The patch titled
i386/kernel/smp.c: don't use set_irq_regs()
has been added to the -mm tree. Its filename is
i386-kernel-smpc-dont-use-set_irq_regs.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386/kernel/smp.c: don't use set_irq_regs()
From: Oleg Nesterov <oleg@xxxxxxxxxx>
We don't need to setup _irq_regs in smp_xxx_interrupt (except apic timer).
These handlers run with irqs disabled and do not call functions which need
"struct pt_regs".
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/smp.c | 6 ------
1 file changed, 6 deletions(-)
diff -puN arch/i386/kernel/smp.c~i386-kernel-smpc-dont-use-set_irq_regs arch/i386/kernel/smp.c
--- a/arch/i386/kernel/smp.c~i386-kernel-smpc-dont-use-set_irq_regs
+++ a/arch/i386/kernel/smp.c
@@ -321,7 +321,6 @@ static inline void leave_mm (unsigned lo
fastcall void smp_invalidate_interrupt(struct pt_regs *regs)
{
- struct pt_regs *old_regs = set_irq_regs(regs);
unsigned long cpu;
cpu = get_cpu();
@@ -352,7 +351,6 @@ fastcall void smp_invalidate_interrupt(s
smp_mb__after_clear_bit();
out:
put_cpu_no_resched();
- set_irq_regs(old_regs);
}
static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
@@ -607,14 +605,11 @@ void smp_send_stop(void)
*/
fastcall void smp_reschedule_interrupt(struct pt_regs *regs)
{
- struct pt_regs *old_regs = set_irq_regs(regs);
ack_APIC_irq();
- set_irq_regs(old_regs);
}
fastcall void smp_call_function_interrupt(struct pt_regs *regs)
{
- struct pt_regs *old_regs = set_irq_regs(regs);
void (*func) (void *info) = call_data->func;
void *info = call_data->info;
int wait = call_data->wait;
@@ -637,7 +632,6 @@ fastcall void smp_call_function_interrup
mb();
atomic_inc(&call_data->finished);
}
- set_irq_regs(old_regs);
}
/*
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
i386-kernel-smpc-dont-use-set_irq_regs.patch
taskstats_exit_alloc-optimize-simplify.patch
taskstats-cleanup-do_exit-path.patch
taskstats-cleanup-signal-stats-allocation.patch
taskstats-factor-out-reply-assembling.patch
taskstats-use-nla_reserve-for-reply-assembling.patch
taskstats-cleanup-reply-assembling.patch
doc-atomic_add_unless-doesnt-imply-mb-on-failure.patch
tty-signal-tty-locking.patch
do_task_stat-dont-take-tty_mutex.patch
do_acct_process-dont-take-tty_mutex.patch
trivial-make-set_special_pids-static.patch
sys_unshare-remove-a-broken-clone_sighand-code.patch
sys_setpgid-eliminate-unnecessary-do_each_task_pidpidtype_pgid.patch
session_of_pgrp-kill-unnecessary-do_each_task_pidpidtype_pgid.patch
pidhash-temporary-debug-checks.patch
-
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