xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[SPARC64]: Inline membar()'s again.

Browse Source 
Since GCC has to emit a call and a delay slot to the
out-of-line "membar" routines in arch/sparc64/lib/mb.S
it is much better to just do the necessary predicted
branch inline instead as:

	ba,pt	%xcc, 1f
	 membar	#whatever
1:

instead of the current:

	call	membar_foo
	 dslot

because this way GCC is not required to allocate a stack
frame if the function can be a leaf function.

This also makes this bug fix easier to backport to 2.4.x

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2005-09-08 14:37:53 -07:00
parent 1b11d78cf8
commit 4d803fcdcd
4 changed files with 43 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
arch/sparc64/kernel/sparc64_ksyms.c
View File

@@ -403,12 +403,3 @@ EXPORT_SYMBOL(xor_vis_4);
EXPORT_SYMBOL(xor_vis_5);
EXPORT_SYMBOL(prom_palette);
/* memory barriers */
EXPORT_SYMBOL(mb);
EXPORT_SYMBOL(rmb);
EXPORT_SYMBOL(wmb);
EXPORT_SYMBOL(membar_storeload);
EXPORT_SYMBOL(membar_storeload_storestore);
EXPORT_SYMBOL(membar_storeload_loadload);
EXPORT_SYMBOL(membar_storestore_loadstore);