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Commit bd796ed0 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: add debug warnings to early_ioremap() 



Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent a8efa1cd

arch/x86/mm/ioremap_32.c

+13 −6
Original line number Diff line number Diff line
@@ -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;