Messages in this thread Patch in this message | | | Date | Mon, 16 Dec 2013 01:04:13 -0800 (PST) | From | Hugh Dickins <> | Subject | mm: ptl is not bloated if it fits in pointer |
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It's silly to force the 64-bit CONFIG_GENERIC_LOCKBREAK architectures to kmalloc eight bytes for an indirect page table lock: the lock needs to fit in the space that a pointer to it would occupy, not into an int.
Signed-off-by: Hugh Dickins <hughd@google.com> ---
kernel/bounds.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- 3.13-rc4/kernel/bounds.c 2013-11-22 15:40:37.452192638 -0800 +++ linux/kernel/bounds.c 2013-12-15 14:34:36.304485959 -0800 @@ -22,6 +22,6 @@ void foo(void) #ifdef CONFIG_SMP DEFINE(NR_CPUS_BITS, ilog2(CONFIG_NR_CPUS)); #endif - DEFINE(BLOATED_SPINLOCKS, sizeof(spinlock_t) > sizeof(int)); + DEFINE(BLOATED_SPINLOCKS, sizeof(spinlock_t) > sizeof(spinlock_t *)); /* End of constants */ }
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