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arm64: lib: Annotate {clear, copy}_page() as position-independent

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[ Upstream commit 8d9902055c57548bb342dc3ca78caa21e9643024 ]

clear_page() and copy_page() are suitable for use outside of the kernel
address space, so annotate them as position-independent code.

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210319100146.1149909-2-qperret@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Will Deacon
2021-03-19 10:01:09 +00:00
committed by Greg Kroah-Hartman
parent 69e402a985
commit 88ed31aab4
2 changed files with 4 additions and 4 deletions
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4
arch/arm64/lib/clear_page.S
View File

@@ -14,7 +14,7 @@
* Parameters: * Parameters:
* x0 - dest * x0 - dest
*/ */
SYM_FUNC_START(clear_page) SYM_FUNC_START_PI(clear_page)
mrs x1, dczid_el0 mrs x1, dczid_el0
and w1, w1, #0xf and w1, w1, #0xf
mov x2, #4 mov x2, #4
@@ -25,5 +25,5 @@ SYM_FUNC_START(clear_page)
tst x0, #(PAGE_SIZE - 1) tst x0, #(PAGE_SIZE - 1)
b.ne 1b b.ne 1b
ret ret
SYM_FUNC_END(clear_page) SYM_FUNC_END_PI(clear_page)
EXPORT_SYMBOL(clear_page) EXPORT_SYMBOL(clear_page)

4
arch/arm64/lib/copy_page.S
View File

@@ -17,7 +17,7 @@
* x0 - dest * x0 - dest
* x1 - src * x1 - src
*/ */
SYM_FUNC_START(copy_page) SYM_FUNC_START_PI(copy_page)
alternative_if ARM64_HAS_NO_HW_PREFETCH alternative_if ARM64_HAS_NO_HW_PREFETCH
// Prefetch three cache lines ahead. // Prefetch three cache lines ahead.
prfm pldl1strm, [x1, #128] prfm pldl1strm, [x1, #128]
@@ -75,5 +75,5 @@ alternative_else_nop_endif
stnp x16, x17, [x0, #112 - 256] stnp x16, x17, [x0, #112 - 256]
ret ret
SYM_FUNC_END(copy_page) SYM_FUNC_END_PI(copy_page)
EXPORT_SYMBOL(copy_page) EXPORT_SYMBOL(copy_page)