[PATCH bpf-next v3 1/2] bpf: Remove arch_unprotect_bpf_trampoline()

[Christophe Leroy]

Last user of arch_unprotect_bpf_trampoline() was removed by
commit 187e2af05abe ("bpf: struct_ops supports more than one page for
trampolines.")

Remove arch_unprotect_bpf_trampoline()

Reported-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Fixes: 187e2af05abe ("bpf: struct_ops supports more than one page for trampolines.")
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
v3: New
---
 arch/arm64/net/bpf_jit_comp.c | 4 ----
 arch/x86/net/bpf_jit_comp.c   | 4 ----
 include/linux/bpf.h           | 1 -
 kernel/bpf/trampoline.c       | 7 -------
 4 files changed, 16 deletions(-)

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index c5b461dda438..132c8ffba109 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -2180,10 +2180,6 @@ void arch_protect_bpf_trampoline(void *image, unsigned int size)
 {
 }
 
-void arch_unprotect_bpf_trampoline(void *image, unsigned int size)
-{
-}
-
 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *ro_image,
 				void *ro_image_end, const struct btf_func_model *m,
 				u32 flags, struct bpf_tramp_links *tlinks,
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index a7ba8e178645..7a56d2d84512 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -3008,10 +3008,6 @@ void arch_protect_bpf_trampoline(void *image, unsigned int size)
 {
 }
 
-void arch_unprotect_bpf_trampoline(void *image, unsigned int size)
-{
-}
-
 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end,
 				const struct btf_func_model *m, u32 flags,
 				struct bpf_tramp_links *tlinks,
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 4f20f62f9d63..d89bdefb42e2 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1117,7 +1117,6 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
 void *arch_alloc_bpf_trampoline(unsigned int size);
 void arch_free_bpf_trampoline(void *image, unsigned int size);
 void arch_protect_bpf_trampoline(void *image, unsigned int size);
-void arch_unprotect_bpf_trampoline(void *image, unsigned int size);
 int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
 			     struct bpf_tramp_links *tlinks, void *func_addr);
 
diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
index db7599c59c78..04fd1abd3661 100644
--- a/kernel/bpf/trampoline.c
+++ b/kernel/bpf/trampoline.c
@@ -1078,13 +1078,6 @@ void __weak arch_protect_bpf_trampoline(void *image, unsigned int size)
 	set_memory_rox((long)image, 1);
 }
 
-void __weak arch_unprotect_bpf_trampoline(void *image, unsigned int size)
-{
-	WARN_ON_ONCE(size > PAGE_SIZE);
-	set_memory_nx((long)image, 1);
-	set_memory_rw((long)image, 1);
-}
-
 int __weak arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
 				    struct bpf_tramp_links *tlinks, void *func_addr)
 {
-- 
2.43.0