diff --git a/src/arch/riscv/sbi.c b/src/arch/riscv/sbi.c
index 654bef03d6..415ea9499d 100644
--- a/src/arch/riscv/sbi.c
+++ b/src/arch/riscv/sbi.c
@@ -59,7 +59,7 @@ void handle_sbi(trapframe *tf)
 {
 	uintptr_t ret = 0;
 	uintptr_t arg0 = tf->gpr[10];
-	__unused uintptr_t arg1 = tf->gpr[11];
+	__maybe_unused uintptr_t arg1 = tf->gpr[11];
 	uintptr_t which = tf->gpr[17];
 
 	switch (which) {
diff --git a/src/commonlib/bsd/include/commonlib/bsd/compiler.h b/src/commonlib/bsd/include/commonlib/bsd/compiler.h
index 42f9235e8e..aada973749 100644
--- a/src/commonlib/bsd/include/commonlib/bsd/compiler.h
+++ b/src/commonlib/bsd/include/commonlib/bsd/compiler.h
@@ -15,8 +15,21 @@
 #define __aligned(x) __attribute__((__aligned__(x)))
 #endif
 
-#ifndef __unused
-#define __unused __attribute__((__unused__))
+/* Because there may be variables/parameters whose name contains "__unused" in
+   header files of libc, namely musl, these names consistent with ones in the
+   Linux kernel may be a better choice. */
+
+/* This is used to mark identifiers unused in all conditions, e.g. a parameter
+   completely unused in all code branch, only present to fit an API. */
+#ifndef __always_unused
+#define __always_unused __attribute__((__unused__))
+#endif
+
+/* This is used to mark identifiers unused in some conditions, e.g. a parameter
+   only unused in some code branches, a global variable only accessed with code
+   being conditionally preprocessed, etc. */
+#ifndef __maybe_unused
+#define __maybe_unused __attribute__((__unused__))
 #endif
 
 #ifndef __must_check
diff --git a/src/commonlib/region.c b/src/commonlib/region.c
index 04c3180754..252f6faf12 100644
--- a/src/commonlib/region.c
+++ b/src/commonlib/region.c
@@ -222,7 +222,7 @@ void xlate_window_init(struct xlate_window *window, const struct region_device *
 }
 
 static void *mdev_mmap(const struct region_device *rd, size_t offset,
-			size_t size __unused)
+			size_t size __always_unused)
 {
 	const struct mem_region_device *mdev;
 
@@ -231,8 +231,8 @@ static void *mdev_mmap(const struct region_device *rd, size_t offset,
 	return &mdev->base[offset];
 }
 
-static int mdev_munmap(const struct region_device *rd __unused,
-			void *mapping __unused)
+static int mdev_munmap(const struct region_device *rd __always_unused,
+			void *mapping __always_unused)
 {
 	return 0;
 }
@@ -368,7 +368,8 @@ static void *xlate_mmap(const struct region_device *rd, size_t offset,
 	return rdev_mmap(xlwindow->access_dev, offset, size);
 }
 
-static int xlate_munmap(const struct region_device *rd __unused, void *mapping __unused)
+static int xlate_munmap(const struct region_device *rd __always_unused,
+			void *mapping __always_unused)
 {
 	/*
 	 * xlate_region_device does not keep track of the access device that was used to service
diff --git a/src/drivers/crb/tis.c b/src/drivers/crb/tis.c
index 95b0656d96..c3cc3e790d 100644
--- a/src/drivers/crb/tis.c
+++ b/src/drivers/crb/tis.c
@@ -127,7 +127,7 @@ static const char *crb_tpm_acpi_name(const struct device *dev)
 	return "TPM";
 }
 
-static struct device_operations __unused crb_ops = {
+static struct device_operations __maybe_unused crb_ops = {
 	.read_resources = noop_read_resources,
 	.set_resources = noop_set_resources,
 #if CONFIG(HAVE_ACPI_TABLES)
diff --git a/src/drivers/spi/spi_sdcard.c b/src/drivers/spi/spi_sdcard.c
index 0a18953395..e930b50b13 100644
--- a/src/drivers/spi/spi_sdcard.c
+++ b/src/drivers/spi/spi_sdcard.c
@@ -210,7 +210,7 @@ static int lookup_response_length(int response_type)
 static int response_resolve(int response_type, uint8_t *response,
 	uint32_t *out_register)
 {
-	__unused static const char * const sd_err[] = {
+	__maybe_unused static const char * const sd_err[] = {
 		"Card is locked",
 		"wp erase skip | lock/unlok cmd failed",
 		"error",
diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c
index b0b4de7d45..6604abd49e 100644
--- a/src/ec/google/chromeec/ec.c
+++ b/src/ec/google/chromeec/ec.c
@@ -219,7 +219,7 @@ static int google_chromeec_clear_mask(uint8_t type, uint64_t mask)
 						EC_HOST_EVENT_CLEAR, &mask);
 }
 
