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arm64: mm: Cast start/end markers to char *, not u64

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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 <CFSworks@gmail.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Sam Edwards
2025-09-03 17:52:07 -07:00
committed by Will Deacon
parent 8f5ae30d69
commit 030b3ffbda
1 changed files with 3 additions and 3 deletions
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6
arch/arm64/kernel/pi/map_kernel.c
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@@ -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);
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);
/* 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);
}
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);
/* 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);
/* Parse the command line for CPU feature overrides */
chosen = fdt_path_offset(fdt, chosen_str);