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Commit 1b8320b6 authored by Minchan Kim's avatar Minchan Kim Committed by Linus Torvalds
Browse files

zsmalloc: use bit_spin_lock 

Use kernel standard bit spin-lock instead of custom mess.  Even, it has
a bug which doesn't disable preemption.  The reason we don't have any
problem is that we have used it during preemption disable section by
class->lock spinlock.  So no need to go to stable.

Link: http://lkml.kernel.org/r/1464736881-24886-6-git-send-email-minchan@kernel.org


Signed-off-by: default avatarMinchan Kim <minchan@kernel.org>
Reviewed-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1fc6e27d

mm/zsmalloc.c

+3 −7
Original line number Diff line number Diff line
@@ -868,21 +868,17 @@ static unsigned long obj_idx_to_offset(struct page *page, 


static inline int trypin_tag(unsigned long handle)

{

	unsigned long *ptr = (unsigned long *)handle;



	return !test_and_set_bit_lock(HANDLE_PIN_BIT, ptr);

	return bit_spin_trylock(HANDLE_PIN_BIT, (unsigned long *)handle);

}



static void pin_tag(unsigned long handle)

{

	while (!trypin_tag(handle));

	bit_spin_lock(HANDLE_PIN_BIT, (unsigned long *)handle);

}



static void unpin_tag(unsigned long handle)

{

	unsigned long *ptr = (unsigned long *)handle;



	clear_bit_unlock(HANDLE_PIN_BIT, ptr);

	bit_spin_unlock(HANDLE_PIN_BIT, (unsigned long *)handle);

}



static void reset_page(struct page *page)