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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-06-25 19:06:12 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-06-25 19:10:36 +0200 |
| commit | 7b0cfee1a24efdfe0235bac62e53f686fe8a8e24 (patch) | |
| tree | eeeb8cc3bf7be5ec0e54b7c4f3808ef88ecca012 /arch/x86/kernel/cpu/common.c | |
| parent | 9756fe38d10b2bf90c81dc4d2f17d5632e135364 (diff) | |
| parent | 6b16351acbd415e66ba16bf7d473ece1574cf0bc (diff) | |
Merge tag 'v3.5-rc4' into drm-intel-next-queued
I want to merge the "no more fake agp on gen6+" patches into
drm-intel-next (well, the last pieces). But a patch in 3.5-rc4 also
adds a new use of dev->agp. Hence the backmarge to sort this out, for
otherwise drm-intel-next merged into Linus' tree would conflict in the
relevant code, things would compile but nicely OOPS at driver load :(
Conflicts in this merge are just simple cases of "both branches
changed/added lines at the same place". The only tricky part is to
keep the order correct wrt the unwind code in case of errors in
intel_ringbuffer.c (and the MI_DISPLAY_FLIP #defines in i915_reg.h
together, obviously).
Conflicts:
drivers/gpu/drm/i915/i915_reg.h
drivers/gpu/drm/i915/intel_ringbuffer.c
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'arch/x86/kernel/cpu/common.c')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 82f29e70d058..6b9333b429ba 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1101,14 +1101,20 @@ int is_debug_stack(unsigned long addr) addr > (__get_cpu_var(debug_stack_addr) - DEBUG_STKSZ)); } +static DEFINE_PER_CPU(u32, debug_stack_use_ctr); + void debug_stack_set_zero(void) { + this_cpu_inc(debug_stack_use_ctr); load_idt((const struct desc_ptr *)&nmi_idt_descr); } void debug_stack_reset(void) { - load_idt((const struct desc_ptr *)&idt_descr); + if (WARN_ON(!this_cpu_read(debug_stack_use_ctr))) + return; + if (this_cpu_dec_return(debug_stack_use_ctr) == 0) + load_idt((const struct desc_ptr *)&idt_descr); } #else /* CONFIG_X86_64 */ |