[PATCH v1 1/1] arm64: remove unnecessary ifdefs around is_compat_task()
From: Leonardo Bras <hidden>
Date: 2024-01-05 04:17:57
Also in:
lkml
Subsystem:
arm64 port (aarch64 architecture), ptrace support, the rest · Maintainers:
Catalin Marinas, Will Deacon, Oleg Nesterov, Linus Torvalds
Currently some parts of the codebase will test for CONFIG_COMPAT before testing is_compat_task(). is_compat_task() is a inlined function only present on CONFIG_COMPAT. On the other hand, for !CONFIG_COMPAT, we have in linux/compat.h: #define is_compat_task() (0) Since we have this define available in every usage of is_compat_task() for !CONFIG_COMPAT, it's unnecessary to keep the ifdefs, since the compiler is smart enough to optimize-out those snippets on CONFIG_COMPAT=n Signed-off-by: Leonardo Bras <redacted> --- Changes since RFCv1: - Removed unnecessary new inlined is_compat_task() for arm64 - Adjusted commit text and title Link: https://lore.kernel.org/all/20240104192433.109983-2-leobras@redhat.com/ (local) arch/arm64/kernel/ptrace.c | 6 ++---- arch/arm64/kernel/syscall.c | 5 +---- 2 files changed, 3 insertions(+), 8 deletions(-)
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 20d7ef82de90a..9f8781f1fdfda 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c@@ -173,7 +173,6 @@ static void ptrace_hbptriggered(struct perf_event *bp, struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); const char *desc = "Hardware breakpoint trap (ptrace)"; -#ifdef CONFIG_COMPAT if (is_compat_task()) { int si_errno = 0; int i;
@@ -195,7 +194,7 @@ static void ptrace_hbptriggered(struct perf_event *bp, desc); return; } -#endif + arm64_force_sig_fault(SIGTRAP, TRAP_HWBKPT, bkpt->trigger, desc); }
@@ -2112,7 +2111,6 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request, const struct user_regset_view *task_user_regset_view(struct task_struct *task) { -#ifdef CONFIG_COMPAT /* * Core dumping of 32-bit tasks or compat ptrace requests must use the * user_aarch32_view compatible with arm32. Native ptrace requests on
@@ -2123,7 +2121,7 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task) return &user_aarch32_view; else if (is_compat_thread(task_thread_info(task))) return &user_aarch32_ptrace_view; -#endif + return &user_aarch64_view; }
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c
index 9a70d9746b661..ad198262b9817 100644
--- a/arch/arm64/kernel/syscall.c
+++ b/arch/arm64/kernel/syscall.c@@ -20,14 +20,11 @@ long sys_ni_syscall(void); static long do_ni_syscall(struct pt_regs *regs, int scno) { -#ifdef CONFIG_COMPAT - long ret; if (is_compat_task()) { - ret = compat_arm_syscall(regs, scno); + long ret = compat_arm_syscall(regs, scno); if (ret != -ENOSYS) return ret; } -#endif return sys_ni_syscall(); }
--
2.43.0
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