Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

087aa69a · Linus Torvalds <[email protected]> · 2022-09-11 07:48:21 -04:00

Pull arm64 fixes from Will Deacon:
 "Three small arm64 fixes, all related to optional architecture
  extensions: BTI, SME and 52-bit virtual addressing:

   - Disable in-kernel BTI when compiling with GCC, as it makes invalid
     assumptions about the distance between functions which has led to
     crashes when calling modules on a CPU with BTI support

   - Remove bogus TIF_SME flag management if memory allocation fails in
     the ptrace code

   - Fix the resume path when configured for 52-bit virtual addressing"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: mm: fix resume for 52-bit enabled builds
  arm64/ptrace: Don't clear calling process' TIF_SME on OOM
  arm64/bti: Disable in kernel BTI when cross section thunks are broken

Commit: 087aa69a9f2b2f1aaa173f976fec94058f623a9d
Parents: 6429883a · 3fe3fd5f

Merge commit. Changes below are compared with the first parent: 6429883a.

Changes

3 files changed · +5 −2

File	Status	Add	Del	Content
arch/arm64/Kconfig	modified	+2	−0	View file
arch/arm64/kernel/ptrace.c	modified	+0	−2	View file
arch/arm64/kernel/sleep.S	modified	+3	−0	View file

arch/arm64/Kconfig

View file

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 9fb9fff..1ce7685 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1887,6 +1887,8 @@ config ARM64_BTI_KERNEL
 	depends on CC_HAS_BRANCH_PROT_PAC_RET_BTI
 	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697
 	depends on !CC_IS_GCC || GCC_VERSION >= 100100
+	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106671
+	depends on !CC_IS_GCC
 	# https://github.com/llvm/llvm-project/commit/a88c722e687e6780dcd6a58718350dc76fcc4cc9
 	depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
 	depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS)

arch/arm64/kernel/ptrace.c

View file

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index eb7c08d..041d2ae 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1084,7 +1084,6 @@ static int za_set(struct task_struct *target,
 	if (!target->thread.sve_state) {
 		sve_alloc(target, false);
 		if (!target->thread.sve_state) {
-			clear_thread_flag(TIF_SME);
 			ret = -ENOMEM;
 			goto out;
 		}
@@ -1094,7 +1093,6 @@ static int za_set(struct task_struct *target,
 	sme_alloc(target);
 	if (!target->thread.za_state) {
 		ret = -ENOMEM;
-		clear_tsk_thread_flag(target, TIF_SME);
 		goto out;
 	}
 

arch/arm64/kernel/sleep.S

View file

diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S
index 617f78a..97c9de5 100644
--- a/arch/arm64/kernel/sleep.S
+++ b/arch/arm64/kernel/sleep.S
@@ -101,6 +101,9 @@ SYM_FUNC_END(__cpu_suspend_enter)
 SYM_CODE_START(cpu_resume)
 	bl	init_kernel_el
 	bl	finalise_el2
+#if VA_BITS > 48
+	ldr_l	x0, vabits_actual
+#endif
 	bl	__cpu_setup
 	/* enable the MMU early - so we can access sleep_save_stash by va */
 	adrp	x1, swapper_pg_dir