[PATCH 09/22] [v2] arch: fix asm-offsets.c building with -Wmissing-prototypes
From: Arnd Bergmann <arnd@kernel.org>
Date: 2023-11-08 13:01:23
Also in:
dri-devel, linux-alpha, linux-bcachefs, linux-fbdev, linux-kbuild, linux-m68k, linux-mips, linux-riscv, linux-s390, linux-sh, linux-trace-kernel, linux-usb, lkml, loongarch, netdev, sparclinux
Subsystem:
alpha port, loongarch, sparc + ultrasparc (sparc/sparc64), the rest · Maintainers:
Richard Henderson, Matt Turner, Magnus Lindholm, Huacai Chen, "David S. Miller", Andreas Larsson, Linus Torvalds
From: Arnd Bergmann <arnd@arndb.de> When -Wmissing-prototypes is enabled, the some asm-offsets.c files fail to build, even when this warning is disabled in the Makefile for normal files: arch/sparc/kernel/asm-offsets.c:22:5: error: no previous prototype for 'sparc32_foo' [-Werror=missing-prototypes] arch/sparc/kernel/asm-offsets.c:48:5: error: no previous prototype for 'foo' [-Werror=missing-prototypes] Address this by making use of the same trick as x86, marking these functions as 'static __used' to avoid the need for a prototype by not drop them in dead-code elimination. Suggested-by: Masahiro Yamada <masahiroy@kernel.org> Link: https://lore.kernel.org/lkml/CAK7LNARfEmFk0Du4Hed19eX_G6tUC5wG0zP+L1AyvdpOF4ybXQ@mail.gmail.com/ (local) Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- v2: rewrite using a different approach --- arch/alpha/kernel/asm-offsets.c | 2 +- arch/loongarch/kernel/asm-offsets.c | 26 +++++++++++++------------- arch/sparc/kernel/asm-offsets.c | 6 +++--- 3 files changed, 17 insertions(+), 17 deletions(-)
diff --git a/arch/alpha/kernel/asm-offsets.c b/arch/alpha/kernel/asm-offsets.c
index b121294bee26..bf1eedd27cf7 100644
--- a/arch/alpha/kernel/asm-offsets.c
+++ b/arch/alpha/kernel/asm-offsets.c@@ -12,7 +12,7 @@ #include <linux/kbuild.h> #include <asm/io.h> -void foo(void) +static void __used foo(void) { DEFINE(TI_TASK, offsetof(struct thread_info, task)); DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
diff --git a/arch/loongarch/kernel/asm-offsets.c b/arch/loongarch/kernel/asm-offsets.c
index 173fe514fc9e..bee9f7a3108f 100644
--- a/arch/loongarch/kernel/asm-offsets.c
+++ b/arch/loongarch/kernel/asm-offsets.c@@ -15,7 +15,7 @@ #include <asm/processor.h> #include <asm/ftrace.h> -void output_ptreg_defines(void) +static void __used output_ptreg_defines(void) { COMMENT("LoongArch pt_regs offsets."); OFFSET(PT_R0, pt_regs, regs[0]);
@@ -62,7 +62,7 @@ void output_ptreg_defines(void) BLANK(); } -void output_task_defines(void) +static void __used output_task_defines(void) { COMMENT("LoongArch task_struct offsets."); OFFSET(TASK_STATE, task_struct, __state);
@@ -77,7 +77,7 @@ void output_task_defines(void) BLANK(); } -void output_thread_info_defines(void) +static void __used output_thread_info_defines(void) { COMMENT("LoongArch thread_info offsets."); OFFSET(TI_TASK, thread_info, task);
@@ -93,7 +93,7 @@ void output_thread_info_defines(void) BLANK(); } -void output_thread_defines(void) +static void __used output_thread_defines(void) { COMMENT("LoongArch specific thread_struct offsets."); OFFSET(THREAD_REG01, task_struct, thread.reg01);
@@ -129,7 +129,7 @@ void output_thread_defines(void) BLANK(); } -void output_thread_fpu_defines(void) +static void __used output_thread_fpu_defines(void) { OFFSET(THREAD_FPR0, loongarch_fpu, fpr[0]); OFFSET(THREAD_FPR1, loongarch_fpu, fpr[1]);
@@ -170,7 +170,7 @@ void output_thread_fpu_defines(void) BLANK(); } -void output_thread_lbt_defines(void) +static void __used output_thread_lbt_defines(void) { OFFSET(THREAD_SCR0, loongarch_lbt, scr0); OFFSET(THREAD_SCR1, loongarch_lbt, scr1);
@@ -180,7 +180,7 @@ void output_thread_lbt_defines(void) BLANK(); } -void output_mm_defines(void) +static void __used output_mm_defines(void) { COMMENT("Size of struct page"); DEFINE(STRUCT_PAGE_SIZE, sizeof(struct page));
@@ -212,7 +212,7 @@ void output_mm_defines(void) BLANK(); } -void output_sc_defines(void) +static void __used output_sc_defines(void) { COMMENT("Linux sigcontext offsets."); OFFSET(SC_REGS, sigcontext, sc_regs);
@@ -220,7 +220,7 @@ void output_sc_defines(void) BLANK(); } -void output_signal_defines(void) +static void __used output_signal_defines(void) { COMMENT("Linux signal numbers."); DEFINE(_SIGHUP, SIGHUP);
@@ -258,7 +258,7 @@ void output_signal_defines(void) } #ifdef CONFIG_SMP -void output_smpboot_defines(void) +static void __used output_smpboot_defines(void) { COMMENT("Linux smp cpu boot offsets."); OFFSET(CPU_BOOT_STACK, secondary_data, stack);
@@ -268,7 +268,7 @@ void output_smpboot_defines(void) #endif #ifdef CONFIG_HIBERNATION -void output_pbe_defines(void) +static void __used output_pbe_defines(void) { COMMENT("Linux struct pbe offsets."); OFFSET(PBE_ADDRESS, pbe, address);
@@ -280,7 +280,7 @@ void output_pbe_defines(void) #endif #ifdef CONFIG_FUNCTION_GRAPH_TRACER -void output_fgraph_ret_regs_defines(void) +static void __used output_fgraph_ret_regs_defines(void) { COMMENT("LoongArch fgraph_ret_regs offsets."); OFFSET(FGRET_REGS_A0, fgraph_ret_regs, regs[0]);
@@ -291,7 +291,7 @@ void output_fgraph_ret_regs_defines(void) } #endif -void output_kvm_defines(void) +static void __used output_kvm_defines(void) { COMMENT("KVM/LoongArch Specific offsets.");
diff --git a/arch/sparc/kernel/asm-offsets.c b/arch/sparc/kernel/asm-offsets.c
index 5784f2df489a..3d9b9855dce9 100644
--- a/arch/sparc/kernel/asm-offsets.c
+++ b/arch/sparc/kernel/asm-offsets.c@@ -19,14 +19,14 @@ #include <asm/hibernate.h> #ifdef CONFIG_SPARC32 -int sparc32_foo(void) +static int __used sparc32_foo(void) { DEFINE(AOFF_thread_fork_kpsr, offsetof(struct thread_struct, fork_kpsr)); return 0; } #else -int sparc64_foo(void) +static int __used sparc64_foo(void) { #ifdef CONFIG_HIBERNATION BLANK();
@@ -45,7 +45,7 @@ int sparc64_foo(void) } #endif -int foo(void) +static int __used foo(void) { BLANK(); DEFINE(AOFF_task_thread, offsetof(struct task_struct, thread));
--
2.39.2