From 291248fd6e371bcbfb8a77689c5d741a1527488f Mon Sep 17 00:00:00 2001 From: Karol Swietlicki Date: Mon, 4 Feb 2008 22:30:49 -0800 Subject: [PATCH] uml: remove unused variables in the context switcher This patch removes a variable which was not used in two functions. Yet another code cleanup, nothing really significant. Please note that I could not test this on x86_64. I don't have the hardware for it. [ jdike - Bits of tidying around the affected code. Also, it's fine on x86_64 ] Signed-off-by: Karol Swietlicki Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/process.c | 19 ++++++++----------- arch/um/sys-i386/ptrace.c | 6 +++--- arch/um/sys-i386/tls.c | 2 +- arch/um/sys-x86_64/syscalls.c | 2 +- 4 files changed, 13 insertions(+), 16 deletions(-) diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c index 91bd68eaba..62a4e0e12c 100644 --- a/arch/um/kernel/process.c +++ b/arch/um/kernel/process.c @@ -81,12 +81,12 @@ static inline void set_current(struct task_struct *task) { external_pid(task), task }); } -extern void arch_switch_to(struct task_struct *from, struct task_struct *to); +extern void arch_switch_to(struct task_struct *to); void *_switch_to(void *prev, void *next, void *last) { struct task_struct *from = prev; - struct task_struct *to= next; + struct task_struct *to = next; to->thread.prev_sched = from; set_current(to); @@ -94,16 +94,15 @@ void *_switch_to(void *prev, void *next, void *last) do { current->thread.saved_task = NULL; - switch_threads(&from->thread.switch_buf, - &to->thread.switch_buf); + switch_threads(&from->thread.switch_buf, &to->thread.switch_buf); - arch_switch_to(current->thread.prev_sched, current); + arch_switch_to(current); if (current->thread.saved_task) show_regs(&(current->thread.regs)); - next= current->thread.saved_task; - prev= current; - } while(current->thread.saved_task); + next = current->thread.saved_task; + prev = current; + } while (current->thread.saved_task); return current->thread.prev_sched; @@ -161,8 +160,6 @@ void new_thread_handler(void) void fork_handler(void) { force_flush_all(); - if (current->thread.prev_sched == NULL) - panic("blech"); schedule_tail(current->thread.prev_sched); @@ -171,7 +168,7 @@ void fork_handler(void) * arch_switch_to isn't needed. We could want to apply this to * improve performance. -bb */ - arch_switch_to(current->thread.prev_sched, current); + arch_switch_to(current); current->thread.prev_sched = NULL; diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c index bd3da8a61f..6b4499906a 100644 --- a/arch/um/sys-i386/ptrace.c +++ b/arch/um/sys-i386/ptrace.c @@ -8,11 +8,11 @@ #include "asm/uaccess.h" #include "skas.h" -extern int arch_switch_tls(struct task_struct *from, struct task_struct *to); +extern int arch_switch_tls(struct task_struct *to); -void arch_switch_to(struct task_struct *from, struct task_struct *to) +void arch_switch_to(struct task_struct *to) { - int err = arch_switch_tls(from, to); + int err = arch_switch_tls(to); if (!err) return; diff --git a/arch/um/sys-i386/tls.c b/arch/um/sys-i386/tls.c index 027e86ad9e..f29b8a8fc1 100644 --- a/arch/um/sys-i386/tls.c +++ b/arch/um/sys-i386/tls.c @@ -172,7 +172,7 @@ void clear_flushed_tls(struct task_struct *task) * SKAS patch. */ -int arch_switch_tls(struct task_struct *from, struct task_struct *to) +int arch_switch_tls(struct task_struct *to) { if (!host_supports_tls) return 0; diff --git a/arch/um/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c index 86f6b18410..e437ee2215 100644 --- a/arch/um/sys-x86_64/syscalls.c +++ b/arch/um/sys-x86_64/syscalls.c @@ -105,7 +105,7 @@ long sys_clone(unsigned long clone_flags, unsigned long newsp, return ret; } -void arch_switch_to(struct task_struct *from, struct task_struct *to) +void arch_switch_to(struct task_struct *to) { if ((to->thread.arch.fs == 0) || (to->mm == NULL)) return; -- 2.39.5