diff options
| author | Jonathan Austin <Jonathan.Austin@arm.com> | 2012-08-23 15:02:59 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-08-25 10:20:40 +0200 |
| commit | 36418c516b31bff4ff949c7c618430a1a514debe (patch) | |
| tree | a17ddc5786e7761e0e9bd1668a4e4a6e4b48c8c0 /arch | |
| parent | ARM: 7503/1: mm: only flush both pmd entries for classic MMU (diff) | |
| download | linux-36418c516b31bff4ff949c7c618430a1a514debe.tar.xz linux-36418c516b31bff4ff949c7c618430a1a514debe.zip | |
ARM: 7499/1: mm: Fix vmalloc overlap check for !HIGHMEM
With !HIGHMEM, sanity_check_meminfo checks for banks that completely or
partially overlap the vmalloc region. The test for partial overlap checks
__va(bank->start + bank->size) > vmalloc_min. This is not appropriate if
there is a non-linear translation between virtual and physical addresses,
as bank->start + bank->size is actually in the bank following the one being
interrogated.
In most cases, even when using SPARSEMEM, this is not problematic as the
subsequent bank will start at a higher va than the one in question. However
if the physical to virtual address conversion is not monotonic increasing,
the incorrect test could result in a bank not being truncated when it
should be.
This patch ensures we perform the va-pa conversion on memory from the
bank we are interested in, not the following one.
Reported-by: ??? (Steve) <zhanzhenbo@gmail.com>
Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/mmu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index eab94bc6f805..c2fa21d0103e 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -961,8 +961,8 @@ void __init sanity_check_meminfo(void) * Check whether this memory bank would partially overlap * the vmalloc area. */ - if (__va(bank->start + bank->size) > vmalloc_min || - __va(bank->start + bank->size) < __va(bank->start)) { + if (__va(bank->start + bank->size - 1) >= vmalloc_min || + __va(bank->start + bank->size - 1) <= __va(bank->start)) { unsigned long newsize = vmalloc_min - __va(bank->start); printk(KERN_NOTICE "Truncating RAM at %.8llx-%.8llx " "to -%.8llx (vmalloc region overlap).\n", |