-static int __unused google_chromeec_set_mask(uint8_t type, uint64_t mask)
+static int google_chromeec_set_mask(uint8_t type, uint64_t mask)
 {
 	if (google_chromeec_is_uhepi_supported())
 		return google_chromeec_uhepi_cmd(type,
diff --git a/src/soc/amd/common/block/lpc/spi_dma.c b/src/soc/amd/common/block/lpc/spi_dma.c
index 97ba2be244..8fbd9bd710 100644
--- a/src/soc/amd/common/block/lpc/spi_dma.c
+++ b/src/soc/amd/common/block/lpc/spi_dma.c
@@ -26,7 +26,8 @@ struct spi_dma_transaction {
 	size_t remaining;
 };
 
-static void *spi_dma_mmap(const struct region_device *rd, size_t offset, size_t size __unused)
+static void *spi_dma_mmap(const struct region_device *rd, size_t offset,
+			  size_t size __always_unused)
 {
 	const struct mem_region_device *mdev;
 
@@ -35,7 +36,8 @@ static void *spi_dma_mmap(const struct region_device *rd, size_t offset, size_t
 	return &mdev->base[offset];
 }
 
-static int spi_dma_munmap(const struct region_device *rd __unused, void *mapping __unused)
+static int spi_dma_munmap(const struct region_device *rd __always_unused,
+			  void *mapping __always_unused)
 {
 	return 0;
 }
diff --git a/src/soc/amd/common/psp_verstage/boot_dev.c b/src/soc/amd/common/psp_verstage/boot_dev.c
index 5b25d59624..4ee78b8349 100644
--- a/src/soc/amd/common/psp_verstage/boot_dev.c
+++ b/src/soc/amd/common/psp_verstage/boot_dev.c
@@ -11,7 +11,8 @@
 
 #define DEST_BUF_ALIGNMENT 16
 
-static void *boot_dev_mmap(const struct region_device *rd, size_t offset, size_t size __unused)
+static void *boot_dev_mmap(const struct region_device *rd, size_t offset,
+			   size_t size __always_unused)
 {
 	const struct mem_region_device *mdev;
 
@@ -20,7 +21,8 @@ static void *boot_dev_mmap(const struct region_device *rd, size_t offset, size_t
 	return &(mdev->base[offset]);
 }
 
-static int boot_dev_munmap(const struct region_device *rd __unused, void *mapping __unused)
+static int boot_dev_munmap(const struct region_device *rd __always_unused,
+			   void *mapping __always_unused)
 {
 	return 0;
 }
diff --git a/src/southbridge/intel/ibexpeak/me.c b/src/southbridge/intel/ibexpeak/me.c
index 15d8402d8b..30d73a6f78 100644
--- a/src/southbridge/intel/ibexpeak/me.c
+++ b/src/southbridge/intel/ibexpeak/me.c
@@ -24,7 +24,7 @@
 #include "pch.h"
 
 /* Path that the BIOS should take based on ME state */
-static const char *me_bios_path_values[] __unused = {
+static const char *me_bios_path_values[] = {
 	[ME_NORMAL_BIOS_PATH]		= "Normal",
 	[ME_S3WAKE_BIOS_PATH]		= "S3 Wake",
 	[ME_ERROR_BIOS_PATH]		= "Error",
diff --git a/util/cbfstool/cbfstool.c b/util/cbfstool/cbfstool.c
index ff10131e47..87b5d00f19 100644
--- a/util/cbfstool/cbfstool.c
+++ b/util/cbfstool/cbfstool.c
@@ -1499,7 +1499,7 @@ static int cbfs_layout(void)
 	return 0;
 }
 
-static enum cb_err verify_walker(__unused cbfs_dev_t dev, size_t offset,
+static enum cb_err verify_walker(__always_unused cbfs_dev_t dev, size_t offset,
 				 const union cbfs_mdata *mdata, size_t already_read, void *arg)
 {
 	uint32_t type = be32toh(mdata->h.type);
diff --git a/util/sconfig/main.c b/util/sconfig/main.c
index 1de98d481a..6648254d0a 100644
--- a/util/sconfig/main.c
+++ b/util/sconfig/main.c
@@ -1970,7 +1970,7 @@ static void generate_outputc(FILE *f, const char *static_header)
 	fprintf(f, "#include <fw_config.h>\n");
 	fprintf(f, "#include <%s>\n", static_header);
 	emit_chip_headers(f, chip_header.next);
-	fprintf(f, "\n#define STORAGE static __unused DEVTREE_CONST\n\n");
+	fprintf(f, "\n#define STORAGE static __maybe_unused DEVTREE_CONST\n\n");
 
 	walk_device_tree(NULL, NULL, &base_root_dev, inherit_subsystem_ids);
 	fprintf(f, "\n/* pass 0 */\n");