Hi all,
in arch/*/mm/ioremap.c, __ioremap() of several platforms there seems to
be a minor mistake in the calculation of the page-aligned mapping size:
void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
{
void * addr;
struct vm_struct * area;
unsigned long offset, last_addr;
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
if (!size || last_addr < phys_addr)
return NULL;
/* ... code which doesn't change last_addr ... */
size = PAGE_ALIGN(last_addr) - phys_addr;
/* ... */
}
For this calculation to work, PAGE_ALIGN(last_addr) would have to be
the address immediately after the last address to be mapped - if
last_addr is the first address of a page however, PAGE_ALIGN() of course
"returns" it unchanged.
So, the correct version IMO should look like this:
size = PAGE_ALIGN(last_addr + 1) - phys_addr;
(2.5.47?/)i386 even seems to be affected twice - bt_ioremap() contains the
same piece of code.
In the hope not to have overlooked something,
Florian
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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:33 EST