From 05161b9cbe553c41cf775ac41bb5120d94347e5c Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 28 Aug 2017 08:47:18 +0200 Subject: [PATCH] x86/irq: Get rid of the 'first_system_vector' indirection bogosity This variable is beyond pointless. Nothing allocates a vector via alloc_gate() below FIRST_SYSTEM_VECTOR. So nothing can change first_system_vector. If there is a need for a gate below FIRST_SYSTEM_VECTOR then it can be added to the vector defines and FIRST_SYSTEM_VECTOR can be adjusted accordingly. Signed-off-by: Thomas Gleixner Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Steven Rostedt Link: http://lkml.kernel.org/r/20170828064956.357109735@linutronix.de Signed-off-by: Ingo Molnar --- arch/x86/include/asm/desc.h | 5 ++--- arch/x86/kernel/apic/apic.c | 2 -- arch/x86/kernel/apic/vector.c | 2 +- arch/x86/kernel/irq.c | 2 +- arch/x86/kernel/irqinit.c | 5 +---- 5 files changed, 5 insertions(+), 11 deletions(-) diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h index d0a21b12dd58..a7f36ab1c07d 100644 --- a/arch/x86/include/asm/desc.h +++ b/arch/x86/include/asm/desc.h @@ -5,6 +5,7 @@ #include #include #include +#include #include #include @@ -482,16 +483,14 @@ static inline void _set_gate(int gate, unsigned type, void *addr, 0, 0, __KERNEL_CS); \ } while (0) -extern int first_system_vector; /* used_vectors is BITMAP for irq is not managed by percpu vector_irq */ extern unsigned long used_vectors[]; static inline void alloc_system_vector(int vector) { + BUG_ON(vector < FIRST_SYSTEM_VECTOR); if (!test_bit(vector, used_vectors)) { set_bit(vector, used_vectors); - if (first_system_vector > vector) - first_system_vector = vector; } else { BUG(); } diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 98b3dd8cf2bf..8996ef1eb39f 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -177,8 +177,6 @@ static int disable_apic_timer __initdata; int local_apic_timer_c2_ok; EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); -int first_system_vector = FIRST_SYSTEM_VECTOR; - /* * Debug level, exported for io_apic.c */ diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index b3af457ed667..88c214e75a6b 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -166,7 +166,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, offset = current_offset; next: vector += 16; - if (vector >= first_system_vector) { + if (vector >= FIRST_SYSTEM_VECTOR) { offset = (offset + 1) % 16; vector = FIRST_EXTERNAL_VECTOR + offset; } diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index e6073a0ce77e..019d0ac8ed3a 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -429,7 +429,7 @@ int check_irq_vectors_for_cpu_disable(void) * this w/o holding vector_lock. */ for (vector = FIRST_EXTERNAL_VECTOR; - vector < first_system_vector; vector++) { + vector < FIRST_SYSTEM_VECTOR; vector++) { if (!test_bit(vector, used_vectors) && IS_ERR_OR_NULL(per_cpu(vector_irq, cpu)[vector])) { if (++count == this_count) diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c index 6537cfe2cb1d..4e5f8c022fdd 100644 --- a/arch/x86/kernel/irqinit.c +++ b/arch/x86/kernel/irqinit.c @@ -169,10 +169,7 @@ void __init native_init_IRQ(void) * 'special' SMP interrupts) */ i = FIRST_EXTERNAL_VECTOR; -#ifndef CONFIG_X86_LOCAL_APIC -#define first_system_vector NR_VECTORS -#endif - for_each_clear_bit_from(i, used_vectors, first_system_vector) { + for_each_clear_bit_from(i, used_vectors, FIRST_SYSTEM_VECTOR) { /* IA32_SYSCALL_VECTOR could be used in trap_init already. */ set_intr_gate(i, irq_entries_start + 8 * (i - FIRST_EXTERNAL_VECTOR)); -- 2.20.1