This is a note to let you know that I've just added the patch titled
parisc: optimize mtsp(0,sr) inline assembly
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
parisc-optimize-mtsp-0-sr-inline-assembly.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 92b59929825d67db575043a76651865d16873b36 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Sat, 29 Jun 2013 22:08:03 +0200
Subject: parisc: optimize mtsp(0,sr) inline assembly
From: Helge Deller <deller@xxxxxx>
commit 92b59929825d67db575043a76651865d16873b36 upstream.
If the value which should be moved into a space register is zero, we can
optimize the inline assembly to become "mtsp %r0,%srX".
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/include/asm/special_insns.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/arch/parisc/include/asm/special_insns.h
+++ b/arch/parisc/include/asm/special_insns.h
@@ -32,9 +32,12 @@ static inline void set_eiem(unsigned lon
cr; \
})
-#define mtsp(gr, cr) \
- __asm__ __volatile__("mtsp %0,%1" \
+#define mtsp(val, cr) \
+ { if (__builtin_constant_p(val) && ((val) == 0)) \
+ __asm__ __volatile__("mtsp %%r0,%0" : : "i" (cr) : "memory"); \
+ else \
+ __asm__ __volatile__("mtsp %0,%1" \
: /* no outputs */ \
- : "r" (gr), "i" (cr) : "memory")
+ : "r" (val), "i" (cr) : "memory"); }
#endif /* __PARISC_SPECIAL_INSNS_H */
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-3.10/parisc-fix-lmmio-mismatch-between-pat-length-and-mask-register.patch
queue-3.10/parisc-document-the-shadow-registers.patch
queue-3.10/parisc-optimize-mtsp-0-sr-inline-assembly.patch
queue-3.10/parisc-ensure-volatile-space-register-sr1-is-not-clobbered.patch
queue-3.10/parisc-fix-gcc-miscompilation-in-pa_memcpy.patch
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