[tip:x86/irq] x86/cpu_entry_area: Cleanup setup functions

tip-bot for Thomas Gleixner
2019-04-17T14:08:21Z

Commit-ID: 881a463cf21dbf83aab2cf6c9a359f34f88c2491
Gitweb: https://git.kernel.org/tip/881a463cf21dbf83aab2cf6c9a359f34f88c2491
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Sun, 14 Apr 2019 17:59:46 +0200
Committer: Borislav Petkov <bp@suse.de>
CommitDate: Wed, 17 Apr 2019 12:50:46 +0200

x86/cpu_entry_area: Cleanup setup functions

No point in retrieving the entry area pointer over and over. Do it once
and use unsigned int for 'cpu' everywhere.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160144.419653165@linutronix.de
---
arch/x86/mm/cpu_entry_area.c | 19 +++++++++----------
1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c
index 19c6abf9ea31..c2a54f75d335 100644
--- a/arch/x86/mm/cpu_entry_area.c
+++ b/arch/x86/mm/cpu_entry_area.c
@@ -52,10 +52,10 @@ cea_map_percpu_pages(void *cea_vaddr, void *ptr, int pages, pgprot_t prot)
cea_set_pte(cea_vaddr, per_cpu_ptr_to_phys(ptr), prot);
}

-static void __init percpu_setup_debug_store(int cpu)
+static void __init percpu_setup_debug_store(unsigned int cpu)
{
#ifdef CONFIG_CPU_SUP_INTEL
- int npages;
+ unsigned int npages;
void *cea;

if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
@@ -79,8 +79,9 @@ static void __init percpu_setup_debug_store(int cpu)
}

/* Setup the fixmap mappings only once per-processor */
-static void __init setup_cpu_entry_area(int cpu)
+static void __init setup_cpu_entry_area(unsigned int cpu)
{
+ struct cpu_entry_area *cea = get_cpu_entry_area(cpu);
#ifdef CONFIG_X86_64
/* On 64-bit systems, we use a read-only fixmap GDT and TSS. */
pgprot_t gdt_prot = PAGE_KERNEL_RO;
@@ -101,10 +102,9 @@ static void __init setup_cpu_entry_area(int cpu)
pgprot_t tss_prot = PAGE_KERNEL;
#endif

- cea_set_pte(&get_cpu_entry_area(cpu)->gdt, get_cpu_gdt_paddr(cpu),
- gdt_prot);
+ cea_set_pte(&cea->gdt, get_cpu_gdt_paddr(cpu), gdt_prot);

- cea_map_percpu_pages(&get_cpu_entry_area(cpu)->entry_stack_page,
+ cea_map_percpu_pages(&cea->entry_stack_page,
per_cpu_ptr(&entry_stack_storage, cpu), 1,
PAGE_KERNEL);

@@ -128,19 +128,18 @@ static void __init setup_cpu_entry_area(int cpu)
BUILD_BUG_ON((offsetof(struct tss_struct, x86_tss) ^
offsetofend(struct tss_struct, x86_tss)) & PAGE_MASK);
BUILD_BUG_ON(sizeof(struct tss_struct) % PAGE_SIZE != 0);
- cea_map_percpu_pages(&get_cpu_entry_area(cpu)->tss,
- &per_cpu(cpu_tss_rw, cpu),
+ cea_map_percpu_pages(&cea->tss, &per_cpu(cpu_tss_rw, cpu),
sizeof(struct tss_struct) / PAGE_SIZE, tss_prot);

#ifdef CONFIG_X86_32
- per_cpu(cpu_entry_area, cpu) = get_cpu_entry_area(cpu);
+ per_cpu(cpu_entry_area, cpu) = cea;
#endif

#ifdef CONFIG_X86_64
BUILD_BUG_ON(sizeof(exception_stacks) % PAGE_SIZE != 0);
BUILD_BUG_ON(sizeof(exception_stacks) !=
sizeof(((struct cpu_entry_area *)0)->exception_stacks));
- cea_map_percpu_pages(&get_cpu_entry_area(cpu)->exception_stacks,
+ cea_map_percpu_pages(&cea->exception_stacks,
&per_cpu(exception_stacks, cpu),
sizeof(exception_stacks) / PAGE_SIZE, PAGE_KERNEL);
#endif