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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Thomas Gleixner:

 - Fix for a CPU hot-add deadlock in microcode update code

 - Fix for idle consolidation fallout

 - Documentation update for initial kernel direct mapping

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Add missing comments for initial kernel direct mapping
  x86/microcode: Add local mutex to fix physical CPU hot-add deadlock
  x86: Fix idle consolidation fallout
This commit is contained in:
Linus Torvalds 2013-05-15 14:07:53 -07:00
parent 652df602f8 cf8b166d5c
commit ae3b29e67c
3 changed files with 23 additions and 6 deletions
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5
arch/x86/kernel/microcode_intel_early.c
View File

@ -487,6 +487,7 @@ static inline void show_saved_mc(void)
#endif
#if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU)
static DEFINE_MUTEX(x86_cpu_microcode_mutex);
/*
* Save this mc into mc_saved_data. So it will be loaded early when a CPU is
* hot added or resumes.
@ -507,7 +508,7 @@ int save_mc_for_early(u8 *mc)
* Hold hotplug lock so mc_saved_data is not accessed by a CPU in
* hotplug.
*/
cpu_hotplug_driver_lock();
mutex_lock(&x86_cpu_microcode_mutex);
mc_saved_count_init = mc_saved_data.mc_saved_count;
mc_saved_count = mc_saved_data.mc_saved_count;
@ -544,7 +545,7 @@ int save_mc_for_early(u8 *mc)
}
out:
cpu_hotplug_driver_unlock();
mutex_unlock(&x86_cpu_microcode_mutex);
return ret;
}

5
arch/x86/kernel/process.c
View File

@ -312,6 +312,8 @@ void arch_cpu_idle(void)
{
if (cpuidle_idle_call())
x86_idle();
else
local_irq_enable();
}
/*
@ -368,9 +370,6 @@ void amd_e400_remove_cpu(int cpu)
*/
static void amd_e400_idle(void)
{
if (need_resched())
return;
if (!amd_e400_c1e_detected) {
u32 lo, hi;

19
arch/x86/mm/init.c
View File

@ -359,7 +359,17 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
}
/*
* would have hole in the middle or ends, and only ram parts will be mapped.
* We need to iterate through the E820 memory map and create direct mappings
* for only E820_RAM and E820_KERN_RESERVED regions. We cannot simply
* create direct mappings for all pfns from [0 to max_low_pfn) and
* [4GB to max_pfn) because of possible memory holes in high addresses
* that cannot be marked as UC by fixed/variable range MTRRs.
* Depending on the alignment of E820 ranges, this may possibly result
* in using smaller size (i.e. 4K instead of 2M or 1G) page tables.
*
* init_mem_mapping() calls init_range_memory_mapping() with big range.
* That range would have hole in the middle or ends, and only ram parts
* will be mapped in init_range_memory_mapping().
*/
static unsigned long __init init_range_memory_mapping(
unsigned long r_start,
@ -419,6 +429,13 @@ void __init init_mem_mapping(void)
max_pfn_mapped = 0; /* will get exact value next */
min_pfn_mapped = real_end >> PAGE_SHIFT;
last_start = start = real_end;
/*
* We start from the top (end of memory) and go to the bottom.
* The memblock_find_in_range() gets us a block of RAM from the
* end of RAM in [min_pfn_mapped, max_pfn_mapped) used as new pages
* for page table.
*/
while (last_start > ISA_END_ADDRESS) {
if (last_start > step_size) {
start = round_down(last_start - 1, step_size);