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xtensa: remove the get_order() implementation

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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: Yunsheng Lin <linyunsheng@huawei.com>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Link: https://patch.msgid.link/20241028115343.3405838-6-linyunsheng@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yunsheng Lin 2024-10-28 19:53:40 +08:00 committed by Jakub Kicinski
parent 3d18dfe69c
commit 49e302be73
1 changed files with 0 additions and 18 deletions
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18
arch/xtensa/include/asm/page.h
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@ -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);