM1Qgpmy+Th3PoEQpBIZ+YlBpYZgcxghMmKOoQ0plz8YbaeWJYAUIrhQxERAw+EleSxV9Yw3NTaQFLM3rdLsls1ddKVVWHDIaShj5QAqsWaWDqKl9BvwCiC0YARZBFY/NhCK+Zl0qCdDOQjXuw1fq0PbyPftES/r2udwlLMppUo4BQsqpwTB8UOISE25JCUzRFKZ5EFw+Ok6v8inlry7mcYxSjhC9Ef0VoGpvMxltnHf1uaKqnLh7UQv+Q2SJe8tOSMoqaphVEYn11tJ70EvB+IiXudl/qfRyg4a+9d1InbfxXmQ2/MrU6hgsZBL/pYTEZoHVNXK43U8UAbg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The memory management (mm) subsystem is a fundamental low-level component of the Linux kernel. Establishing const-correctness at this foundational level enables higher-level subsystems, such as filesystems and drivers, to also adopt const-correctness in their interfaces. This patch lays the groundwork for broader const-correctness throughout the kernel by starting with the core mm subsystem. This patch adds const qualifier to the rlimit pointer parameter in parisc's mmap_upper_limit() function that does not modify the referenced memory, improving type safety and enabling compiler optimizations. Functions improved: - mmap_upper_limit() Signed-off-by: Max Kellermann Reviewed-by: Vishal Moola (Oracle) --- arch/parisc/include/asm/processor.h | 2 +- arch/parisc/kernel/sys_parisc.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/parisc/include/asm/processor.h b/arch/parisc/include/asm/processor.h index 4c14bde39aac..dd0b5e199559 100644 --- a/arch/parisc/include/asm/processor.h +++ b/arch/parisc/include/asm/processor.h @@ -48,7 +48,7 @@ #ifndef __ASSEMBLER__ struct rlimit; -unsigned long mmap_upper_limit(struct rlimit *rlim_stack); +unsigned long mmap_upper_limit(const struct rlimit *rlim_stack); unsigned long calc_max_stack_size(unsigned long stack_max); /* diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c index f852fe274abe..c2bbaef7e6b7 100644 --- a/arch/parisc/kernel/sys_parisc.c +++ b/arch/parisc/kernel/sys_parisc.c @@ -77,7 +77,7 @@ unsigned long calc_max_stack_size(unsigned long stack_max) * indicating that "current" should be used instead of a passed-in * value from the exec bprm as done with arch_pick_mmap_layout(). */ -unsigned long mmap_upper_limit(struct rlimit *rlim_stack) +unsigned long mmap_upper_limit(const struct rlimit *const rlim_stack) { unsigned long stack_base; -- 2.47.2