diff mbox series

[RFC,v2,riscv/for-next,2/5] riscv: export patch_insn_write

Message ID 20220913094252.3555240-3-andy.chiu@sifive.com (mailing list archive)
State New, archived
Headers show
Series Enable ftrace with kernel preemption for RISC-V | expand

Commit Message

Andy Chiu Sept. 13, 2022, 9:42 a.m. UTC 
So that we may patch code without issuing fence.i

Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
---
 arch/riscv/include/asm/patch.h | 1 +
 arch/riscv/kernel/patch.c      | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/riscv/include/asm/patch.h b/arch/riscv/include/asm/patch.h
index 9a7d7346001e..327e99114d67 100644
--- a/arch/riscv/include/asm/patch.h
+++ b/arch/riscv/include/asm/patch.h
@@ -6,6 +6,7 @@ 
 #ifndef _ASM_RISCV_PATCH_H
 #define _ASM_RISCV_PATCH_H
 
+int patch_insn_write(void *addr, const void *insn, size_t len);
 int patch_text_nosync(void *addr, const void *insns, size_t len);
 int patch_text(void *addr, u32 insn);
 
diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c
index 765004b60513..6f7757ce50dc 100644
--- a/arch/riscv/kernel/patch.c
+++ b/arch/riscv/kernel/patch.c
@@ -49,7 +49,7 @@  static void patch_unmap(int fixmap)
 }
 NOKPROBE_SYMBOL(patch_unmap);
 
-static int patch_insn_write(void *addr, const void *insn, size_t len)
+int patch_insn_write(void *addr, const void *insn, size_t len)
 {
 	void *waddr = addr;
 	bool across_pages = (((uintptr_t) addr & ~PAGE_MASK) + len) > PAGE_SIZE;
@@ -78,7 +78,7 @@  static int patch_insn_write(void *addr, const void *insn, size_t len)
 }
 NOKPROBE_SYMBOL(patch_insn_write);
 #else
-static int patch_insn_write(void *addr, const void *insn, size_t len)
+int patch_insn_write(void *addr, const void *insn, size_t len)
 {
 	return copy_to_kernel_nofault(addr, insn, len);
 }