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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-07-12 15:44:14 +0100
committerWill Deacon <will.deacon@arm.com>2017-07-25 10:04:42 +0100
commit288be97cc74e31b7871c75eb11a8dd768dcb535d (patch)
treec2e64b697b8e1196a8b3e15b625e072de1d21636 /arch/arm64/lib
parentece4b206be9934b3bb32adb1261545ead831c993 (diff)
downloadlinux-288be97cc74e31b7871c75eb11a8dd768dcb535d.tar.bz2
arm64/lib: copy_page: use consistent prefetch stride
The optional prefetch instructions in the copy_page() routine are inconsistent: at the start of the function, two cachelines are prefetched beyond the one being loaded in the first iteration, but in the loop, the prefetch is one more line ahead. This appears to be unintentional, so let's fix it. While at it, fix the comment style and white space. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/lib')
-rw-r--r--arch/arm64/lib/copy_page.S9
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S
index c3cd65e31814..076c43715e64 100644
--- a/arch/arm64/lib/copy_page.S
+++ b/arch/arm64/lib/copy_page.S
@@ -30,9 +30,10 @@
*/
ENTRY(copy_page)
alternative_if ARM64_HAS_NO_HW_PREFETCH
- # Prefetch two cache lines ahead.
- prfm pldl1strm, [x1, #128]
- prfm pldl1strm, [x1, #256]
+ // Prefetch three cache lines ahead.
+ prfm pldl1strm, [x1, #128]
+ prfm pldl1strm, [x1, #256]
+ prfm pldl1strm, [x1, #384]
alternative_else_nop_endif
ldp x2, x3, [x1]
@@ -50,7 +51,7 @@ alternative_else_nop_endif
subs x18, x18, #128
alternative_if ARM64_HAS_NO_HW_PREFETCH
- prfm pldl1strm, [x1, #384]
+ prfm pldl1strm, [x1, #384]
alternative_else_nop_endif
stnp x2, x3, [x0]