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Subject[tip: x86/mm] x86/ftrace: Remove SYSTEM_BOOTING exceptions
The following commit has been merged into the x86/mm branch of tip:

Commit-ID: 52a56f20bb7c34ed4b48466ad2d443165fad942f
Gitweb: https://git.kernel.org/tip/52a56f20bb7c34ed4b48466ad2d443165fad942f
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 25 Oct 2022 21:39:47 +02:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 01 Nov 2022 13:43:58 +01:00

x86/ftrace: Remove SYSTEM_BOOTING exceptions

Now that text_poke is available before ftrace, remove the
SYSTEM_BOOTING exceptions.

Specifically, this cures a W+X case during boot.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221025201057.945960823@infradead.org
---
arch/x86/kernel/alternative.c | 10 ----------
arch/x86/kernel/ftrace.c | 3 +--
2 files changed, 1 insertion(+), 12 deletions(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 5cadcea..e240351 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1681,11 +1681,6 @@ void __ref text_poke_queue(void *addr, const void *opcode, size_t len, const voi
{
struct text_poke_loc *tp;

- if (unlikely(system_state == SYSTEM_BOOTING)) {
- text_poke_early(addr, opcode, len);
- return;
- }
-
text_poke_flush(addr);

tp = &tp_vec[tp_vec_nr++];
@@ -1707,11 +1702,6 @@ void __ref text_poke_bp(void *addr, const void *opcode, size_t len, const void *
{
struct text_poke_loc tp;

- if (unlikely(system_state == SYSTEM_BOOTING)) {
- text_poke_early(addr, opcode, len);
- return;
- }
-
text_poke_loc_init(&tp, addr, opcode, len, emulate);
text_poke_bp_batch(&tp, 1);
}
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index bd16500..43628b8 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -415,8 +415,7 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)

set_vm_flush_reset_perms(trampoline);

- if (likely(system_state != SYSTEM_BOOTING))
- set_memory_ro((unsigned long)trampoline, npages);
+ set_memory_ro((unsigned long)trampoline, npages);
set_memory_x((unsigned long)trampoline, npages);
return (unsigned long)trampoline;
fail:
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