forked from luck/tmp_suning_uos_patched
597d795a2a
In struct page we have enough space to fit long-size page->ptl there, but we use dynamically-allocated page->ptl if size(spinlock_t) is larger than sizeof(int). It hurts 64-bit architectures with CONFIG_GENERIC_LOCKBREAK, where sizeof(spinlock_t) == 8, but it easily fits into struct page. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
28 lines
773 B
C
28 lines
773 B
C
/*
|
|
* Generate definitions needed by the preprocessor.
|
|
* This code generates raw asm output which is post-processed
|
|
* to extract and format the required data.
|
|
*/
|
|
|
|
#define __GENERATING_BOUNDS_H
|
|
/* Include headers that define the enum constants of interest */
|
|
#include <linux/page-flags.h>
|
|
#include <linux/mmzone.h>
|
|
#include <linux/kbuild.h>
|
|
#include <linux/page_cgroup.h>
|
|
#include <linux/log2.h>
|
|
#include <linux/spinlock_types.h>
|
|
|
|
void foo(void)
|
|
{
|
|
/* The enum constants to put into include/generated/bounds.h */
|
|
DEFINE(NR_PAGEFLAGS, __NR_PAGEFLAGS);
|
|
DEFINE(MAX_NR_ZONES, __MAX_NR_ZONES);
|
|
DEFINE(NR_PCG_FLAGS, __NR_PCG_FLAGS);
|
|
#ifdef CONFIG_SMP
|
|
DEFINE(NR_CPUS_BITS, ilog2(CONFIG_NR_CPUS));
|
|
#endif
|
|
DEFINE(SPINLOCK_SIZE, sizeof(spinlock_t));
|
|
/* End of constants */
|
|
}
|