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powerpc/mm: Leave a gap between early allocated IO areas

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Vmalloc system leaves a gap between allocated areas. It helps catching
overflows.

Do the same for IO areas which are allocated with early_ioremap_range()
until slab_is_available().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c433e358190fb5d47650463ea1ab755fc7b73e6e.1618828806.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-04-19 10:47:26 +00:00 committed by Michael Ellerman
parent 0e8554b5d7
commit 57307f1b6e
2 changed files with 3 additions and 3 deletions
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4
arch/powerpc/mm/ioremap_32.c
View file

@ -70,10 +70,10 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, pgprot_t prot, void *call
*/
pr_warn("ioremap() called early from %pS. Use early_ioremap() instead\n", caller);
err = early_ioremap_range(ioremap_bot - size, p, size, prot);
err = early_ioremap_range(ioremap_bot - size - PAGE_SIZE, p, size, prot);
if (err)
return NULL;
ioremap_bot -= size;
ioremap_bot -= size + PAGE_SIZE;
return (void __iomem *)ioremap_bot + offset;
}

2
arch/powerpc/mm/ioremap_64.c
View file

@ -38,7 +38,7 @@ void __iomem *__ioremap_caller(phys_addr_t addr, unsigned long size,
return NULL;
ret = (void __iomem *)ioremap_bot + offset;
ioremap_bot += size;
ioremap_bot += size + PAGE_SIZE;
return ret;
}