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x86: don't define __this_fixmap_does_not_exist()

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Impact: improve out-of-range fixmap index debugging

Commit "1b42f51630c7eebce6fb780b480731eb81afd325"
defined the __this_fixmap_does_not_exist() function
with a WARN_ON(1) in it.

This causes the linker to not report an error when
__this_fixmap_does_not_exist() is called with a
non-constant parameter.

Ingo defined __this_fixmap_does_not_exist() because he
wanted to get virt addresses of fix memory of nest level
by non-constant index.

But we can fix this and still keep the link-time check:

We can get the four slot virt addresses on link time and
store them to array slot_virt[].

Then we can then refer the slot_virt with non-constant index,
in the ioremap-leak detection code.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
LKML-Reference: <49B2075B.4070509@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Wang Chen 2009-03-07 13:34:19 +08:00 committed by Ingo Molnar
parent 31bbed527e
commit 8827247ffc
1 changed files with 11 additions and 8 deletions
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19
arch/x86/mm/ioremap.c
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@ -504,13 +504,19 @@ static inline pte_t * __init early_ioremap_pte(unsigned long addr)
return &bm_pte[pte_index(addr)];
}
static unsigned long slot_virt[FIX_BTMAPS_SLOTS] __initdata;
void __init early_ioremap_init(void)
{
pmd_t *pmd;
int i;
if (early_ioremap_debug)
printk(KERN_INFO "early_ioremap_init()\n");
for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
slot_virt[i] = fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
memset(bm_pte, 0, sizeof(bm_pte));
pmd_populate_kernel(&init_mm, pmd, bm_pte);
@ -577,6 +583,7 @@ static inline void __init early_clear_fixmap(enum fixed_addresses idx)
static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata;
static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata;
static int __init check_early_ioremap_leak(void)
{
int count = 0;
@ -598,7 +605,8 @@ static int __init check_early_ioremap_leak(void)
}
late_initcall(check_early_ioremap_leak);
static void __init __iomem *__early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
static void __init __iomem *
__early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot)
{
unsigned long offset, last_addr;
unsigned int nrpages;
@ -664,9 +672,9 @@ static void __init __iomem *__early_ioremap(unsigned long phys_addr, unsigned lo
--nrpages;
}
if (early_ioremap_debug)
printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0));
printk(KERN_CONT "%08lx + %08lx\n", offset, slot_virt[slot]);
prev_map[slot] = (void __iomem *)(offset + fix_to_virt(idx0));
prev_map[slot] = (void __iomem *)(offset + slot_virt[slot]);
return prev_map[slot];
}
@ -734,8 +742,3 @@ void __init early_iounmap(void __iomem *addr, unsigned long size)
}
prev_map[slot] = NULL;
}
void __this_fixmap_does_not_exist(void)
{
WARN_ON(1);
}