linux-kernel - [RFC PATCH V3 26/43] rv64ilp32_abi: file

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Message-Id: <20250325121624.523258-27-guoren@kernel.org>
Date: Tue, 25 Mar 2025 08:16:07 -0400
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Subject: [RFC PATCH V3 26/43] rv64ilp32_abi: file_ref: Use 32-bit width for refcnt

From: "Guo Ren (Alibaba DAMO Academy)" <guoren@...nel.org>

The sizeof(atomic_t) is 4 in rv64ilp32 abi linux kernel, which
could provide a higher density of cache and a smaller memory
footprint.

Signed-off-by: Guo Ren (Alibaba DAMO Academy) <guoren@...nel.org>
---
 include/linux/file_ref.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/file_ref.h b/include/linux/file_ref.h
index 9b3a8d9b17ab..ce9b47359e14 100644
--- a/include/linux/file_ref.h
+++ b/include/linux/file_ref.h
@@ -27,7 +27,7 @@
  * 0xFFFFFFFFFFFFFFFFUL
  */
 
-#ifdef CONFIG_64BIT
+#if BITS_PER_LONG == 64
 #define FILE_REF_ONEREF		0x0000000000000000UL
 #define FILE_REF_MAXREF		0x7FFFFFFFFFFFFFFFUL
 #define FILE_REF_SATURATED	0xA000000000000000UL
@@ -44,7 +44,7 @@
 #endif
 
 typedef struct {
-#ifdef CONFIG_64BIT
+#if BITS_PER_LONG == 64
 	atomic64_t refcnt;
 #else
 	atomic_t refcnt;
-- 
2.40.1