Commit 49e302be authored by Yunsheng Lin's avatar Yunsheng Lin Committed by Jakub Kicinski
Browse files

xtensa: remove the get_order() implementation 



As the get_order() implemented by xtensa supporting 'nsau'
instruction seems be the same as the generic implementation
in include/asm-generic/getorder.h when size is not a constant
value as the generic implementation calling the fls*() is also
utilizing the 'nsau' instruction for xtensa.

So remove the get_order() implemented by xtensa, as using the
generic implementation may enable the compiler to do the
computing when size is a constant value instead of runtime
computing and enable the using of get_order() in BUILD_BUG_ON()
macro in next patch.

CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux-MM <linux-mm@kvack.org>
Signed-off-by: default avatarYunsheng Lin <linyunsheng@huawei.com>
Acked-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
Reviewed-by: default avatarAlexander Duyck <alexanderduyck@fb.com>
Link: https://patch.msgid.link/20241028115343.3405838-6-linyunsheng@huawei.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 3d18dfe6

arch/xtensa/include/asm/page.h

+0 −18
Original line number Diff line number Diff line
@@ -109,26 +109,8 @@ typedef struct page *pgtable_t; 
#define __pgd(x)	((pgd_t) { (x) } )

#define __pgprot(x)	((pgprot_t) { (x) } )



/*

 * Pure 2^n version of get_order

 * Use 'nsau' instructions if supported by the processor or the generic version.

 */



#if XCHAL_HAVE_NSA



static inline __attribute_const__ int get_order(unsigned long size)

{

	int lz;

	asm ("nsau %0, %1" : "=r" (lz) : "r" ((size - 1) >> PAGE_SHIFT));

	return 32 - lz;

}



#else



# include <asm-generic/getorder.h>



#endif



struct page;

struct vm_area_struct;

extern void clear_page(void *page);