Subject: [PATCH 8/8] arch: use rest_of_page() macro where appropriate

From: Yury Norov <[email-masked]>
Date: Tue, 3 Mar 2026 20:27:16 -0500

Switch arch code to using the macro. No functional changes intended.

Signed-off-by: Yury Norov <[email-masked]>
---
 arch/arm64/kernel/patching.c     | 4 +---
 arch/powerpc/lib/code-patching.c | 6 +++---
 arch/riscv/kernel/sbi.c          | 4 ++--
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/kernel/patching.c b/arch/arm64/kernel/patching.c
index 1041bc67a3ee..4c3a4401719b 100644
--- a/arch/arm64/kernel/patching.c
+++ b/arch/arm64/kernel/patching.c
@@ -116,9 +116,7 @@ static void *__text_poke(text_poke_f func, void *addr, void *src, size_t len)
 
 	while (patched < len) {
 		ptr = addr + patched;
-		size = min_t(size_t, PAGE_SIZE - offset_in_page(ptr),
-			     len - patched);
-
+		size = min_t(size_t, rest_of_page(ptr), len - patched);
 		waddr = patch_map(ptr, FIX_TEXT_POKE0);
 		func(waddr, src, patched, size);
 		patch_unmap(FIX_TEXT_POKE0);
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index f84e0337cc02..186a9cb79ee3 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -463,7 +463,7 @@ static int __patch_instructions(u32 *patch_addr, u32 *code, size_t len, bool rep
 
 /*
  * A page is mapped and instructions that fit the page are patched.
- * Assumes 'len' to be (PAGE_SIZE - offset_in_page(addr)) or below.
+ * Assumes 'len' to be rest_of_page(addr) or below.
  */
 static int __do_patch_instructions_mm(u32 *addr, u32 *code, size_t len, bool repeat_instr)
 {
@@ -514,7 +514,7 @@ static int __do_patch_instructions_mm(u32 *addr, u32 *code, size_t len, bool rep
 
 /*
  * A page is mapped and instructions that fit the page are patched.
- * Assumes 'len' to be (PAGE_SIZE - offset_in_page(addr)) or below.
+ * Assumes 'len' to be rest_of_page(addr) or below.
  */
 static int __do_patch_instructions(u32 *addr, u32 *code, size_t len, bool repeat_instr)
 {
@@ -554,7 +554,7 @@ int patch_instructions(u32 *addr, u32 *code, size_t len, bool repeat_instr)
 		size_t plen;
 		int err;
 
-		plen = min_t(size_t, PAGE_SIZE - offset_in_page(addr), len);
+		plen = min_t(size_t, rest_of_page(addr), len);
 
 		local_irq_save(flags);
 		if (mm_patch_enabled())
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
index c443337056ab..9a2f656f776f 100644
--- a/arch/riscv/kernel/sbi.c
+++ b/arch/riscv/kernel/sbi.c
@@ -602,7 +602,7 @@ int sbi_debug_console_write(const char *bytes, unsigned int num_bytes)
 	else
 		base_addr = __pa(bytes);
 	if (PAGE_SIZE < (offset_in_page(bytes) + num_bytes))
-		num_bytes = PAGE_SIZE - offset_in_page(bytes);
+		num_bytes = rest_of_page(bytes);
 
 	if (IS_ENABLED(CONFIG_32BIT))
 		ret = sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE,
@@ -631,7 +631,7 @@ int sbi_debug_console_read(char *bytes, unsigned int num_bytes)
 	else
 		base_addr = __pa(bytes);
 	if (PAGE_SIZE < (offset_in_page(bytes) + num_bytes))
-		num_bytes = PAGE_SIZE - offset_in_page(bytes);
+		num_bytes = rest_of_page(bytes);
 
 	if (IS_ENABLED(CONFIG_32BIT))
 		ret = sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_READ,
-- 
2.43.0