diff options
| author | James Hogan <james.hogan@imgtec.com> | 2017-02-10 22:44:03 +0000 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2017-02-13 18:57:34 +0000 |
| commit | 4828b5f56f9596f014567ceef0e5c200fb582e13 (patch) | |
| tree | 4dcad3dc8b9382b4fea9f9cdcaf53c5890822de9 /arch/mips/kernel/cacheinfo.c | |
| parent | f229454d34e000e714280e767811304e29d96bea (diff) | |
MIPS: Fix cacheinfo overflow
The recently added MIPS cacheinfo support used a macro populate_cache()
to populate the cacheinfo structures depending on which caches are
present. However the macro contains multiple statements without
enclosing them in a do {} while (0) loop, so the L2 and L3 cache
conditionals in populate_cache_leaves() only conditionalised the first
statement in the macro.
This overflows the buffer allocated by detect_cache_attributes(),
resulting in boot failures under QEMU where neither the L2 or L2 caches
are present.
Enclose the macro statements in a do {} while (0) block to keep the
whole macro inside the conditionals.
Fixes: ef462f3b64e9 ("MIPS: Add cacheinfo support")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Justin Chen <justin.chen@broadcom.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: bcm-kernel-feedback-list@broadcom.com
Patchwork: https://patchwork.linux-mips.org/patch/15276/
Diffstat (limited to 'arch/mips/kernel/cacheinfo.c')
| -rw-r--r-- | arch/mips/kernel/cacheinfo.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/mips/kernel/cacheinfo.c b/arch/mips/kernel/cacheinfo.c index a92bbbae969b..97d5239ca47b 100644 --- a/arch/mips/kernel/cacheinfo.c +++ b/arch/mips/kernel/cacheinfo.c @@ -17,6 +17,7 @@ /* Populates leaf and increments to next leaf */ #define populate_cache(cache, leaf, c_level, c_type) \ +do { \ leaf->type = c_type; \ leaf->level = c_level; \ leaf->coherency_line_size = c->cache.linesz; \ @@ -24,7 +25,8 @@ leaf->ways_of_associativity = c->cache.ways; \ leaf->size = c->cache.linesz * c->cache.sets * \ c->cache.ways; \ - leaf++; + leaf++; \ +} while (0) static int __init_cache_level(unsigned int cpu) { |