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Wed, 03 Sep 2025 17:52:35 -0700 (PDT) From: Sam Edwards X-Google-Original-From: Sam Edwards To: Catalin Marinas , Will Deacon , Marc Zyngier Cc: Andrew Morton , Anshuman Khandual , Ard Biesheuvel , Ryan Roberts , Baruch Siach , Kevin Brodsky , Joey Gouly , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sam Edwards Subject: [PATCH v2 1/3] arm64: mm: Cast start/end markers to char *, not u64 Date: Wed, 3 Sep 2025 17:52:07 -0700 Message-ID: <20250904005209.1494370-2-CFSworks@gmail.com> X-Mailer: git-send-email 2.49.1 In-Reply-To: <20250904005209.1494370-1-CFSworks@gmail.com> References: <20250904005209.1494370-1-CFSworks@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There are a few memset() calls in map_kernel.c that cast marker-symbol addresses to u64 in order to perform pointer subtraction (range size computation). Cast them with (char *) instead, aligning with idiomatic C pointer arithmetic. This patch provably has no effect at runtime: I have verified that .text of vmlinux is identical after this change. Signed-off-by: Sam Edwards --- arch/arm64/kernel/pi/map_kernel.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kernel/pi/map_kernel.c b/arch/arm64/kernel/pi/map_k= ernel.c index 0f4bd7771859..2b3047860230 100644 --- a/arch/arm64/kernel/pi/map_kernel.c +++ b/arch/arm64/kernel/pi/map_kernel.c @@ -179,7 +179,7 @@ static void __init remap_idmap_for_lpa2(void) * Don't bother with the FDT, we no longer need it after this. */ memset(init_idmap_pg_dir, 0, - (u64)init_idmap_pg_end - (u64)init_idmap_pg_dir); + (char *)init_idmap_pg_end - (char *)init_idmap_pg_dir); =20 create_init_idmap(init_idmap_pg_dir, mask); dsb(ishst); @@ -188,7 +188,7 @@ static void __init remap_idmap_for_lpa2(void) set_ttbr0_for_lpa2((u64)init_idmap_pg_dir); =20 /* wipe the temporary ID map from memory */ - memset(init_pg_dir, 0, (u64)init_pg_end - (u64)init_pg_dir); + memset(init_pg_dir, 0, (char *)init_pg_end - (char *)init_pg_dir); } =20 static void __init map_fdt(u64 fdt) @@ -242,7 +242,7 @@ asmlinkage void __init early_map_kernel(u64 boot_status= , void *fdt) map_fdt((u64)fdt); =20 /* Clear BSS and the initial page tables */ - memset(__bss_start, 0, (u64)init_pg_end - (u64)__bss_start); + memset(__bss_start, 0, (char *)init_pg_end - (char *)__bss_start); =20 /* Parse the command line for CPU feature overrides */ chosen =3D fdt_path_offset(fdt, chosen_str); --=20 2.49.1