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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-02-25 18:04:03 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-25 18:38:34 +0300 |
| commit | 34754b69a6f87aa6aa2860525a82f12532f83afd (patch) | |
| tree | 2f5234670238c3cf1139d09545fd25140f49c003 | |
| parent | 95108fa34a83ffd97e0af959e4b28d7c62008781 (diff) | |
| download | linux-34754b69a6f87aa6aa2860525a82f12532f83afd.tar.xz | |
x86: make vmap yell louder when it is used under irqs_disabled()
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/alternative.c | 6 | ||||
| -rw-r--r-- | mm/vmalloc.c | 3 |
2 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index a84ac7b570e6..6907b8e85d52 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -498,12 +498,12 @@ void *text_poke_early(void *addr, const void *opcode, size_t len) */ void *__kprobes text_poke(void *addr, const void *opcode, size_t len) { - unsigned long flags; char *vaddr; int nr_pages = 2; struct page *pages[2]; int i; + might_sleep(); if (!core_kernel_text((unsigned long)addr)) { pages[0] = vmalloc_to_page(addr); pages[1] = vmalloc_to_page(addr + PAGE_SIZE); @@ -517,9 +517,9 @@ void *__kprobes text_poke(void *addr, const void *opcode, size_t len) nr_pages = 1; vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL); BUG_ON(!vaddr); - local_irq_save(flags); + local_irq_disable(); memcpy(&vaddr[(unsigned long)addr & ~PAGE_MASK], opcode, len); - local_irq_restore(flags); + local_irq_enable(); vunmap(vaddr); sync_core(); /* Could also do a CLFLUSH here to speed up CPU recovery; but diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 4dd2636d0b92..f83a70167b99 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1257,6 +1257,7 @@ EXPORT_SYMBOL(vfree); void vunmap(const void *addr) { BUG_ON(in_interrupt()); + might_sleep(); __vunmap(addr, 0); } EXPORT_SYMBOL(vunmap); @@ -1276,6 +1277,8 @@ void *vmap(struct page **pages, unsigned int count, { struct vm_struct *area; + might_sleep(); + if (count > num_physpages) return NULL; |