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@xxxxxxxxxx>
---
arch/powerpc/mm/ioremap_32.c | 4 ++--
arch/powerpc/mm/ioremap_64.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/mm/ioremap_32.c b/arch/powerpc/mm/ioremap_32.c
index 743e11384dea..9d13143b8be4 100644
--- a/arch/powerpc/mm/ioremap_32.c
+++ b/arch/powerpc/mm/ioremap_32.c
@@ -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;
}
diff --git a/arch/powerpc/mm/ioremap_64.c b/arch/powerpc/mm/ioremap_64.c
index ba5cbb0d66bd..3acece00b33e 100644
--- a/arch/powerpc/mm/ioremap_64.c
+++ b/arch/powerpc/mm/ioremap_64.c
@@ -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;
}
--
2.25.0
