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x86: add debug warnings to early_ioremap()

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Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-01-30 13:33:45 +01:00
parent a8efa1cd51
commit bd796ed023
1 changed files with 13 additions and 6 deletions
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19
arch/x86/mm/ioremap_32.c
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@ -306,12 +306,15 @@ void __init *early_ioremap(unsigned long phys_addr, unsigned long size)
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
if (!size || last_addr < phys_addr)
if (!size || last_addr < phys_addr) {
WARN_ON(1);
return NULL;
}
if (nesting >= FIX_BTMAPS_NESTING)
if (nesting >= FIX_BTMAPS_NESTING) {
WARN_ON(1);
return NULL;
}
early_ioremap_nested++;
/*
* Mappings have to be page-aligned
@ -324,8 +327,10 @@ void __init *early_ioremap(unsigned long phys_addr, unsigned long size)
* Mappings have to fit in the FIX_BTMAP area.
*/
nrpages = size >> PAGE_SHIFT;
if (nrpages > NR_FIX_BTMAPS)
if (nrpages > NR_FIX_BTMAPS) {
WARN_ON(1);
return NULL;
}
/*
* Ok, go for it..
@ -351,11 +356,13 @@ void __init early_iounmap(void *addr, unsigned long size)
unsigned int nesting;
nesting = --early_ioremap_nested;
WARN_ON(nesting < 0);
virt_addr = (unsigned long)addr;
if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN))
if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) {
WARN_ON(1);
return;
}
offset = virt_addr & ~PAGE_MASK;
nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT;